GPS Pathfinder ProXRT Receiver User Guide

GPS Pathfinder ProXRT Receiver User Guide
USER GUIDE
GPS Pathfinder® ProXRT
receiver
USER GUIDE
GPS Pathfinder® ProXRT
receiver
Version 1.00
Revision B
June 2009
F
Trimble Navigation Limited
10355 Westmoor Drive
Suite #100
Westminster, CO 80021
USA
www.trimble.com
Australia and New Zealand
This product conforms with the regulatory requirements of
the Australian Communications Authority (ACA) EMC
framework, thus satisfying the requirements for C-Tick
Marking and sale within Australia and New Zealand.
Legal Notices
© 2009, Trimble Navigation Limited. All rights reserved.
Trimble, the Globe & Triangle logo, and GPS Pathfinder are
trademarks of Trimble Navigation Limited, registered in the United
States Patent and Trademark Office and in other countries.
GeoBeacon, GPScorrect, H-Star, Nomad, TerraSync, VRS, and
Zephyr are trademarks of Trimble Navigation Limited.
Microsoft, Windows, Windows Mobile, Windows NT, Windows
Vista, and Internet Explorer are either registered trademarks or
trademarks of Microsoft Corporation in the United States and/or
other countries.
The Bluetooth word mark and logos are owned by the Bluetooth
SIG, Inc. and any use of such marks by Trimble Navigation Limited
is under license.
All other trademarks are the property of their respective owners.
Taiwan – Battery Recycling Requirements
The product contains a removable Lithium-ion battery.
Taiwanese regulations require that waste batteries are
recycled.
Release Notice
This is the June 2009 release (Revision B) of the GPS Pathfinder
ProXRT Receiver User Guide. It applies to version 3.60 and later of the
receiver firmware.
Product Limited Warranty Information
For applicable product Limited Warranty information, please refer
to the Limited Warranty Card included with this Trimble product,
or consult your local Trimble authorized dealer.
Notices
Class B Statement – Notice to Users. This equipment has been
tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC rules and Part 90. These
limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment
generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause
harmful interference to radio communication. However, there is no
guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning
the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the equipment and the receiver.
– Connect the equipment into an outlet on a circuit different from
that to which the receiver is connected.
– Consult the dealer or an experienced radio/TV technician for
help.
Changes and modifications not expressly approved by the
manufacturer or registrant of this equipment can void your
authority to operate this equipment under Federal
Communications Commission rules.
Canada
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme
NMB-003 du Canada.
This apparatus complies with Canadian RSS-GEN, RSS-310,
RSS-210, and RSS-119.
Cet appareil est conforme à la norme CNR-GEN, CNR-310,
CNR-210, et CNR-119 du Canada.
Europe
This product (the GPS Pathfinder ProXRT receiver) is
intended to be used in all EU member countries, Norway,
and Switzerland.
This product has been tested and found to comply with the
requirements for a Class B device pursuant to European Council
Directive 89/336/EEC on EMC, thereby satisfying the requirements
for CE Marking and sale within the European Economic Area (EEA).
Contains Bluetooth radio module PBA 31308. These requirements
are designed to provide reasonable protection against harmful
interference when the equipment is operated in a residential or
commercial environment.
2 GPS Pathfinder ProXRT Receiver User Guide
廢電池請回收
Notice to Our European Union Customers
Directive 1999/5/EC
Hereby, Trimble Navigation, declares that the GPS Pathfinder
ProXRT receiver is in compliance with the essential requirements
and other relevant provisions of Directive 1999/5/EC.
Restriction of Use of Certain Hazardous Substances
in Electrical and Electronic Equipment (RoHS)
This Trimble product complies in all material respects with
DIRECTIVE 2002/95/EC OF THE EUROPEAN PARLIAMENT AND
OF THE COUNCIL of 27 January 2003 on the restriction of the use of
certain hazardous substances in electrical and electronic
equipment (RoHS Directive) and Amendment 2005/618/EC filed
under C(2005) 3143, with exemptions for lead in solder pursuant to
Paragraph 7 of the Annex to the RoHS Directive applied.
For China RoHS information, see Appendix B, China RoHS
Information on page 91.
Waste Electrical and Electronic Equipment (WEEE)
For product recycling instructions and more information, please go
to www.trimble.com/ev.shtml.
Recycling in Europe: To recycle Trimble WEEE (Waste
Electrical and Electronic Equipment, products that run on
electrical power.), Call +31 497 53 24 30, and ask for the
"WEEE Associate". Or, mail a request for recycling
instructions to:
Trimble Europe BV
c/o Menlo Worldwide Logistics
Meerheide 45
5521 DZ Eersel, NL
Declaration of Conformity
We, Trimble Navigation Limited,
935 Stewart Drive
PO Box 3642
Sunnyvale, CA 94088-3642
United States
+1-408-481-8000
declare under sole responsibility that the products:
GPS Pathfinder ProXRT receiver
comply with Part 15 of FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including
interference that may cause undesired operation.
Safety Information
Before you use the Trimble® GPS Pathfinder® ProXRT receiver, make sure that you
have read and understood all safety requirements.
Regulations and safety
The receiver contains an internal Bluetooth® radio and can send signals through
Bluetooth wireless technology. Bluetooth radios operate in license-free bands.
Before operating a GPS Pathfinder ProXRT receiver, determine if authorization or a
license to operate the unit is required in your country. It is the responsibility of the end
user to obtain an operator’s permit or license for the receiver for the location or
country of use.
For FCC regulations, see Notices, page 2.
Type approval
Type approval, or acceptance, covers technical parameters of the equipment related to
emissions that can cause interference. Type approval is granted to the manufacturer of
the transmission equipment, independent from the operation or licensing of the units.
Some countries have unique technical requirements for operation in particular
radio-modem frequency bands. To comply with those requirements, Trimble may have
modified your equipment to be granted Type approval. Unauthorized modification of
the units voids the Type approval, the warranty, and the operational license of the
equipment.
Exposure to radio frequency radiation
The radiated output power of the internal Bluetooth wireless radio is far below the
FCC radio frequency exposure limits. Nevertheless, the wireless radio should be used in
such a manner that the Trimble receiver is 20 cm or further from the human body. The
internal wireless radio operates within guidelines found in radio frequency safety
standards and recommendations, which reflect the consensus of the scientific
community. Trimble therefore believes that the internal wireless radio is safe for use.
The level of energy emitted is far less than the electromagnetic energy emitted by
wireless devices such as cellular phones. However, the use of wireless radios may be
restricted in some situations or environments, such as on aircraft. If you are unsure of
restrictions, you are encouraged to ask for authorization before turning on the wireless
radio.
GPS Pathfinder ProXRT Receiver User Guide
3
Safety Information
AC adaptor safety
C
WARNING – To use AC adaptors safely:
– Use only the AC adaptor intended for the GPS Pathfinder ProXRT receiver. Using any
other AC adaptor can damage the receiver and may void your warranty. Do not use
the AC adaptor with any other product.
– Make certain that the input voltage on the adaptor matches the voltage and frequency
in your location.
– Make certain that the adaptor has prongs compatible with your outlets.
– Do not use the AC adaptor in wet outdoor areas; it is designed for indoor use only.
– Unplug the AC adaptor from power when not in use.
– Do not short the output connector.
– Be aware that there are no user-serviceable parts in this product.
– If the AC adaptor becomes damaged, replace it with a new Trimble AC adaptor.
Battery safety
4
C
WARNING – Do not damage the rechargeable Lithium-ion battery. A damaged battery
can cause an explosion or fire, and can result in personal injury and/or property damage.
To prevent injury or damage:
– Do not use or charge the battery if it appears to be damaged. Signs of damage include,
but are not limited to, discoloration, warping, and leaking battery fluid.
– Do not expose the battery to fire, high temperature, or direct sunlight.
– Do not immerse the battery in water.
– Do not use or store the battery inside a vehicle during hot weather.
– Do not drop or puncture the battery.
– Do not open the battery or short-circuit its contacts.
C
WARNING – Avoid contact with the rechargeable Lithium-ion battery if it appears to be
leaking. Battery fluid is corrosive, and contact with it can result in personal injury and/or
property damage.
To prevent injury or damage:
– If the battery leaks, avoid contact with the battery fluid.
– If battery fluid gets into your eyes, immediately rinse your eyes with clean water and
seek medical attention. Do not rub your eyes!
– If battery fluid gets onto your skin or clothing, immediately use clean water to wash off
the battery fluid.
C
WARNING – Charge and use the rechargeable Lithium-ion battery only in strict
accordance with the instructions. Charging or using the battery in unauthorized
equipment can cause an explosion or fire, and can result in personal injury and/or
equipment damage.
To prevent injury or damage:
– Do not charge or use the battery if it appears to be damaged or leaking.
– Charge the Lithium-ion battery only in a Trimble product that is specified to charge it.
Be sure to follow all instructions that are provided with the battery charger.
– Discontinue charging a battery that gives off extreme heat or a burning odor.
– Use the battery only in Trimble equipment that is specified to use it.
– Use the battery only for its intended use and according to the instructions in the product
documentation.
GPS Pathfinder ProXRT Receiver User Guide
Contents
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Regulations and safety . . . . . . . . . . .
Type approval . . . . . . . . . . . . . . . .
Exposure to radio frequency radiation .
AC adaptor safety . . . . . . . . . . . . . .
Battery safety. . . . . . . . . . . . . . . . .
1
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10
11
12
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13
Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Batteries and power . . . . . . . . . . . . . . . . . . . . . .
External power . . . . . . . . . . . . . . . . . . . . .
Battery safety . . . . . . . . . . . . . . . . . . . . . .
Battery performance. . . . . . . . . . . . . . . . . .
Charging the Lithium-ion battery . . . . . . . . .
Storing the Lithium-ion battery . . . . . . . . . . .
Removing the rechargeable Lithium-ion battery
Keypad and display . . . . . . . . . . . . . . . . . . . . . . .
Button functions . . . . . . . . . . . . . . . . . . . .
Home screen. . . . . . . . . . . . . . . . . . . . . . .
Status screens . . . . . . . . . . . . . . . . . . . . . .
Rear connectors . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver operation overview . . . . . . . . . . . . . . . . .
3
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Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
About the GPS Pathfinder ProXRT receiver.
What’s in the box? . . . . . . . . . . . . . . . .
Accessories . . . . . . . . . . . . . . . . . . . . .
Supported GPS field software . . . . . . . . .
Use and care . . . . . . . . . . . . . . . . . . . .
COCOM limits . . . . . . . . . . . . . . . . . . .
Technical support . . . . . . . . . . . . . . . . .
Your comments . . . . . . . . . . . . . . . . . .
2
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16
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17
17
18
19
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20
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22
23
Connecting to Other Equipment . . . . . . . . . . . . . . . . . . . . . . . . 25
Mounting the receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting the receiver on a range pole . . . . . . . . . . . . . . . . . . .
Carrying the receiver in a backpack . . . . . . . . . . . . . . . . . . . . .
Mounting the receiver on a vehicle magnetic mount . . . . . . . . . .
Connecting to a field computer . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the field computer using Bluetooth wireless technology
Connecting the field computer using the DB9-Lemo cable . . . . . .
Connecting the field computer using the DB9-DB9 cable . . . . . . .
Connecting to an external differential correction source . . . . . . . . . . . .
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26
26
27
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28
31
32
33
GPS Pathfinder ProXRT Receiver User Guide
5
Contents
Types of external differential correction source. . . . . . . . . . . . . . . . . . . . . . . . . . 33
Connecting a Bluetooth-enabled cellular phone for real-time corrections from an Internet
source (including VRS networks) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Connecting the GeoBeacon receiver to the field computer using Bluetooth wireless
technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Connecting an external source to the field computer using a cable . . . . . . . . . . . . . 41
Connecting an external source to the ProXRT receiver using a cable . . . . . . . . . . . . 42
Configuring the GPS field software to use corrections from an external source. . . . . . 43
4
Configuring the GPS receiver . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Supported GPS field software . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TerraSync software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ESRI ArcPad software and the Trimble GPScorrect extension. . . . .
Other GPS field applications . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring the GPS field software to connect to the receiver . . . . . . . . .
Using the GPS field software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Viewing current GPS status . . . . . . . . . . . . . . . . . . . . . . . . . .
Ensuring the accuracy of your GPS data. . . . . . . . . . . . . . . . . . . . . . .
Connecting to an integrated real-time differential correction source
Using accuracy-based logging . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring GPS quality settings . . . . . . . . . . . . . . . . . . . . . . .
Logging H-Star carrier data . . . . . . . . . . . . . . . . . . . . . . . . . .
Planning a data collection session . . . . . . . . . . . . . . . . . . . . . .
Tracking GLONASS satellites . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Upgrade to GLONASS option . . . . . . . . . . . . . . . .
Configuring the GPS field software to track GLONASS satellites . . .
5
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46
46
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47
48
49
53
54
54
55
56
56
57
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60
61
61
61
62
66
70
70
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Receiver issues . . . . . . . . . . . . . . . .
Connection issues . . . . . . . . . . . . . .
GLONASS satellite tracking issues . . .
Postprocessing issues . . . . . . . . . . . .
A
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Configuring the Receiver Using the Web Browser Interface . . . . . . . . 59
Configuring Ethernet settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring the receiver using a web browser . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supported browsers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the receiver using a web browser . . . . . . . . . . . . . . . . . . . . . . .
Connecting to the receiver using a web browser and Bluetooth wireless technology
Creating a new connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing the settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
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82
83
83
84
Understanding GPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
What is GPS?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
6
GPS Pathfinder ProXRT Receiver User Guide
Contents
What is GLONASS?. . . . . . . . . . . . . . . . . . . . . . .
Best practice guidelines for setting up the receiver . . .
Collecting real-time H-Star data. . . . . . . . . . . . . . .
Differential correction explained . . . . . . . . . . . . . .
Real-time differential correction . . . . . . . . . .
Postprocessed differential correction . . . . . . .
Postprocessed real-time differential correction .
B
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86
86
88
88
88
89
90
China RoHS Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Date of manufacture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
China RoHS information table ( 中国 RoHS 符合性信息表 ) . . . . . . . . . . . . . . . . . . . . 92
C
NMEA-0183 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
NMEA-0183 message overview
Common message elements . .
Message values . . . . . .
NMEA messages . . . . . . . . .
PTNL,GGK . . . . . . . . .
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. 94
. 95
. 95
. 95
.101
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
GPS Pathfinder ProXRT Receiver User Guide
7
Contents
8
GPS Pathfinder ProXRT Receiver User Guide
CHAPTER
1
Introduction
In this chapter:
Q
About the GPS Pathfinder ProXRT
receiver
Q
What’s in the box?
Q
Accessories
Q
Supported GPS field software
Q
Use and care
Q
COCOM limits
Q
Technical support
Q
Your comments
1
Welcome to the GPS Pathfinder ProXRT Receiver
User Guide. This guide describes how to set up
and use the Trimble® GPS Pathfinder® ProXRT
receiver.
Even if you have used other Global Positioning
System (GPS) products before, Trimble
recommends that you spend some time reading
this manual to learn more about the special
features of this product. If you are not familiar
with GPS, go to the Trimble website
(www.trimble.com) for an interactive look at
Trimble and GPS.
GPS Pathfinder ProXRT Receiver User Guide
9
1
Introduction
About the GPS Pathfinder ProXRT receiver
The Trimble GPS Pathfinder ProXRT receiver is a high-accuracy GPS receiver that uses
H-Star™ technology for decimeter and subfoot real-time or postprocessed accuracy.
The receiver is a dual-frequency receiver, that tracks both L1 and L2 GPS signals, and
optionally L1 and L2 GLONASS signals.
The ProXRT receiver can also optionally output NMEA-0183 messages.
Ideal for all GIS data collection and maintenance projects, the receiver provides a
range of options for high-accuracy positioning in real time. This enables you to collect
and update precise data for utility, urban, and natural resource databases.
The main features of the GPS Pathfinder ProXRT receiver are:
•
Decimeter and subfoot accuracy in real time, or after postprocessing, using
H-Star technology
•
Support for decimeter, subfoot, and submeter accuracy in real time using
OmniSTAR HP, XP, and VBS services, respectively
•
Optional GLONASS signal support
If you purchase the Upgrade to GLONASS option, the receiver can track
satellites that are part of the GLONASS system (GLObal NAvigation Satellite
System). Tracking GLONASS satellites as well as GPS satellites can improve
productivity by reducing the time required to achieve real-time decimeter or
subfoot solutions and increasing the amount of data collected, particularly in
tough environments such as around tall buildings and under heavy tree canopy.
For more information about the Upgrade to GLONASS option, see Tracking
GLONASS satellites, page 56.
•
Bluetooth wireless technology
The receiver has integrated Bluetooth wireless technology for cable-free
configuration and operation with a field computer on a range pole. In addition,
you can connect a Bluetooth-enabled external radio or cellular phone to access
real-time corrections from an external radio or the Internet.
Note – Trimble recommends that you use a cabled connection to the field computer when
using the ProXRT receiver in a backpack, and a Bluetooth wireless connection when the
field computer and the ProXRT receiver are both pole-mounted.
•
Internal all-day battery
The receiver has a long-life integrated battery, which typically provides 13 hours
of power between charges.
•
Optional NMEA-0183 message ouput
If you purchase the NMEA-0183 message ouput option, the receiver can output
NMEA data for use with third-party software or devices. The desired NMEA
output messages can be selected using the receiver's Web Browser Interface,
which is also activated when this option is installed.
10
GPS Pathfinder ProXRT Receiver User Guide
1
Introduction
For more information about the Web Browser Interface, see Configuring the
Receiver Using the Web Browser Interface.
For more information on configuring the NMEA-0183 output options, refer to
the I/O Configuration menu section.
What’s in the box?
When you receive the GPS Pathfinder ProXRT receiver, check that you have received
all the components, as shown in Figure 1.1.
The standard components are shown below.
GPS Pathfinder
ProXRT receiver
Hard carry case
Serial cable (Lemo)
Null modem cable
Zephyr™ Model 2
GPS antenna
Antenna cable
Multiport adaptor
AC adaptor and
International adaptor kit
User Guide and Software CD
Figure 1.1
GPS Pathfinder ProXRT receiver components
Inspect all contents for visible damage (scratches or dents). If any components appear
damaged, notify the shipping carrier. Keep the shipping and packaging material for the
carrier’s inspection.
GPS Pathfinder ProXRT Receiver User Guide
11
1
Introduction
Accessories
The following optional accessories are available:
•
Backpack
•
Range pole
•
Range pole bracket
•
Vehicle magnetic mount
•
Upgrade to GLONASS option (software)
For more information, go to the Trimble website at www.trimble.com.
Supported GPS field software
You can use the GPS Pathfinder ProXRT receiver with the following Trimble Mapping
and GIS field software:
•
TerraSync™ software version 3.20 and later
•
ESRI ArcPad 7.0.1 and later software with the Trimble GPScorrect™ extension
for ArcPad version 2.40 and later
•
Any application developed using the GPS Pathfinder Tools Software
Development Kit (SDK) version 2.30 and later
Note – The GPS Pathfinder ProXRT receiver does not operate with other software.
C
WARNING – If you upgrade to version 3.72 of the firmware, you will be required to use:
Trimble TerraSync™ software version 4.00 or later
- Trimble GPScorrect™ extension for ESRI ArcPad software version 3.00 or later
- Trimble GPS Controller software version 2.22 or later
- Third-party software based on the Trimble GPS Pathfinder Tools SDK version 2.33.
Failing this, you will not be able to connect to this GPS receiver.
Once this firmware has been uploaded onto your device you will not be able to revert to a
previous version.
For more information contact your local Trimble representative.
Use and care
This receiver can withstand normal usage outdoors. However, Trimble recommends
that, wherever possible, all GPS receiver equipment is protected from rain or water.
Keeping the receiver dry prolongs the life of the equipment and reduces the effects of
corrosion on ports and connectors. If the equipment gets wet, use a clean dry cloth to
dry the equipment and then leave the equipment open to the air to dry. Do not lock
wet equipment in a transport case for prolonged periods. Wherever possible, avoid
exposing the GPS receiver to corrosive liquids and salt water.
12
GPS Pathfinder ProXRT Receiver User Guide
1
Introduction
C
CAUTION – Operating or storing the receiver outside the specified temperature range can
damage it. For more information, see Batteries and power, page 16.
COCOM limits
The U.S. Department of Commerce requires that all exportable GPS products contain
performance limitations so that they cannot be used in a manner that could threaten
the security of the United States. The following limitations are implemented on this
product:
•
Immediate access to satellite measurements and navigation results is disabled
when the receiver velocity is computed to be greater than 1,000 knots, or its
altitude is computed to be above 18,000 meters. The receiver GPS subsystem
resets until the COCOM situation clears. As a result, all logging and stream
configurations stop until the GPS subsystem is cleared.
Technical support
Go to the GPS Pathfinder ProXRT receiver technical support page
(www.trimble.com/pathfinderproxrt_ts.asp) on the Trimble website for the latest
support information about the receiver, including:
•
FAQs
•
support notes detailing the latest support issues
•
documentation
•
the latest files available for download
Your comments
Your feedback about the supporting documentation helps us to improve it with each
revision. Email your comments to ReaderFeedback@trimble.com.
GPS Pathfinder ProXRT Receiver User Guide
13
1
14
Introduction
GPS Pathfinder ProXRT Receiver User Guide
CHAPTER
2
Getting Started
In this chapter:
Q
Batteries and power
Q
Keypad and display
Q
Rear connectors
Q
Receiver operation overview
2
This chapter provides the information you need
to get up and running with the GPS Pathfinder
ProXRT receiver.
GPS Pathfinder ProXRT Receiver User Guide
15
2
Getting Started
Batteries and power
The GPS Pathfinder ProXRT receiver uses an internal rechargeable Lithium-ion
battery, which can be replaced only at an authorized Trimble Service Center.
The receiver can also be powered by an external power source that is connected to the
Lemo or modem port.
The operational time provided by the internal battery depends on the type of
measurement and operating conditions. Typically, the internal battery
provides 13 hours of operation time.
Note – All battery operation tests are carried out with new, fully charged batteries at room
temperature and full receiver configuration operational. Older batteries, at temperatures
significantly higher or lower than room temperature, will have a reduced performance.
External power
The receiver uses an external power source in preference to its internal batteries. If the
receiver is not connected to an external power source, or if the external power supply
fails, the internal batteries are used.
Note – The life of the battery can be significantly shortened if power is constantly supplied
to the receiver. To avoid this issue, connect the receiver to an external power source only
when the battery requires charging. Once fully charged, disconnect the external power
source and allow the battery to discharge through normal use.
Battery safety
The receiver is powered by a rechargable internal Lithium-ion battery. Charge and use
the battery only in strict accordance with the instructions below.
16
C
WARNING – Do not damage the rechargeable Lithium-ion battery. A damaged battery
can cause an explosion or fire, and can result in personal injury and/or property damage.
To prevent injury or damage:
– Do not use or charge the battery if it appears to be damaged. Signs of damage include,
but are not limited to, discoloration, warping, and leaking battery fluid.
– Do not expose the battery to fire, high temperature, or direct sunlight.
– Do not immerse the battery in water.
– Do not use or store the battery inside a vehicle during hot weather.
– Do not drop or puncture the battery.
– Do not open the battery or short-circuit its contacts.
C
WARNING – Avoid contact with the rechargeable Lithium-ion battery if it appears to be
leaking. Battery fluid is corrosive, and contact with it can result in personal injury and/or
property damage.
To prevent injury or damage:
– If the battery leaks, avoid contact with the battery fluid.
– If battery fluid gets into your eyes, immediately rinse your eyes with clean water and
seek medical attention. Do not rub your eyes!
– If battery fluid gets onto your skin or clothing, immediately use clean water to wash off
the battery fluid.
GPS Pathfinder ProXRT Receiver User Guide
2
Getting Started
Battery performance
To optimize battery performance and extend battery life:
•
Fully charge all new batteries before use.
•
Batteries perform best when they are not used at extreme temperatures. The
receiver is designed to operate at –20 °C to +60 °C (–4 °F to +140 °F). However,
operation at temperatures of less than 0 °C (32 °F) can cause a rapid drop in
operating time.
•
Do not allow a battery that is in storage to discharge to below 5 V.
Note – The supported GPS field software does not turn on or turn off the GPS Pathfinder
ProXRT receiver when connecting or disconnecting to the receiver. Remember to turn off
the receiver to save battery power when you disconnect from the receiver or close the GPS
field software .
Charging the Lithium-ion battery
The rechargeable Lithium-ion battery is supplied partially charged. Charge the battery
completely before using it for the first time. If the battery has been stored for longer
than three months, charge it before use.
The internal battery charges fully in 8 hours when connected to a suitable power
source.
C
WARNING – To use AC adaptors safely:
– Use only the AC adaptor intended for the GPS Pathfinder ProXRT receiver. Using any
other AC adaptor can damage the receiver and may void your warranty. Do not use
the AC adaptor with any other product.
– Make certain that the input voltage on the adaptor matches the voltage and frequency
in your location.
– Make certain that the adaptor has prongs compatible with your outlets.
– Do not use the AC adaptor in wet outdoor areas; it is designed for indoor use only.
– Unplug the AC adaptor from power when not in use.
– Do not short the output connector.
– Be aware that there are no user-serviceable parts in this product.
– If the AC adaptor becomes damaged, replace it with a new Trimble AC adaptor.
C
WARNING – Charge and use the rechargeable Lithium-ion battery only in strict
accordance with the instructions. Charging or using the battery in unauthorized
equipment can cause an explosion or fire, and can result in personal injury and/or
equipment damage.
To prevent injury or damage:
– Do not charge or use the battery if it appears to be damaged or leaking.
– Charge the Lithium-ion battery only with a Trimble product that is specified to charge it.
Be sure to follow all instructions that are provided with the battery charger.
– Discontinue charging a battery that gives off extreme heat or a burning odor.
– Use the battery only in Trimble equipment that is specified to use it.
– Use the battery only for its intended use and according to the instructions in the product
documentation.
GPS Pathfinder ProXRT Receiver User Guide
17
2
Getting Started
To charge the battery:
1.
Connect one end of the multiport adaptor to the 26-pin plug on the receiver.
2.
Connect the other end of the multiport adaptor to the AC adaptor.
3.
Connect the AC adaptor to an AC power outlet. An international adaptor kit is
provided with the receiver.
When the internal temperature of the receiver is greater than 50 °C (122 °F) or less than
5 °C (41 °F), the internal battery charger stops charging and the receiver’s display shows
Charger Disabled, Temp Limited. However, the receiver still draws its power from the
external DC source, extending the operating time in the field.
When the external DC voltage is less than 15 V DC, an X is displayed across the battery
status icon on the front panel display, which indicates that the internal charger is off.
Storing the Lithium-ion battery
If you must store a Lithium-ion battery for long periods, make sure that it is fully
charged before it is stored, and that you charge it at least once every three months
while it is stored.
Do not allow a battery that is in storage to discharge to below 5 V. A battery that
reaches deep discharge level (5 V or less) cannot be recharged and must be replaced.
(To protect a battery that is in use from deep discharge, the receiver switches power
sources or stops drawing power when the battery pack discharges to 5.9 V.)
18
GPS Pathfinder ProXRT Receiver User Guide
2
Getting Started
All batteries discharge over time when not in use, and they discharge faster in colder
temperatures. Do not store the receiver at temperatures outside the range –20 °C to
+60 °C (–4 °F to +140 °F).
The internal Lithium-ion battery will charge only from an external power source that
delivers more than 15 volts, for example, an AC power adaptor. The receiver is supplied
with a mains power supply unit that recharges the battery inside the receiver when it is
connected through the adaptor to the modem port.
Removing the rechargeable Lithium-ion battery
The internal Lithium-ion battery should be removed only at an authorized Trimble
Service Center. If the battery is removed at an unauthorized service center, the
remaining warranty on the product is void.
Keypad and display
1
4
2
3
2
Feature
Description
1
Power LED
Indicates if the receiver is turned on or off.
2
Buttons
Use to turn on and to view the status of the receiver (see Button functions
below).
3
Display
The Vacuum Fluorescent Display allows you to see how the receiver is operating.
4
Bluetooth antenna
Location of the Bluetooth antenna.
Figure 2.1
Front view of the receiver
GPS Pathfinder ProXRT Receiver User Guide
19
2
Getting Started
Button functions
Use the buttons on the front panel to turn on and turn off the receiver and to check the
receiver settings.
C
CAUTION – Do not use the front panel of the GPS Pathfinder ProXRT receiver to
configure the receiver settings. Any settings you configure are reset the next time you
connect to the receiver from the GPS field software, and using the front panel to
reconfigure settings during data collection may cause problems with your data. To avoid
problems, always configure the receiver using the GPS field software. For more
information, see Chapter 4, Configuring the GPS receiver.
Button
Name
Function
E
Power
Turns the receiver on and off. See Power button operations below.
F
Escape
Returns to the previous screen.
L
Enter
Advances to the next screen.
J
Up
Moves the cursor between multiple fields on a screen.
K
Down
Moves the cursor between multiple fields on a screen.
I
Left
Moves the cursor between characters.
G
Right
Moves the cursor between characters.
Power button operations
Press the Power button E to turn on and turn off the receiver. In addition, tap E to
return to the Home screen, or hold down E to perform the following operations:
To…
Hold the E
button for…
Notes
turn off the receiver
two seconds
The display shows a countdown timer. When the display goes blank,
release the Power button.
clear the almanac,
ephemeris, and
satellite information
15 seconds
The display shows a countdown timer. When the display goes blank,
continue to hold the Power button. The display shows a countdown
time to clear the almanac and ephemeris. When the counter reaches
0, release the Power button.
reset the receiver to
the factory default
settings
35 seconds
The display shows a countdown to turn off the receiver, another
countdown to clear the almanac and ephemeris and then shows a
third countdown time to reset the receiver. When this counter
reaches 0, release the Power button.
force the receiver to
turn off
at least 60
seconds
If the reset method above does not work, use this method to force
the receiver to turn off. When the Power LED goes off, release the
Power button.
20
GPS Pathfinder ProXRT Receiver User Guide
Getting Started
2
Home screen
The Home screen is the main screen displayed on the receiver. If the receiver is
displaying another screen and is left idle for 60 seconds, you are returned to the Home
screen. It shows the following information:
•
Number of satellites being tracked:
–
The number of satellites used to calculate the position.
–
If the receiver is set to use SBAS or OmniSTAR corrections, the Home
screen displays the number of satellites for which corrections have been
received.
–
If the receiver is computing an autonomous solution, the Home screen
displays all satellites in view, that is, all satellites above the elevation mask.
•
Internal battery power remaining
•
Current mode configuration
Status screens
The receiver has several view-only status screens that allow you to review the current
settings of the receiver. The status screens provide the following information:
•
Position solution and precisions
•
CMR and RTCM IDs
•
Latitude, longitude, and height
•
Antenna height
•
Horizontal and vertical precision
•
Receiver firmware version
•
Receiver serial number
To access these screens from the Home screen, press J
or K .
Note – Depending on the settings in the GPS field software, some of the status values
displayed on the front screen may differ slightly from that shown in the GPS field software.
GPS Pathfinder ProXRT Receiver User Guide
21
2
Getting Started
Rear connectors
1
4
3
2
Connector type
Description
1
TNC
Connect to the GPS antenna
2
Vent plug
External venting plug for pressure equalization
3
High Density
DB26
• Charge the internal battery using the Trimble AC/DC power
supply and the multiport adaptor
• Full 9-wire RS-232 serial communications using the 26-9-pin
multiport adaptor
4
Lemo (7-pin/0-shell)
3 wire RS-232 serial communications using a 7-pin/ O-shell Lemo
cable
Figure 2.2
22
Rear view of the receiver
GPS Pathfinder ProXRT Receiver User Guide
2
Getting Started
Receiver operation overview
To collect data in the field using the receiver, you need the following components:
•
GPS Pathfinder ProXRT receiver
•
GPS antenna and antenna cable
•
Selected mounting accessories, such as range pole and bracket, backpack, or
vehicle magnetic mount
•
Field computer running supported GPS field software
•
External devices, required only when connecting to an external real-time
differential correction source, such as a cellular phone, external data radio, or
GeoBeacon receiver
The GPS Pathfinder ProXRT receiver incorporates the GPS receiver and power supply
into a single unit. In most applications, the receiver operates entirely from its own
integrated battery unit. However, on a vehicle you can use an external power supply;
the internal battery then acts as a backup power supply, covering any external power
failures.
The GPS antenna is separate from the receiver. To receive GPS positions, you must
connect the receiver to the Zephyr Model 2 antenna. To ensure maximum
performance, mount the antenna so that it is clear of obstructions, such as on a range
pole, on a backpack, or on a vehicle roof.
Connect the receiver to a field computer running supported GPS field software. Use
the GPS field software to configure the receiver and to collect data.
The receiver can be connected to a source of real-time corrections such as a virtual
reference station system. The connection is provided through an external cellular
phone or an external radio that is connected to the receiver either by Bluetooth
wireless technology or by means of a cable. Configure the Trimble GPS field software to
use the real-time corrections received from the external correction source.
The correction stream from an SBAS (WAAS/EGNOS/MSAS) or an OmniSTAR service
is broadcast through geostationary satellites, and detected by the GPS antenna itself.
No external radio or base station is required. Configure the GPS field software to use
the real-time corrections received from the SBAS or OmniSTAR service.
Note – To receive OmniSTAR corrections, you must purchase a subscription to an
OmniSTAR service. For more information, see Using OmniSTAR real-time corrections,
page 49.
GPS Pathfinder ProXRT Receiver User Guide
23
2
24
Getting Started
GPS Pathfinder ProXRT Receiver User Guide
CHAPTER
3
Connecting to Other Equipment
In this chapter:
Q
Mounting the receiver
Q
Connecting to a field computer
Q
Connecting to an external
differential correction source
3
This chapter explains how to mount the receiver
on a range pole or backpack, and how to connect
the receiver to external equipment, including a
field computer and external real-time differential
correction sources.
The chapter covers connections using cables or
Bluetooth wireless technology.
GPS Pathfinder ProXRT Receiver User Guide
25
3
Connecting to Other Equipment
Mounting the receiver
Mounting the receiver on a range pole
26
1.
Attach the two range pole mounting brackets to the pole.
2.
Tighten the top bracket, making sure that it is at a convenient height for the
receiver.
3.
Place the GPS Pathfinder ProXRT receiver in the slot in the pole bracket, and
then secure it with the tripod clip.
4.
Move the lower pole bracket down until it is over the second tripod clip on the
receiver and then tighten the pole bracket onto the pole. The receiver is held in
place between the two brackets.
5.
Insert the field computer into the field computer bracket.
6.
Use the 5/8" thread to attach the GPS antenna to the top of the pole.
7.
Use the GPS antenna cable to connect the GPS antenna to the receiver.
GPS Pathfinder ProXRT Receiver User Guide
Connecting to Other Equipment
3
Carrying the receiver in a backpack
If you prefer to work free of the weight of the receiver on a pole, you can carry it in a
backpack, with the antenna mounted on the backpack pole. If you carry the receiver in
a backpack and are using an external radio, use an external radio antenna mount for
optimal radio signal reception.
Mounting the receiver on a vehicle magnetic mount
1.
Attach the magnetic mount screwthread adaptor to the GPS antenna.
2.
Attach the GPS antenna to the roof of the vehicle.
3.
Run the GPS antenna cable for the receiver into the vehicle either through a
rubber grommet in the roof, or through the passenger door window, which must
be left slightly open during operation.
4.
Place and secure the GPS Pathfinder ProXRT receiver and the field computer in
a convenient location in the vehicle.
5.
Use a cable or Bluetooth wireless technology to connect the receiver to the field
computer. For more information, see Connecting to a field computer below.
Connecting to a field computer
You can operate a GPS Pathfinder ProXRT receiver with a field computer (such as a
handheld device, a Tablet PC, or a laptop) that is running supported GPS field software.
For a list of supported GPS field software, see page 46.
Typically, the receiver and the field computer operate from their own individual power
sources.
Note – The supported GPS field software does not turn on or turn off the receiver when
connecting or disconnecting to the receiver. Remember to turn off the receiver to save
battery power when you disconnect from the receiver or close the GPS field software .
You can connect the field computer to the receiver using Bluetooth wireless
technology, or using the cables provided with the receiver.
Note – Trimble recommends that you use a cabled connection to the field computer when
using the ProXRT receiver in a backpack, and a Bluetooth wireless connection when the
field computer and the ProXRT receiver are both pole-mounted.
Note – The rest of this section assumes that the field computer you are using is powered by
the Windows Mobile® operating system.
GPS Pathfinder ProXRT Receiver User Guide
27
3
Connecting to Other Equipment
Connecting the field computer using Bluetooth wireless technology
Bluetooth wireless technology is an industry standard specification that eliminates the
need for cables between Bluetooth-enabled devices.
The GPS Pathfinder ProXRT receiver’s integrated Bluetooth radio is always on and
discoverable. This means that when you turn on the receiver, it can always be detected
by other devices when they scan.
To connect a field computer to the receiver using Bluetooth wireless technology, you
must:
1.
Connect the field computer to the receiver.
2.
Configure the COM port on the field computer to use for the connection.
3.
Configure the GPS field software to connect to the receiver.
Step 1: Connecting the field computer to the receiver
28
1.
Connect one end of the antenna cable to the TNC connector on the rear of the
receiver, and the other end of the cable to the antenna.
2.
Turn on the receiver.
3.
Make sure that the Bluetooth radio in the field computer is turned on.
4.
On the field computer, tap
GPS Pathfinder ProXRT Receiver User Guide
/ Settings / Connections / Bluetooth.
3
Connecting to Other Equipment
5.
In the Devices tab, tap Add new device or New
Partnership.
The field computer searches for other Bluetooth
devices and displays them in the list.
6.
From the list of available devices, select the GPS
Pathfinder ProXRT receiver and then tap Next on
the right softkey.
The Enter Passcode screen appears.
7.
Tap Next without entering a passcode.
8.
If prompted to add the device to your device list,
tap No.
The Partnership Settings screen appears.
9.
If required, change the name of the device in the Display Name field.
10. Select the Serial Port check box and then tap Finish on the right softkey.
11. Tap OK in the top right corner of the screen to close the Bluetooth application.
12. Tap
in the top right corner to close the Settings screen.
You have now created a partnership between the field computer and the other
Bluetooth-enabled device so that they can communicate.
Step 2: Configuring the COM port to use on the field computer
1.
On the field computer, tap
2.
Tap the COM Ports tab.
3.
Tap New Outgoing Port.
4.
Select the GPS Pathfinder ProXRT receiver and
then tap Next on the right softkey.
5.
Select the COM port on the field computer to use
for the connection.
6.
Clear the Secure Connection check box.
7.
Tap Finish on the right softkey.
8.
Tap OK in the top right corner to close the
Bluetooth application.
9.
Tap
in the top right corner to close the Settings
screen.
/ Settings / Connections / Bluetooth.
GPS Pathfinder ProXRT Receiver User Guide
29
3
Connecting to Other Equipment
Step 3: Configuring the GPS field software to connect to the receiver
1.
On the field computer, start the GPS field software and then open the Setup
section.
2.
Tap GPS Settings. The GPS Settings form appears.
3.
From the GPS Receiver Port field, select the COM
port that you selected for the Bluetooth wireless
connection.
4.
Tap OK to close the GPS Settings form.
5.
To connect the software to the receiver, tap GPS at
the top of the main screen of the Setup section.
Reconnecting the field computer to the receiver
To reconnect the field computer to the receiver at any time:
30
1.
Turn on the receiver.
2.
Turn on the Bluetooth radio in the field computer.
3.
On the field computer, start the GPS field software and make sure that the
correct COM port is selected in the GPS Receiver Port field.
4.
Tap the GPS button.
GPS Pathfinder ProXRT Receiver User Guide
3
Connecting to Other Equipment
Connecting the field computer using the DB9-Lemo cable
Note – To be able to connect to a Trimble Nomad™ series handheld using a cable, you
must purchase the optional serial boot for the handheld.
1.
Connect one end of the antenna cable to the TNC connector on the rear of the
receiver, and the other end of the cable to the antenna.
2.
Connect the DB9 plug on the cable to the serial port on the field computer.
3.
Connect the Lemo plug on the cable to the Lemo socket on the receiver.
4.
Turn on the receiver.
5.
To connect the Trimble GPS field software to the GPS Pathfinder ProXRT
receiver:
a.
On the field computer, start the GPS field
software and then open the Setup section.
b.
Tap GPS Settings. The GPS Settings form
appears.
c.
From the GPS Receiver Port field, select COM1
(or whatever the serial port is called on the
field computer).
d.
Tap OK to close the GPS Settings form.
e.
To connect the software to the receiver, tap
GPS at the top of the main screen of the Setup
section.
GPS Pathfinder ProXRT Receiver User Guide
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3
Connecting to Other Equipment
Connecting the field computer using the DB9-DB9 cable
Note – To be able to connect to a Trimble Nomad series handheld using a cable, you must
purchase the optional serial boot for the handheld.
If you use a cable to connect to an external real-time correction source, use the
DB9-DB9 cable with the mulitport adaptor to connect to the field computer. For more
information, see Connecting to an external differential correction source, page 33.
1.
Connect one end of the antenna cable to the TNC connector on the rear of the
receiver, and the other end of the cable to the antenna.
2.
Connect one end of the DB9-DB9 cable to the serial port on the field computer.
3.
Connect the other end of the cable to the multiport adaptor, and connect the
multiport adaptor to the receiver.
4.
Turn on the receiver.
5.
To connect the GPS field software to the receiver:
a.
On the field computer, start the GPS field
software and then open the Setup section.
b.
Tap GPS Settings. The GPS Settings form
appears.
c.
From the GPS Receiver Port field, select COM1
(or whatever the serial port is called on the
field computer).
d.
Tap OK to close the GPS Settings form.
e.
To connect the software to the receiver, tap
GPS at the top of the main screen of the Setup
section.
32
GPS Pathfinder ProXRT Receiver User Guide
3
Connecting to Other Equipment
Connecting to an external differential correction source
This section describes how to connect the GPS Pathfinder ProXRT receiver to an
external correction source. If you are using the integrated SBAS or OmniSTAR receiver
to receive real-time differential corrections, you do not need to connect another
device. For more information about using the integrated receivers, see Connecting to
an integrated real-time differential correction source, page 49.
Types of external differential correction source
The types of external correction devices that you can connect to are described below.
Bluetooth-enabled cellular phone connected to a server
To access a VRS™ network or other correction source that is transmitting corrections
over the Internet, use the Bluetooth radio in the field computer to connect to a
Bluetooth-enabled cellular phone and then connect to the Internet.
A VRS network uses data from several base stations to provide rover receivers with
corrections that are generally more accurate than corrections from a single base
station. Real-time differential corrections generated by a VRS network are commonly
transmitted by an Internet server. Alternatively, you can connect to a server that
provides real-time differential corrections from a single base station.
GeoBeacon receiver
You can configure the GPS Pathfinder ProXRT receiver to receive real-time differential
corrections from a GeoBeacon™ receiver.
You can connect the GeoBeacon receiver to the field computer using Bluetooth
wireless technology or using the DB9-Lemo cable. Alternatively, connect the
GeoBeacon receiver to the GPS Pathfinder ProXRT receiver using the DB9-DB9 cable
with the multiport adaptor.
External radio
You can configure the GPS Pathfinder ProXRT receiver to receive real-time differential
corrections from an external radio. In addition to Trimble radios, the receiver supports
third-party transparent radios and third-party cellular modems.
Connect the external radio to the field computer using the DB9-Lemo cable.
Alternatively, connect the external radio to the receiver using the DB9-DB9 cable with
the multiport adaptor.
GPS Pathfinder ProXRT Receiver User Guide
33
3
Connecting to Other Equipment
Connecting a Bluetooth-enabled cellular phone for real-time corrections
from an Internet source (including VRS networks)
To access a VRS network or other correction source that is transmitting corrections
over the Internet, use the Bluetooth radio in the field computer to connect to a
Bluetooth-enabled cellular phone and then connect to the Internet.
Note – Some cellular phones support the Bluetooth PAN (Personal Area Networking)
service as well as the Bluetooth DUN (Dialup Networking) service. Because DUN
connections are more common, this section assumes you are making a dialup network
connection with the Bluetooth-enabled phone.
To connect to a Bluetooth-enabled phone using a Bluetooth DUN (Dialup Networking)
connection, you must:
1.
Connect the field computer to the receiver.
2.
Connect the field computer to a Bluetooth-enabled phone and then configure
the connection to the dialup network.
3.
Connect to the Internet using the dialup network.
4.
Configure the GPS field software to use real-time corrections received from the
Internet source.
Note – Before you begin the steps below, Trimble recommends that you confirm that the
phone can access the Internet directly. If necessary, contact the cellular phone provider
and confirm whether you must enter a user name, password, and domain details when
connecting an external device to the phone using Bluetooth dialup networking.
Step 1: Connecting the field computer to the receiver
Connect the field computer to the GPS Pathfinder ProXRT receiver, using either
Bluetooth wireless technology or a cabled connection. For more information, see
Connecting to a field computer, page 27.
34
GPS Pathfinder ProXRT Receiver User Guide
3
Connecting to Other Equipment
Step 2: Connecting the field computer to the phone and configuring the
connection to the dialup network
1.
Make sure that the field computer and the phone are within five meters of each
other, and that the Bluetooth radio in each device is turned on.
2.
On the field computer, tap
3.
Below My ISP, tap Add a new modem connection.
4.
Enter the name for the connection. For example,
enter the name of the phone or the VRS network
that you will connect to.
5.
From the Select a Modem dropdown list, select
Bluetooth and then tap Next on the right softkey.
6.
If the phone you want to connect to is:
–
listed, go to Step 7 below.
–
not listed:
/ Settings / Connections / Connections.
a. Tap Add new device or New Partnership.
The field computer searches for other
Bluetooth devices and displays them in
the list.
b. From the list of available devices, select the phone you want to connect
to and then tap Next on the right softkey.
c. To pair with the phone, enter a passcode of your choice that you will
easily remember onto the field computer and then tap Next on the right
softkey.
d. When prompted by the phone, enter the same password and then
accept the connection.
e. On the field computer, in the Partnership Settings screen, make sure that
Dialup Networking (DUN) is selected and then tap Finish on the right
softkey.
You have now created a partnership between the field computer and the
phone so that they can communicate.
7.
From the My Connections list, select the phone that you want to configure the
connection to and then if required tap Next on the right softkey.
8.
Enter the GPRS access number for the Internet.
Two of the common GPRS access numbers for cellular phones on GSM
networks are *99***1# and *99#. If these access numbers do not work, contact
the cellular phone provider to obtain the appropriate number to use.
Note – You do not need to set up dialling rules or change the Internet connection settings
on the phone. The connection settings you enter on the field computer are passed to the
phone to use for this connection.
GPS Pathfinder ProXRT Receiver User Guide
35
3
Connecting to Other Equipment
9.
Tap Next on the right softkey.
10. Unless the phone provider confirmed that you must enter user name, password,
and domain settings to access the Internet, tap Finish on the right softkey
without entering any information in this screen.
Otherwise:
a.
Enter the required information.
b.
If the phone provider has told you that you need to change the baud rate or
other settings for the connection, tap Advanced, configure these settings
and then tap OK in the top right corner of the screen.
c.
Tap Finish on the right softkey.
You are returned to the Connections screen.
You have now configured the dialup networking connection.
Step 3: Connecting to the Internet using the dialup network
1.
On the field computer, go to the Connections screen, if it is not already open (tap
/ Settings / Connections / Connections).
2.
Below My ISP, tap Manage existing connections.
3.
Tap and hold the connection you want to use and then select Connect.
4.
Unless the phone provider confirmed that you must enter user name, password,
and domain settings to access the Internet, tap OK on the left softkey without
entering any information in this screen. Otherwise, enter the required
information and then tap OK on the left softkey.
5.
If the phone prompts you for confirmation to connect to the Internet, accept the
connection.
The phone dials the configured GPRS access number and then connects to the
Internet.
A Connectivity notification appears on the field computer as the connection is
being made.
After the connection is made you are returned to the My ISP screen.
To confirm that the field computer is connected to the phone, or to check the
status of the connection at any time, tap the Connectivity icon
in the title
bar. The notification shows the name of the current connection, and the time
elapsed since the connection was made. To hide the notification, tap Hide.
Note – If you have an active wireless LAN connection, the connectivity icon appears as
instead.
36
6.
Tap OK in the top right corner of the screen to close the My ISP screen.
7.
Tap OK in the top right corner to close the Connections screen.
8.
Tap
in the top right corner to close the Settings screen.
GPS Pathfinder ProXRT Receiver User Guide
3
Connecting to Other Equipment
To check the connection status at any time, tap the
To end the connection at any time, tap the
Disconnect.
or
or
icon in the title bar.
icon in the title bar and then tap
Step 4: Configuring the GPS field software to use real-time corrections
from the Internet source
1.
On the field computer, start the Trimble GPS field software and then open the
Setup section.
2.
Tap Real-time Settings. The Real-time Settings form appears.
3.
From the Choice 1 field, select External Source.
4.
Configure the external source:
a.
Tap the Setup button
beside the Choice 1
field. The External Source Settings form
appears.
b.
From the Correction Datum field, select the
same datum as the VRS network coordinate
system.
c.
From the Type field, select:
– VRS if the real-time correction source is a
VRS network.
– Single Base if the real-time correction
source is a single base station that
broadcasts its corrections over the
Internet.
d.
From the Connection Method field, select Internet.
e.
In the Address field, enter the IP address or URL of the VRS network or the
server that is supplying the corrections from the VRS network.
Typically, the IP address or URL of a VRS network has the format
10.3.123.456:1234, where the digits before the colon (:) are the address, and
the digits after the colon (:) are the port number.
f.
In the Port field, enter the port number that you will use to connect to the
server.
g.
If you are connecting to a VRS network through a broadcast server, tap the
Setup button
beside the Source field. The GPS field software attempts to
establish a connection to the broadcast server. If the connection is
successful, the Select Server form appears. Select the server that you want
to use and then tap OK to return to the External Source Settings form.
h.
If you selected a VRS network that requires authentication, the Name and
Password fields appear. Enter the user name and password that you
obtained from the service provider.
GPS Pathfinder ProXRT Receiver User Guide
37
3
Connecting to Other Equipment
i.
From the Connection Control field, select:
– Auto if you want the GPS field software to automatically establish and
end connections to the VRS network as necessary.
– Manual if you want to connect or disconnect only when you tap Ext
Source in the Setup screen.
j.
5.
Tap OK to confirm the settings and return to the Real-time Settings form.
Tap OK to confirm the real-time settings and return to the main screen of the
Setup section.
If you selected Auto in the Connection Control field, the Ext Source button is
depressed and the software attempts to connect to the server.
6.
B
If you selected Manual in the Connection Control field, tap the Ext Source
button that appears below the Status bar in the Setup section to connect the
Trimble GPS field software to the Internet correction source.
Tip – To disconnect or reconnect to the server at any time, tap Ext Source. To view the
status of the real-time correction source, open the Status section, select the Real-time
subsection and then select External from the Summary list button.
Reconnecting to the Internet
To reconnect to the Internet at any time after setting up the connection, repeat steps 3
through 8 on page 36.
If you selected Auto in the Connection Control field of the Trimble GPS field software,
the software automatically connects to the Internet source that is providing real-time
differential corrections.
To manually reconnect the Trimble GPS field software to the Internet source that is
providing real-time differential corrections, open the software and then tap the Ext
Source button that appears below the status bar in the Setup section.
38
GPS Pathfinder ProXRT Receiver User Guide
3
Connecting to Other Equipment
Connecting the GeoBeacon receiver to the field computer using
Bluetooth wireless technology
To receive real-time corrections from a GeoBeacon receiver that is connected to the
field computer using Bluetooth wireless technology, you must:
1.
Connect the field computer to the GPS Pathfinder ProXRT receiver.
2.
Connect the field computer to the GeoBeacon receiver.
3.
Configure the COM port on the field computer to use for the GeoBeacon
receiver connection.
4.
Configure the GPS field software to use real-time corrections received from the
GeoBeacon receiver.
Step 1: Connecting the field computer to the receiver
Connect the field computer to the GPS Pathfinder ProXRT receiver, using either
Bluetooth wireless technology or a cabled connection. For more information, see
Connecting to a field computer, page 27.
Step 2: Connecting the field computer to the GeoBeacon receiver
1.
Make sure that the Bluetooth radios in the field computer and the GeoBeacon
receiver are turned on, and that the devices are within range.
2.
On the field computer, tap
3.
In the Devices tab, tap Add new device or New
Partnership.
/ Settings / Connections / Bluetooth.
The field computer searches for other Bluetooth
devices and displays them in the list.
4.
From the list of available devices, select the
GeoBeacon receiver and then tap Next on the
right softkey.
The Enter Passcode screen appears.
5.
Tap Next without entering a passcode.
6.
If prompted to add the device to your device list,
tap No.
The Partnership Settings screen appears.
7.
If required, change the name of the device in the Display Name field.
8.
Select the Serial Port check box and then tap Finish on the right softkey.
9.
Tap OK in the top right corner of the screen to close the Bluetooth application.
10. Tap
in the top right corner to close the Settings screen.
You have now created a partnership between the field computer and the GeoBeacon
receiver so that they can communicate.
GPS Pathfinder ProXRT Receiver User Guide
39
3
Connecting to Other Equipment
Step 3: Configuring the COM port to use on the field computer
1.
On the field computer, tap
2.
Tap the COM Ports tab.
3.
Tap New Outgoing Port.
4.
Select the GeoBeacon receiver and then tap Next
on the right softkey.
5.
Select the COM port on the field computer to use
for the connection.
6.
Clear the Secure Connection check box.
7.
Tap Finish on the right softkey.
8.
Tap OK in the top right corner to close the
Bluetooth application.
9.
Tap
in the top right corner to close the Settings
screen.
/ Settings / Connections / Bluetooth.
The connection between the field computer and the GeoBeacon is now set up,
and the devices are connected.
B
Tip – The GeoBeacon receiver has been added to the list of Client Serial Ports. To use this
connection any time, turn on the GeoBeacon receiver and then the Bluetooth radio in the
field computer.
10. Configure the GPS field software to use the corrections from the GeoBeacon
receiver (see page 43).
40
GPS Pathfinder ProXRT Receiver User Guide
3
Connecting to Other Equipment
Connecting an external source to the field computer using a cable
Note – If the field computer has only one serial port and you are using that port to connect
to the ProXRT receiver, connect the external correction source to the ProXRT receiver
instead of the field computer (see page 42).
1.
Connect the field computer to the ProXRT receiver (see Connecting to a field
computer, page 27).
2.
If the external source has an integrated Bluetooth radio, turn off the Bluetooth
radio.
Note – You cannot operate the GeoBeacon receiver over a cabled connection and use the
GeoBeacon receiver’s integrated Bluetooth radio at the same time. Turn off the radio before
connecting the cable to the GeoBeacon receiver.
3.
Connect one end of the DB9-DB9 cable to the field computer.
4.
Connect the other end of the cable to the external source.
5.
Configure the GPS field software to use the corrections from the external source
(see page 43).
6.
If you are connecting to an external radio, configure the radio separately, using
either the configuration program for the external radio or the radio display and
keypad.
Note – When used with the ProXRT receiver, most external radios require an external
power source.
GPS Pathfinder ProXRT Receiver User Guide
41
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Connecting to Other Equipment
Connecting an external source to the ProXRT receiver using a cable
Use this method if the field computer has only one serial port and you are using that
port to connect to the GPS Pathfinder ProXRT receiver.
1.
Connect the field computer to the receiver (see Connecting to a field computer,
page 27).
2.
If the external source has an integrated Bluetooth radio, turn off the Bluetooth
radio.
Note – You cannot operate the GeoBeacon receiver over a cabled connection and use the
GeoBeacon receiver’s integrated Bluetooth radio at the same time. Turn off the radio before
connecting the cable to the GeoBeacon receiver.
3.
Connect one end of the DB9-DB9 cable to the external source.
4.
Connect the other end of the cable to the DB9 socket on the multiport adaptor
and then connect the other end of the adaptor to the 26-pin plug on the receiver.
5.
Configure the GPS field software to use the corrections from the external source
(see page 43).
6.
If you are connecting to an external radio, configure the radio separately, using
either the configuration program for the external radio or the radio display and
keypad.
Note – When used with the ProXRT receiver, most external radios require an external
power source.
42
GPS Pathfinder ProXRT Receiver User Guide
3
Connecting to Other Equipment
Configuring the GPS field software to use corrections from an external
source
Note – For information on configuring the GPS field software to use corrections from a VRS
network or single base station that transmits corrections over the Internet, see Step 4:
Configuring the GPS field software to use real-time corrections from the Internet source,
page 37.
To configure the software to use corrections from a cellular modem, a GeoBeacon
receiver, or an external radio:
1.
In the GPS field software, open the Real-time
section and then tap the Setup button .
2.
In the Choice 1 field, select External Source.
3.
Tap the Setup button
field.
4.
In the Type field, select Single Base.
5.
In the Connection Method field, select the method
used to connect the external device. If the device
is connected to:
6.
next to the Choice 1
–
an Internet server, see page 37.
–
the field computer, select Serial Port and
then select the COM port to use from the Port field. If the device is
connected by cable, select COM1. If it is connected using Bluetooth
wireless technology, select the COM port you configured for the Bluetooth
connection in the Bluetooth control software.
–
the receiver, select Receiver Port and then select the port to use from the
Port field.
Tap OK.
For more information, refer to the documentation provided with the GPS field
software.
GPS Pathfinder ProXRT Receiver User Guide
43
3
44
Connecting to Other Equipment
GPS Pathfinder ProXRT Receiver User Guide
CHAPTER
4
Configuring the GPS receiver
In this chapter:
Q
Supported GPS field software
Q
Configuring the GPS field
software to connect to the
receiver
Q
Using the GPS field software
Q
Connecting to an integrated
real-time differential correction
source
Q
Ensuring the accuracy of your GPS
data
Q
Tracking GLONASS satellites
4
The GPS Pathfinder ProXRT receiver enables you
to collect GPS and GLONASS data for
incorporating into a GIS or for managing assets.
This chapter explains how to configure the
receiver using supported Trimble GPS field
software.
For more information on GPS and GLONASS, see
Appendix A, Understanding GPS.
GPS Pathfinder ProXRT Receiver User Guide
45
4
Configuring the GPS receiver
Supported GPS field software
You can use the GPS Pathfinder ProXRT receiver with any of the software products
described below.
Note – The GPS Pathfinder ProXRT receiver does not operate with other software.
TerraSync software
You can install version 3.20 or later of the TerraSync software on a field computer,
notebook, or Tablet PC. Use the software to collect and maintain GIS and GPS data.
ESRI ArcPad software and the Trimble GPScorrect extension
You can install version 7.0.1 or later of the ESRI ArcPad software and version 2.40 or
later of the Trimble GPScorrect extension for ESRI ArcPad software on a field
computer, notebook, or Tablet PC. Use the ArcPad software to collect and maintain
GIS and GPS data, and use the GPScorrect extension to connect to, configure, and
control the receiver.
Note – You must have the Trimble GPScorrect extension version 2.40 or later installed on
the field computer for the ESRI ArcPad software to connect to the receiver.
Other GPS field applications
You can use the GPS Pathfinder ProXRT receiver with a custom application developed
using version 2.30 or later of the Trimble GPS Pathfinder Tools Software Development
Kit (SDK).
Configuring the GPS field software to connect to the receiver
The receiver has two physical serial COM ports and three Bluetooth COM ports for
communicating with software on the field computer and with external devices.
COM1 is the serial cable (Lemo) port.
COM2 is the DB9 port. This port is available when the multiport adaptor is connected
to the 26-pin port on the receiver.
COM1, COM2, and the Bluetooth COM ports are standard serial ports that connect to
external devices. You can use any of the COM ports to connect the receiver to
supported GPS field software or to input real-time corrections. For more information,
see Chapter 3, Connecting to Other Equipment.
Using the GPS field software
Connect the GPS Pathfinder ProXRT receiver to a field computer running the GPS field
software and use the software to do some or all of the following:
46
GPS Pathfinder ProXRT Receiver User Guide
4
Configuring the GPS receiver
•
check the current GPS status
•
configure settings such as GPS, real-time correction, and antenna settings
•
configure data logging settings
•
connect to a real-time correction source
•
collect features
•
navigate to existing features
For more information, refer to the rest of this chapter and the documentation for the
GPS field software.
C
CAUTION – Do not use the front panel of the GPS Pathfinder ProXRT receiver to
configure the receiver settings. Any settings you configure are reset the next time you
connect to the receiver from the GPS field software, and using the front panel to
reconfigure settings during data collection may cause problems with your data. To avoid
this issue, always configure the receiver using the GPS field software.
Viewing current GPS status
Use the graphical Skyplot screen or the Satellite Info
screen in the GPS field software to view detailed GPS
and GLONASS information.
Note – To receive signals from GPS and GLONASS
satellites, the antenna must have a clear view of the sky.
GPS positions may not always be available, particularly in
or near buildings, in vehicles, or under tree canopy.
Filled (black) boxes represent satellites that the receiver
is using to compute its current GPS position. Unfilled
(white) boxes represent satellites that the receiver is
getting signals from but is not using because the signals
are too weak. In the example shown here, eight satellites are being tracked and seven of
these satellites are being used to compute GPS positions.
Note – Numbers with no box represent satellites that are available, but that the TerraSync
software is not receiving signals from.
Satellites that have an “R” prefix are GLONASS satellites. These satellites appear only if
the receiver has the GLONASS option installed, and the Use GLONASS option is
enabled in the GPS Settings form. For more information, see Tracking GLONASS
satellites, page 56.
Your current GPS position is displayed at the bottom of the screen.
B
Tip – For detailed information on satellite positions and signal strengths, use the Satellite
information screen in the Status section.
GPS Pathfinder ProXRT Receiver User Guide
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4
Configuring the GPS receiver
To compute a three-dimensional GPS position, you need a minimum of four satellites
with good geometry. When you switch on the receiver, it automatically starts to track
visible satellites and to calculate its current position. If the receiver is computing GPS
positions, the satellite icon in the Status bar and the number beside the icon are solid.
Note – To compute a decimeter-level three-dimensional position using real-time H-Star
technology, the receiver must track at least five satellites that the base station is also
tracking. During dual-constellation operation, when using GPS and GLONASS, the receiver
must track at least six satellites.
Ensuring the accuracy of your GPS data
The GPS Pathfinder ProXRT receiver is a high performance GPS receiver that
calculates very accurate GPS positions.
The list below identifies the most important settings and techniques that you can use
in the field to improve the accuracy of your data:
Note – The list is in order of most important to least important.
48
1.
Use real-time differential corrections. If more than one real-time differential
correction source is available to you, use the one that provides the more
accurate corrections. For more information, see Connecting to an integrated
real-time differential correction source, page 49 and Connecting to an external
differential correction source, page 33.
2.
If you are using TerraSync software to collect data, use accuracy-based logging.
For more information, see page 53.
3.
Configure the GPS settings for the receiver to increase the precision of your data,
and to minimize the effect of atmospheric interference and poor satellite
geometry. For more information, see page 54.
4.
Make sure that the data collection software is configured to log H-Star data, by
default. For more information, see page 54.
5.
Plan GPS data collection around the times of the day when satellite geometry is
best. For more information, see page 55.
GPS Pathfinder ProXRT Receiver User Guide
4
Configuring the GPS receiver
Connecting to an integrated real-time differential correction source
Use a real-time differential correction source to give you better accuracy as you collect
data. For more information on:
•
collecting data using H-Star technology, see Collecting real-time H-Star data,
page 88
•
how real-time differential correction works, see Differential correction
explained, page 88.
The GPS Pathfinder ProXRT receiver has an integrated OmniSTAR receiver and an
integrated SBAS receiver for easy connection to an OmniSTAR differential correction
service (see below) or an SBAS system (see page 52).
Note – To connect to an external real-time differential correction source, such as a VRS
network or GeoBeacon receiver, or to configure the GPS field software to use corrections
from an external real-time differential correction source, see Connecting to an external
differential correction source, page 33.
Using OmniSTAR real-time corrections
The GPS Pathfinder ProXRT receiver can use OmniSTAR differential correction
messages to improve the accuracy and integrity of GPS data. OmniSTAR differential
correction messages provide valid corrections over a large area.
To receive and decode these messages, you must subscribe to an OmniSTAR
differential correction service. Currently, three levels of service are offered:
•
HP (High Performance) achieves better than 10 centimeters
•
XP achieves better than 20 centimeters
•
VBS (Virtual Base Station) achieves sub-meter positioning
Note – To achieve these levels of accuracy, the receiver must be operating within the
coverage footprint of the service.
For phone numbers and information on obtaining a subscription, subscription rates,
and service coverage maps, go to www.omnistar.com.
Once you have a subscription, you must activate the service through an over-the-air
signal.
Activating the OmniSTAR differential service
1.
Connect the receiver to the field computer that is running the GPS field
software. For more information, see Connecting to a field computer, page 27.
2.
Call OmniSTAR and give them:
–
your location ( for example, Sunnyvale, California, USA)
–
the model number and serial number of your GPS Pathfinder ProXRT
receiver (look at the label on the bottom of the receiver)
–
your payment option
GPS Pathfinder ProXRT Receiver User Guide
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4
Configuring the GPS receiver
–
the subscription method. The methods are over-the-air or by manual entry.
Request the over-the-air method.
Note – The receiver must be in an open-air environment and in sight of the appropriate
OmniSTAR satellite to be granted access to the OmniSTAR system.
OmniSTAR gives you the OmniSTAR satellite and frequency information for
your local area.
The service technician advises you of the approximate time when the
subscription will be transmitted. This is usually within 15 minutes. The first
time a receiver is put into service or after a long period of storage, it may take up
to 30 minutes for the receiver to accumulate all the required information from
the OmniSTAR and GPS satellites. The technician can delay the transmission for
a period so that you can put the receiver into service.
3.
In the GPS field software, open the Real-time
section and tap the Setup button .
4.
In the Choice 1 field, select Integrated OmniSTAR.
5.
Tap the Setup button
field.
6.
If you are using a VBS service, select the datum
used by the service in the VBS Correction Datum
field.
7.
From the Name field, select the appropriate
OmniSTAR satellite.
next to the Choice 1
The Frequency and Data Rate fields are
automatically updated.
8.
Tap OK to return to the Real-time Settings screen.
9.
In the Choice 2 field, specify whether to use uncorrected positions, or to stop
using GPS positions, if corrections are not available.
10. Tap OK.
11. Wait up to 45 minutes for the activation process to complete.
Note – If the activation process does not complete within 45 minutes, call OmniSTAR and
report the problem.
Note – The 45-minute wait period is for service activation only. Once the service is
activated, OmniSTAR corrections begin less then 10 seconds after you configure the
receiver to receive them.
You need to activate the subscription only once. However, each time you want to use
real-time corrections from the OmniSTAR service in the field you must connect to the
service (see page 51).
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GPS Pathfinder ProXRT Receiver User Guide
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Configuring the GPS receiver
Connecting to the OmniSTAR differential service
To receive real-time corrections from an OmniSTAR differential service in the field,
make sure that Integrated OmniSTAR is selected in the Choice 1 field of the Real-time
Settings form of the GPS field software (see steps 3 through 8 on page 50).
Once the receiver is connected to the OmniSTAR differential service, the estimated
accuracy of the current position gradually improves to the accuracy specified by the
correction service. This process is referred to as convergence, and the time it takes to
achieve this is referred to as initialization.
The initialization times vary and can take up to 60 minutes, depending on the type of
OmniSTAR service you are connecting to, whether the receiver is moving, and
environmental conditions such as the satellite geometry, multipath and so on.
To check the progress of convergence, use the estimated accuracy value in the status
bar of the GPS field software.
You can also check the current level of service in the Real-time status screen. When
you first connect to the OmniSTAR service, the Service Level field always shows VBS. If
you have subscribed to a higher service level, this field is automatically updated to XP
or HP once that service level is reached.
The receiver must track a minimum of 5 GPS satellites to maintain the solution. If the
receiver loses lock on GPS satellites for less than 3 minutes, the OmniSTAR solution
reinitialises quickly, and you do not have to wait for the OmniSTAR solution to
initialize again. The success rate of re-initialisation depends on the time without GPS
lock, the level of multipath, and the number of satellites available before and after the
loss of lock.
If you disconnect from the OmniSTAR service and do not reconnect within 5 minutes,
you must wait for the OmniSTAR solution to initialize again.
Note – The OmniSTAR VBS service provides submeter positions almost immediately and
no lengthy (re)initialization period is required with VBS.
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4
Configuring the GPS receiver
Using SBAS real-time corrections
The GPS Pathfinder ProXRT receiver can use Satellite Based Augmentation Systems
(SBAS) correction messages to improve the accuracy and integrity of GPS data.
The default SBAS tracking mode is Auto. In Auto mode, the receiver tracks or locks
onto the most powerful satellite signal. The GPS receiver can track two SBAS satellites
at the same time in Auto or Custom mode. It uses corrections from only one SBAS
satellite at a time, but tracking two satellites can improve the availability of SBAS
real-time corrections. For example, if you are working in environments where obstacles
may block the direct line of sight to the SBAS satellite, there is less chance of signal loss
if you are tracking more than one SBAS satellite.
Note – To turn off multiple SBAS satellite tracking, select Custom mode and then deselect
all other SBAS satellites except for the satellite you want to track.
The receiver tracks SBAS satellites according to your geographical location:
•
Wide Area Augmentation System (WAAS) satellites are tracked in the
Continental United States including Alaska, and parts of Canada and Mexico.
•
European Geostationary Navigation Overlay Service (EGNOS) satellites are
tracked in Europe.
•
MTSAT Satellite-based Augmentation System (MSAS) satellites are tracked in
Japan.
You can configure the receiver to use particular SBAS satellites in the Integrated SBAS
Settings form of the Trimble GPS field software. Select the Custom option in the
Tracking Mode field and then enable or disable tracking for any specific satellite.
To use SBAS corrections:
52
1.
Connect the receiver to the field computer that is running the GPS field
software. For more information, see Connecting to a field computer, page 27.
2.
In the GPS field software, open the Real-time
section and then tap the Setup button .
3.
In the Choice 1 field, select Integrated SBAS.
4.
To select particular satellites, tap the Setup
button
next to the Choice 1 field.
5.
Select Custom tracking mode and then enable or
disable tracking of particular satellites.
6.
Tap OK to return to the Real-time Settings screen.
7.
In the Choice 2 field, specify whether to use
uncorrected positions, or to stop using GPS
positions, if corrections are not available.
8.
Tap OK.
GPS Pathfinder ProXRT Receiver User Guide
Configuring the GPS receiver
4
Using accuracy-based logging
If you are using the TerraSync software, use accuracy-based logging to ensure that only
GPS positions that meet the specified estimated accuracy are logged. GPS positions
that do not meet your accuracy requirements are not logged.
Note – Accuracy estimates for streaming (dynamic) GPS positions may not be as good as
those for static GPS positions.
To configure accuracy-based logging in the TerraSync software:
1.
In the Setup section of the TerraSync software, tap Logging Settings. The
Logging Settings form appears.
2.
Tap the Setup button
Settings form appears.
3.
In the Accuracy Value For Display/Logging fields,
select the parameters that will be used to
determine the estimated accuracy:
below the Accuracy Settings field. The Accuracy
–
Select whether to use the horizontal or
vertical accuracy of the current GPS position.
–
Select In the field to use the current
estimated accuracy (recommended if you are
using a real-time correction source), or select
After postprocessing to use the predicted
accuracy that will be achieved after the field
data has been postprocessed.
4.
If you selected After postprocessing, select the
estimated distance to the base station that will be used for postprocessing from
the Postprocessing Base Distance field. If you will use more than one base station
(during H-Star processing), specify the estimated distance to the closest base
station.
5.
Set the Use Accuracy-based Logging field to Yes. The settings fields for
accuracy-based logging appear.
6.
In the Apply Accuracy-based Logging To field, select the feature types that you
want to log only if the GPS positions meet your required accuracy.
7.
In the Required Accuracy field, select the estimated accuracy that is required
before GPS positions are logged.
8.
Tap OK.
Note – Accuracy settings do not affect GPS positions that are used for navigation. GPS
positions are still calculated by the GPS receiver and are available for navigation.
GPS Pathfinder ProXRT Receiver User Guide
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4
Configuring the GPS receiver
Configuring GPS quality settings
Use the GPS Settings form in the GPS field software to configure the GPS quality
settings you require. The lower the GPS quality settings, the more productive you are
likely to be, as the GPS receiver will track more satellites and be better able to calculate
a GPS position. The stricter the GPS quality settings, the more precise the GPS
positions that are calculated.
Note – If you are using the TerraSync software, Trimble recommends that you use
accuracy-based logging to control the quality of the GPS positions logged. Use the default
GPS quality settings and let the TerraSync software manage the logging of positions based
on your required accuracy. For more information, see Using accuracy-based logging,
page 53.
By default, the receiver is configured to receive satellite signals in most conditions.
To open the GPS Settings form, do one of the following:
•
Tap GPS Settings in the Setup section.
•
Tap
in the Skyplot, Satellite Info, or Plan section.
For more information on manually configuring GPS quality settings, refer to the
documentation for the GPS field software.
Logging H-Star carrier data
When you are using a GPS Pathfinder ProXRT receiver,
Trimble GPS field software logs H-Star carrier data by
default. When you log carrier data, the GPS receiver logs
additional data as well as GPS position records. The
additional data is used during postprocessing to improve
the accuracy of the GPS positions.
To check that the software is logging H-Star carrier data:
54
1.
In the Setup section of the GPS field software, tap
Logging Settings. The Logging Settings form
appears.
2.
In the Log Carrier Data field, make sure Auto is
selected and then tap OK.
GPS Pathfinder ProXRT Receiver User Guide
Configuring the GPS receiver
4
Planning a data collection session
To maximize productivity, plan GPS data collection
around the times of the day when satellite geometry is
best. Trimble GPS field software includes a Plan section
with an animated skyplot and DOP (satellite geometry)
graph for your position for the next 12 hours.
In the Plan section, you can check the planning skyplot
as you play a session, then use the timeline to zoom in
on times when geometry is poor. As you adjust GPS
settings, the Plan section is updated, so you can see the
effect of different quality control settings.
Note – The Plan section in the GPS field software does not
show the availability of GLONASS satellites. To plan data
collection sessions using both GPS and GLONASS satellites,
use the office-based Trimble Planning utility. To download this utility, go to
www.trimble.com/planningsoftware_ts.asp and then click the relevant link.
GPS Pathfinder ProXRT Receiver User Guide
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4
Configuring the GPS receiver
Tracking GLONASS satellites
If you purchase the Upgrade to GLONASS option, the receiver can track satellites that
are part of the GLONASS system (GLObal NAvigation Satellite System). Tracking
GLONASS satellites as well as GPS satellites can improve productivity by reducing the
time required to achieve real-time decimeter or subfoot solutions and increasing the
amount of data collected, particularly in tough environments such as around tall
buildings and under heavy tree canopy.
Note – To use GLONASS satellites in the solution, the base station must also be able to
track GLONASS satellites.
To purchase the Upgrade to GLONASS option, contact your Trimble reseller.
After purchase, you must install the Upgrade to GLONASS option onto the receiver
and then configure the GPS field software to use GLONASS satellites.
Installing the Upgrade to GLONASS option
After purchasing the Upgrade to GLONASS option, install the option onto the receiver
using the WinFlash utility and the steps below. For more information, refer to the
WinFlash Help.
The WinFlash utility runs on Windows 95, 98, Windows NT®, 2000, Me, XP, or
Windows Vista® operating systems. The utility is available for download from the
Trimble website.
Downloading the WinFlash utility
1.
Go to the GPS Pathfinder ProXRT receiver technical support page
(www.trimble.com/pathfinderproxrt_ts.asp) and then click Downloads.
2.
Click the WinFlash Utility for vx.xx GPS Firmware link.
3.
The File Download dialog appears. Click Save to save the files to your desktop to
run later.
4.
To install the WinFlash utility onto the computer, browse to the location where
you saved the WinFlash Utility files and then double-click
WFS-ProXRT-v360.exe to start the WinFlash utility.
Installing the Upgrade to GLONASS option onto the receiver
56
1.
Connect one end of the DB9-DB9 cable to the computer. Connect the other end
of the cable to the DB9 socket of the multiport adaptor and then connect the
other end of the adaptor to the 26-pin port on the receiver.
2.
On the computer, click Start / Programs / WinFlash / WinFlash. The Device
Configuration screen appears.
3.
From the Device type list, select your receiver.
4.
From the PC serial port field, select the serial (COM) port on the computer that
the receiver is connected to.
GPS Pathfinder ProXRT Receiver User Guide
4
Configuring the GPS receiver
5.
Click Next.
The Operation Selection screen appears. The Operations list shows all of the
supported operations for the selected device. A description of the selected
operation is shown in the Description field.
6.
Select Update Receiver Options and then click Next.
The GPS Software Selection screen prompts you to select the software that you
want to install on the receiver.
7.
Enter the password for the Upgrade to GLONASS option that you received from
your Trimble reseller.
8.
From the Available Software list, select the latest version and then click Next.
The Settings Review screen prompts you to connect the receiver and lists the
receiver configuration and selected operation.
9.
If all is correct, click Finish.
The Software Upgrade window shows the status of the installation ( for example,
Establishing communication with <your receiver>. Please wait.).
10. Click OK.
The Software Upgrade window shows that the operation was completed
successfully.
11. To select another operation, click Menu; to quit, click Exit.
12. If prompted, click OK to confirm you want to exit the software.
Configuring the GPS field software to track GLONASS satellites
1.
In the Setup section of the GPS field software, tap
GPS Settings. The GPS Settings form appears.
2.
In the Use GLONASS field, make sure that Auto is
selected.
Note – Selecting Auto in this field has no effect if the
Upgrade to GLONASS option is not installed on the GPS
Pathfinder ProXRT receiver.
3.
Tap OK.
Note – When the Auto option is selected, it is possible that
autonomous or real-time corrected positions that were
calculated in the field may fail to be corrected during
postprocessing. This is because positions in the field are calculated using both GLONASS
and GPS measurements, but the postprocessed positions are calculated using GPS
measurements only. If you require every GPS position in the field to have a matching
postprocessed position in the office, select No in the Use GLONASS field.
GPS Pathfinder ProXRT Receiver User Guide
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4
58
Configuring the GPS receiver
GPS Pathfinder ProXRT Receiver User Guide
CHAPTER
5
Configuring the Receiver Using the
Web Browser Interface
In this chapter:
Q
Configuring Ethernet settings
Q
Configuring the receiver using a
web browser
Q
Menus
5
You can configure the ProXRT receiver via the
Web Browser interface. The Web Browser
interface provides an easy way to configure
NMEA Output settings.
This chapter explains the Web Browser interface
menu options.
Note – If you are using Trimble field software, the
field software settings will override most receiver
settings. Trimble recommends that you configure
the receiver using the Web Browser interface only if
you are not using Trimble field software.
GPS Pathfinder ProXRT Receiver User Guide
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5
Configuring the Receiver Using the Web Browser Interface
Configuring Ethernet settings
The receiver has an Ethernet port so that the receiver can connect to an Ethernet
network. You can use the Ethernet network to access, configure, and monitor the
receiver. No serial cable connection to the receiver is necessary.
The receiver requires the following Ethernet settings:
•
IP setup: Static or DHCP
•
IP address
•
Netmask (Submask)
•
Broadcast IP address
•
Gateway IP address
•
DNS IP address
•
HTTP port
The default setting for the HTTP port is 80. The HTTP port is not assigned by the
network. HTTP port 80 is the standard port for web servers. This allows you to connect
to the receiver by entering only the IP address of the receiver in a web browser. If the
receiver is set up to use a port other than 80, you will need to enter the IP address
followed by the port number in a web browser.
Example of connecting to the receiver using port 80: http://169.254.1.0
Example of connecting to the receiver using port 4000: http://169.254.1.0:4000
The default setting of the receiver is DHCP enabled. Using DHCP enables the receiver
to automatically obtain the IP address, Netmask, Broadcast, Gateway, and DNS
address from the network.
When a receiver is connected to a network
using DHCP, the network assigns an IP address
to the receiver. To verify the IP address, select
the up button from the keypad when the Home
screen is displayed. The Ethernet IP address
appears. The screen shown is of a receiver that has failed to get a network assigned IP
address.
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GPS Pathfinder ProXRT Receiver User Guide
5
Configuring the Receiver Using the Web Browser Interface
Configuring the receiver using a web browser
This section describes how to configure the receiver using the web browser. The web
browser requires a computer running a web browser. The computer must be
connected to the receiver in one of the following ways:
•
Peer-to-peer using Ethernet cross-over cable or Bluetooth wireless technology
•
Through a Local Area Network (LAN)
•
Through the Internet
Supported browsers
•
Google Chrome
•
Microsoft Internet Explorer® version 6.00 or later for Windows operating
systems
•
Mozilla Firefox version 1.07 or later (version 1.50 or later is recommended for
Windows, Macintosh, and Linux operating systems)
Connecting to the receiver using a web browser
1.
Enter the IP address of your receiver (see Configuring Ethernet settings, page 60)
into the address bar of the web browser as shown:
2.
If security is enabled on the receiver, the web browser prompts you to enter a
username and password:
The default login values for the receiver are:
–
User Name: admin
–
Password: password
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5
Configuring the Receiver Using the Web Browser Interface
If you cannot connect to the receiver, the password for the admin account may
have been changed, or a different account may be in use. Contact your receiver
administrator for the appropriate login information.
Connecting to the receiver using a web browser and Bluetooth wireless
technology
This section describes how to access the web interface on a ProXRT receiver that has
firmware version 3.60 or later installed, using Bluetooth wireless technology on an
office computer that has Service Pack 2 of the Windows XP operating system
(Professional Edition) installed.
62
1.
On the office computer, open the Control Panel. Open Bluetooth Configuration
and go to the Client Applications tab. The following dialog appears:
2.
Add at least one Bluetooth Serial port. To do this, click Add COM port and then
follow the steps through the wizard. Name the COM port appropriately and
clear the Secure Connection check box.
GPS Pathfinder ProXRT Receiver User Guide
Configuring the Receiver Using the Web Browser Interface
5
3.
Start the Bluetooth Setup wizard (click Start / All Programs / My Bluetooth Places):
4.
The Bluetooth Setup wizard starts. Use the settings shown below and then click
Next:
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5
Configuring the Receiver Using the Web Browser Interface
The following dialog appears:
64
5.
Select the Bluetooth serial port you created and then click Next. The following
dialog appears:
6.
In the Search criteria list, change the search to Show all devices and then select
the GPS receiver that you want to connect to. Click Next.
GPS Pathfinder ProXRT Receiver User Guide
Configuring the Receiver Using the Web Browser Interface
5
The following dialog appears:
7.
Click Configure to select the COM port on your office computer. Think of
Bluetooth as a cable replacement and this as the serial port on your office
computer into which the Bluetooth ‘cable’ will be connected. The following
dialog appears:
8.
Ensure that the Secure Connection check box is cleared and then tap OK.
9.
Tap Finish. The new Bluetooth connection appears in My Bluetooth places.
GPS Pathfinder ProXRT Receiver User Guide
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Configuring the Receiver Using the Web Browser Interface
10. Double-click this icon to connect:
Creating a new connection
1.
66
From your Windows Control Panel, open Network Connections and then click
Create a new connection :
GPS Pathfinder ProXRT Receiver User Guide
Configuring the Receiver Using the Web Browser Interface
2.
3.
5
The New Connection wizard starts. Complete the wizard using the following
settings:
–
Set up an advanced connection
–
Connect directly to another computer
–
Guest
Give the connection a name which relates to the COM port being used on the
office computer. This is like a cable connection between two computers only the
cable is being replaced by a Bluetooth wireless connection. Tap Next. The
following dialog appears:
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Configuring the Receiver Using the Web Browser Interface
4.
Select the correct COM port from the list and then tap Next. The following
dialog appears:
5.
Enter the user name and password and then click Connect.
The defaults for the ProXRT receiver are:
Username: admin
Password: password
6.
68
The new Direct connection appears in the Network Connections folder. If that
status shows as Connected, you can continue to the web interface.
GPS Pathfinder ProXRT Receiver User Guide
5
Configuring the Receiver Using the Web Browser Interface
B
7.
Right-click on the connection and select Status:
8.
The Details tab shows the Server IP address. Use this IP to connect to the
receiving using the web interface.
Tip – You can also get the PPP address from the front panel of the receiver by pressing J
from the Home screen.
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Configuring the Receiver Using the Web Browser Interface
Menus
Once you are logged in, the home page appears (see Figure 5.1).
Serial number of receiver
Model name of receiver
Available
languages
Menus
Figure 5.1
ProXRT receiver Home page
Changing the settings
Use the webpage to configure the receiver settings. The web interface shows the
configuration menus on the left of the browser window, and the settings on the right.
Each configuration menu contains related submenus to configure the receiver and
monitor receiver performance.
Note – The configuration menus available vary based on the version of the receiver.
A summary of each configuration menu is provided here. For more detailed
information about each of the receiver settings, select the Help menu. The Help is
available whenever your computer is connected to the Internet. It is also available
anytime from the Trimble website (link available in the Help section of the web
interface).
To display the web interface in another language, click the corresponding country flag.
The web interface is available in the following languages:
•
•
•
•
•
70
English (en)
Chinese (zh)
Dutch (nl)
Finnish ( fi)
French ( fr)
GPS Pathfinder ProXRT Receiver User Guide
•
•
•
•
•
Japanese (ja)
Norwegian (n)
Polish (pl)
Russian (ru)
Spanish (es)
Configuring the Receiver Using the Web Browser Interface
• German (de)
• Italian (it)
5
• Swedish (sv)
Receiver Status menu
The Receiver Status menu provides a quick link to review the receiver’s available
options, current firmware version, IP address, temperature, runtime, satellites tracked,
current outputs, available memory, position information, and more.
This figure shows an example of the screen that appears when you select Receiver
Status / Identity.
GPS Pathfinder ProXRT Receiver User Guide
71
5
Configuring the Receiver Using the Web Browser Interface
Satellites menu
Use the Satellites menu to view satellite tracking details and enable/disable GPS and
SBAS (WAAS/EGNOS and MSAS) satellites.
This figure shows an example of the screen that appears when you select Satellite /
Tracking (Sky Plot).
72
GPS Pathfinder ProXRT Receiver User Guide
Configuring the Receiver Using the Web Browser Interface
5
Receiver Configuration menu
Use the Receiver Configuration menu to configure such settings as elevation mask and
PDOP mask, the antenna types and height, the heading and attitude adjustments and
calibration and management of the stored configurations (Appfiles).
This figure shows an example of the screen that appears when you select Receiver
Configuration / Summary.
GPS Pathfinder ProXRT Receiver User Guide
73
5
Configuring the Receiver Using the Web Browser Interface
I/O Configuration menu
Use the I/O Configuration menu to set up all outputs of the receiver. The receiver can
output CMR, RTCM, NMEA, GSOF, or BINEX messages. These messages can be output
on TCP/IP, NTRIP, UDP, serial, Bluetooth, or radio ports.
This figure shows an example of the screen that appears when you select
I/O Configuration / Port Summary.
To configure the required NMEA options, select the Port Configuration option, or click
on the required port (Type) on the above screen. The following screen appears:
74
GPS Pathfinder ProXRT Receiver User Guide
5
Configuring the Receiver Using the Web Browser Interface
1.
Select the required port from the drop-down menu.
2.
Select NMEA from the protocol drop-down menu.
Your Serial Port Setup values will depend on your third-party software.
3.
Set the NMEA options as required, click OK.
See Appendix C: NMEA-0183 Output for details of the message formats.
Bluetooth menu
Use the Bluetooth menu to configure the receiver to connect to other devices that use
Bluetooth wireless technology. These devices can be used to configure the receiver, and
generate or receive corrections. The following Trimble devices can be connected to an
ProXRT receiver using Bluetooth wireless technology:
•
Laptop computer
•
Other Bluetooth-enabled GPS receivers
This figure shows an example of the screen that appears when you select Bluetooth /
Info.
GPS Pathfinder ProXRT Receiver User Guide
75
5
Configuring the Receiver Using the Web Browser Interface
OmniSTAR menu
All receivers can receive OmniSTAR corrections. By default, OmniSTAR tracking is
turned off in the receiver. To receive OmniSTAR corrections, you must enable the
receiver to track OmniSTAR satellites and it must have a valid OmniSTAR subscription.
To purchase a subscription for your receiver, contact OmniSTAR at:
www.OmniSTAR.com
North & South America, 1-888-883-8476 or 1-713-785-5850
Europe & Northern Africa, 31-70-317-0900
Australia & Asia, 61-8-9322 5295
Southern Africa, 27 21 552 0535
This figure shows an example of the screen that appears when you select OmniSTAR /
Summary.
76
GPS Pathfinder ProXRT Receiver User Guide
5
Configuring the Receiver Using the Web Browser Interface
Network Configuration menu
Use the Network Configuration menu to configure Ethernet settings, email alerts, PPP
connection, HTTP port, FTP port, Dynamic DNS, and VFD port settings of the receiver.
For information on the Ethernet settings, see Configuring Ethernet settings, page 60.
The VFD port allows you to use the ProXRT Remote Control application to view and
navigate the receiver through a mock display and keypad interface. To allow the
ProXRT Remote Control to connect to the receiver, you need to enable the VFD port.
To do this, select Network Configuration / VFD.
This figure shows an example of the screen that appears when you select Network
Configuration / Ethernet.
GPS Pathfinder ProXRT Receiver User Guide
77
5
Configuring the Receiver Using the Web Browser Interface
Security menu
Use the Security menu to configure the login accounts for all users who will be
permitted to configure the receiver using a web browser. Each account consists of a
username, password, and permissions. Administrators can use this feature to limit
access to other users. Security can be disabled for a receiver. However, Trimble
discourages this as it makes the receiver susceptible to unauthorized configuration
changes.
This figure shows an example of the screen that appears when you select Security /
Configuration.
78
GPS Pathfinder ProXRT Receiver User Guide
5
Configuring the Receiver Using the Web Browser Interface
Firmware menu
Use the Firmware menu to verify the current firmware and load new firmware to the
receiver. You can upgrade firmware across a network or from a remote location
without having to connect to the receiver with a serial cable.
This figure shows an example of the screen that appears when you select Firmware.
GPS Pathfinder ProXRT Receiver User Guide
79
5
Configuring the Receiver Using the Web Browser Interface
Help Menu
The Help menu provides information on each of the receiver settings available in a web
browser. Selecting the Help menu opens new windows. Select the section of the Help
that you want to view.
To access the Help, your computer must be connected to the Internet. If you do not
have access to the Internet, there is also a copy of the receiver Help files on the Trimble
SPS GPS Receiver CD. (This copy shows the Help files as they were when the CD was
published.)
This figure shows the screen that appears when you select Help, then Identity under
Receiver Status.
80
GPS Pathfinder ProXRT Receiver User Guide
CHAPTER
6
Troubleshooting
In this appendix:
Q
Receiver issues
Q
Connection issues
Q
GLONASS satellite tracking issues
Q
Postprocessing issues
6
Use this section to identify and solve common
problems that may occur with the receiver.
Please read this section before you contact
Technical Support.
GPS Pathfinder ProXRT Receiver User Guide
81
6
Troubleshooting
Receiver issues
Issue
Possible cause
Solution
The receiver does
not turn on.
External power is too low. Check the charge on the external battery and, if applicable,
check the fuse.
Internal power is too low.
Check the charge on the internal battery.
External power is not
properly connected.
Check that the Lemo connector or 26-pin adaptor is seated
correctly, and that the cable is secured to the receiver.
Check for broken or bent pins in the connector.
Faulty power cable.
Check that you are using the correct cable for the
port/battery.
Check that the correct battery is connected to a particular
port.
The ports on the GPS receiver are optimized for use with
different types of battery. The 26-pin connector is optimized
for Trimble custom external batteries, and the Lemo port is
optimized for external 12 V batteries such as car, motorcycle,
or truck batteries. If the wrong type of battery is connected
to a port, it is likely that it will cut off earlier than normal.
Check pinouts with a multimeter to ensure internal wiring is
intact.
The receiver is not
responding.
The receiver is not
receiving satellite
signals.
The message PC
Loader in Control
Receiver needs a soft
reset.
Turn off the receiver and then turn it back on again.
Receiver needs a full reset. Press E for 35 seconds.
The GPS antenna cable is Make sure that the GPS antenna cable is tightly seated in the
loose.
GPS antenna connection on the GPS antenna.
The cable is damaged.
Check the cable for any signs of damage. A damaged cable
can inhibit signal detection from the antenna at the receiver.
The GPS antenna is not in
clear line of sight to the
sky.
•
The WinFlash utility is in
use.
appears on the front The WinFlash utility was
panel.
started then the data
cable was disconnected.
No apparent reason.
•
Complete the WinFlash task and then exit the utility.
Plug the data cable back in and then restart the receiver.
•
•
82
GPS Pathfinder ProXRT Receiver User Guide
Make sure that the GPS antenna is located with a clear
view of the sky.
Restart the receiver as a last resort (turn off and then turn
it on again).
If the WinFlash utility is not in use, turn off the receiver
using the Power key.
If that does not clear the message, apply external DC
power and hold down the Power key for 60 seconds.
6
Troubleshooting
Connection issues
Issue
Possible cause
Solution
The receiver is not
receiving radio.
Incorrect over-air baud
rates between reference
and rover receivers.
Connect to the radio and then make sure that it has the same
setting as the reference receiver.
Incorrect port settings
between roving external
radio and receiver.
If the radio is receiving data and the receiver is not getting
radio communications, use the Trimble GPS field software to
check that the port settings are correct.
The cable to the external
radio is not correctly
connected.
Make sure that the cable is connected between the external
radio and the receiver.
The port is locked by
previous use.
Reset both the receiver and the other device.
The receiver is not turned
on.
Turn on the receiver and reconnect using the supported
Trimble GPS field software.
The software does not
support the GPS
Pathfinder ProXRT
receiver, or is not the
correct version.
Make sure that you are using the correct software and
version. See Supported GPS field software, page 46.
The baud rate is not set
correctly.
Reset the receiver to the factory default settings. To do this,
press the Power button on the front of the receiver for 35
seconds. The display shows a countdown to turn off the
receiver, another countdown to clear the almanac and
ephemeris and then shows a third countdown time to reset
the receiver. When the third counter reaches 0, release the
Power button.
The receiver will not
connect to a field
computer or to an
external correction
source.
GLONASS satellite tracking issues
Issue
Possible cause
Solution
GLONASS satellites
are not being used
in the real-time
solution.
The base station being
used may not be
GLONASS-capable.
The base station used must be able to receive data from
GLONASS satellites.
The GLONASS option for
the receiver is not
installed.
Contact your Trimble reseller to purchase the upgrade and
then use the WinFlash utility to load the option onto the
receiver.
The Use GLONASS option
in the GPS field software
is disabled.
In the Trimble GPS field software, go to the GPS Settings
form and then select the Use GLONASS option.
GPS Pathfinder ProXRT Receiver User Guide
83
6
Troubleshooting
Postprocessing issues
Issue
Possible cause
Solution
The postprocessed
results differ from
the real-time
corrected results.
GLONASS satellites were
used in real-time but not
during postprocessing.
GLONASS measurements are not used in postprocessing. To
ensure that GLONASS measurements are used in the solution,
use the real-time positions.
To use corrected positions, connect to a real-time differential
correction source.
Accurate real-time
positions were
achieved in the field,
but the data will not
postprocess.
There are not enough
satellites to enable post
processing. This can occur
if GLONASS satellites are
used in the real time
solution.
Use the real time solution. GLONASS satellites cannot be used
in postprocessing.
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GPS Pathfinder ProXRT Receiver User Guide
APPENDIX
A
Understanding GPS
In this chapter:
Q
What is GPS?
Q
What is GLONASS?
Q
Best practice guidelines for
setting up the receiver
Q
Collecting real-time H-Star data
Q
Differential correction explained
A
This section provides a basic introduction to GPS
and associated concepts referred to in this user
guide.
GPS Pathfinder ProXRT Receiver User Guide
85
A
Understanding GPS
What is GPS?
The Global Positioning System (GPS) is a global navigation satellite system (GNSS)
that allows you to calculate your location anywhere in the world using satellite signals.
The GPS system was set up by the United States government and is a constellation of
operational NAVSTAR satellites that orbit the earth every 12 hours. This system
provides worldwide, all-weather, 24-hour time and position information.
Note – To receive signals from GNSS satellites, the antenna must have a clear view of the
sky. GPS positions may not always be available, particularly in or near buildings, in
vehicles, or under tree canopy.
What is GLONASS?
The GLObal NAvigation Satellite System (GLONASS) is a global navigation satellite
system (GNSS) that allows you to calculate your location using satellite signals. The
GLONASS system was developed by the former Soviet Union and is now operated for
the Russian government by the Russian Space Forces. Currently, the Russian
government aims to restore the system to provide global coverage by 2009.
Note – To receive signals from GNSS satellites, the antenna must have a clear view of the
sky. GPS positions may not always be available, particularly in or near buildings, in
vehicles, or under tree canopy.
Best practice guidelines for setting up the receiver
For good receiver operation, observe the following equipment setup guidelines:
86
•
Use the GPS antenna in a location that has a clear line-of-sight to the sky in all
directions. To maximize accuracy and productivity, avoid using the antenna
near vertical obstructions such as buildings, deep cuttings, site vehicles, towers,
or tree canopy. GPS rovers and the base station receive the same satellite signals
from the same satellites. The system needs four common satellites to provide
differentially corrected positions, and five common satellites to provide
decimeter real-time H-Star positions.
•
Place the GPS antenna as high as possible to minimize multipath from the
surrounding area. The receiver must have a clear line-of-sight to the sky at all
times during operation.
GPS Pathfinder ProXRT Receiver User Guide
A
Understanding GPS
•
GPS satellites are constantly moving. Because you cannot measure at a specific
location now does not mean that you will not be able to measure there later,
when satellite coverage at the location improves. Use GPS planning software to
identify the daily best and worst satellite coverage times for your location and
then choose measurement times that coincide with optimal GPS performance.
This is especially important when operating in the worst GPS locations. The
Trimble Planning software is on the GPS Pathfinder ProXRT Receiver User Guide
and Software CD included with the receiver. You can also download the Trimble
Planning software from the Trimble website
(www.trimble.com/planningsoftware_ts.asp).
•
Loss of the satellite signals or loss of the radio link or VRS network connection
results in a loss of decimeter position accuracy.
•
Make sure that the receiver does not lose power. Usually, the receiver is powered
by its internal battery. You cannot change the battery, but the charge normally
lasts for longer than a working day. If you do not use the receiver very often,
ensure that it is charged at least every three months.
•
Do not locate the receiver or antenna within 400 meters (about 1,300 ft) of
powerful radar, television, cellular communications tower, or other transmitters
or GPS antennas. Low-power transmitters, such as those in cellular phones and
two-way radios, normally do not interfere with receiver operations. Cellular
communication towers can interfere with the radio and can interfere with GPS
signals entering the receiver. This does not harm the receiver, but it can prevent
the receiver electronics from functioning correctly.
•
Do not use the rover receiver directly beneath or close to overhead power lines
or electrical generation facilities. The electromagnetic fields associated with
these utilities can interfere with GPS receiver operation. Other sources of
electromagnetic interference include:
–
gasoline engines (spark plugs)
–
televisions and computer monitors
–
alternators and generators
–
electric motors
–
equipment with DC-to-AC converters
–
fluorescent lights
–
switching power supplies
•
If you are using the rover receiver in open spaces, Trimble recommends that you
stop work during electrical storms where the risk of lightning strike is high.
•
Where cables are involved, Trimble recommends that you use cable ties to
secure the cables to the pole or other equipment to avoid inadvertent snagging
while moving about the jobsite. Be careful not to kink, twist, or unnecessarily
extend cables, and avoid trapping them in vehicle doors or windows. Damage to
cables can reduce the performance of GPS equipment.
GPS Pathfinder ProXRT Receiver User Guide
87
A
Understanding GPS
Collecting real-time H-Star data
The GPS Pathfinder ProXRT receiver can be used to collect positions using real-time
H-Star technology, with accuracy varying from decimeter (10 cm) to subfoot (30 cm).
To collect real-time H-Star data, you must:
•
Connect to an external correction source, such as a VRS network, using a
cellular phone, and maintain this link while collecting data. For more
information, see Connecting a Bluetooth-enabled cellular phone for real-time
corrections from an Internet source (including VRS networks), page 34.
•
Use dual-frequency base station(s).
•
When inside the coverage area of a VRS network, or when using a single base
station at a baseline length less than 30 km, the receiver typically achieves
decimeter-level accuracy. At baselines of between 30 km and 80 km, you can
expect accuracy in the subfoot range (30 cm).
•
To obtain a real-time solution with decimeter accuracy using H-Star technology,
the receiver must track at least five satellites that the base station is also
tracking. In a dual-constellation operation, for example GPS and GLONASS, the
receiver must track at least six satellites.
•
To maintain a real-time solution with decimeter accuracy using H-Star
technology, the rover must continuously track at least four satellites that the
base station is also tracking. In a dual-satellite constellation operation, for
example, GPS and GLONASS, the receiver must track at least five satellites. The
radio link between the base and rover receivers must also be maintained.
Differential correction explained
Use differential correction to correct errors in your collected data. Differential
correction requires one or more additional receivers, called base stations or reference
stations, which are located at known points. Data collected at the base stations is used
to determine GPS measurement errors and compute corrections to these errors. An
unlimited number of mobile GPS receivers, called rovers, collect GPS data at unknown
locations within the vicinity of the base station. Errors common at both the base
station and the rover receiver are corrected either in real time or during
postprocessing.
Real-time differential correction
With real-time differential correction, the base station calculates and broadcasts the
error for each satellite as each measurement is received, enabling you to apply
corrections while in the field and collect accurate GPS data. Real-time differential
corrections are available from a variety of public and commercial sources. They can be
generated and broadcast in real-time by privately or self-owned base providers, or by a
wide range of government agencies.
88
GPS Pathfinder ProXRT Receiver User Guide
A
Understanding GPS
Real-time differential correction sources include external beacon and radio sources,
Satellite-Based Augmentation Systems (SBAS) such as WAAS in the US and EGNOS in
Europe, OmniSTAR differential correction services, and VRS networks. SBAS,
OmniSTAR services and VRS networks use multiple reference stations in the network
to calculate the corrections that are then delivered to the receiver from a
Geostationary satellite (SBAS), satellite signal (OmniSTAR) or from a radio or cellular
phone (VRS networks).
Factors that affect real-time corrected accuracy include how often the corrections are
updated, how far you are from the reference station, and whether the coordinate
system used by the correction source matches the coordinate system used by the GPS
receiver.
Postprocessed differential correction
With postprocessed differential correction, the collected GPS data is transferred to an
office computer, and measurements from the reference station are downloaded.
Postprocessing software such as the GPS Pathfinder Office software or the Trimble GPS
Analyst extension for ESRI ArcGIS software is used to differentially correct the
collected data.
Note – If the Use GLONASS option in the GPS field software is enabled, autonomous or
real-time corrected positions that were calculated in the field may fail to be corrected
during postprocessing. This is because positions in the field are calculated using both
GLONASS and GPS measurements, but the postprocessed positions are calculated using
GPS measurements only. If you require every GPS position in the field to have a matching
postprocessed position in the office, either use real-time corrected positions only, or select
No in the Use GLONASS field.
Typically, postprocessed differential correction uses only one base station. However,
when differentially correcting data collected with GPS Pathfinder ProXRT receivers
using H-Star technology, you can select multiple base stations to correct the file
against for improved accuracy.
Factors that affect the accuracy of postprocessed differential correction include the
type of receiver and antenna used at the reference station, the distance between the
base station and the location where the rover data was collected, the accuracy of the
base station position, and the logging interval at the base station.
For more information, refer to the documentation provided with the postprocessing
software.
GPS Pathfinder ProXRT Receiver User Guide
89
A
Understanding GPS
Postprocessed real-time differential correction
If your data files contain autonomous (uncorrected) positions as well as real-time
corrected positions, Trimble recommends that you postprocess the data. During
postprocessing, you can choose whether to correct only autonomous positions, or all
positions. In general, recorrecting positions corrected in real-time will have little effect
on the accuracy of your data.
Note – If the Use GLONASS option in the GPS field software is enabled, autonomous and
real-time corrected positions that were calculated in the field may fail to be corrected
during postprocessing. This is because positions in the field are calculated using both
GLONASS and GPS measurements, but the postprocessed positions are calculated using
GPS measurements only. If you require every GPS position in the field to have a matching
postprocessed position in the office, either use real-time corrected positions only, or select
No in the Use GLONASS field.
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GPS Pathfinder ProXRT Receiver User Guide
APPENDIX
B
China RoHS Information
In this chapter:
Q
Date of manufacture
Q
China RoHS information table
B
This section provides information regarding
China RoHS requirements for the GPS Pathfinder
ProXRT receiver.
GPS Pathfinder ProXRT Receiver User Guide
91
B
China RoHS Information
Date of manufacture
The date of manufacture is coded into the serial number of the GPS Pathfinder ProXRT
receiver.
The serial number structure is YYWWLNNNNN
Where:
•
YY = year of manufacture (Gregorian calendar year minus 1960)
•
WW = week of manufacture (week number)
•
L = manufacturing location
•
NNNNN = sequential number of unit
Example serial number:
4808501234
•
Year of manufacture
4808501234 = 2008
•
Week of manufacture
4808501234 = week number 8
China RoHS information table ( 中国 RoHS 符合性信息表 )
有毒有害物质和元素
(Hazardous substances and elements)
部件名称
Part
铅
汞
Lead (Pb) Mercury
(Hg)
镉
六价铬
Cadmium Chromium VI
Compounds
(Cd)
(Cr6+)
多溴联苯
Polybrominated
Biphenyls
(PBB)
多溴二苯醚
Polybrominated
Diphenyl Ethers
(PBDE)
85340-00
X
O
O
O
O
O
57970-00
X
O
O
O
O
O
58957-02
X
O
O
O
O
O
62546
X
O
O
O
O
O
51695
X
O
O
O
O
O
57168
X
O
O
O
O
O
59043
X
O
O
O
O
O
59046
X
O
O
O
O
O
在友好环境中使用
Environmental
Friendly Use
Period
说明:
O:表示有毒有害物质在该部件所有均质材料中的含量都在 SJ/T11363-2006 标准规定的限量要求以下。
O: Indicates that this toxic or hazardous substance contained in all of the homogeneous materials for this part is below the limit
requirement in SJ/T11363-2006.
X:表示有毒有害物质在该部件至少一种均质材料中的含量超出 SJ/T11363-2006 标准规定的限量要求。
X:Indicates that this toxic or hazardous substance contained in at least one of the homogeneous materials used for this part is above the
limit requirement in SJ/T11363-2006.
92
GPS Pathfinder ProXRT Receiver User Guide
APPENDIX
C
NMEA-0183 Output
In this appendix:
Q
NMEA-0183 message overview
Q
Common message elements
Q
NMEA messages
C
This appendix describes the formats of the
subset of NMEA-0183 messages that are available
for output by the ProXRT receiver when the
NMEA Ouput option is installed.
For a copy of the NMEA-0183 Standard, go to the
National Marine Electronics Association website
at www.nmea.org.
GPS Pathfinder ProXRT Receiver User Guide
93
C
NMEA-0183 Output
NMEA-0183 message overview
When NMEA-0183 output is enabled, a subset of NMEA-0183 messages can be output
to external instruments and equipment connected to the receiver serial ports. These
NMEA-0183 messages let external devices use selected data collected or computed by
the GPS receiver.
All messages conform to the NMEA-0183 version 3.01 format. All begin with $ and end
with a carriage return and a line feed. Data fields follow comma (,) delimiters and are
variable in length. Null fields still follow comma (,) delimiters but contain no
information.
An asterisk (*) delimiter and checksum value follow the last field of data contained in
an NMEA-0183 message. The checksum is the 8-bit exclusive of all characters in the
message, including the commas between fields, but not including the $ and asterisk
delimiters. The hexadecimal result is converted to two ASCII characters (0–9, A–F).
The most significant character appears first.
The following table summarizes the set of NMEA messages supported by the receiver,
and shows the page that contains detailed information about each message.
94
Message
Functions
Page
GGA
Time, position, and fix related data
page 96
GLL
Geographic position; Latitude and Longitude
page 97
GSA
GPS DOP and active satellites
page 98
GST
Position error statistics
page 99
GSV
Number of SVs in view, PRN, elevation, azimuth, and SNR
page 100
HDT
Heading from True North
Not applicable
for this receiver
PTNL,AVR
Time, yaw, tilt, range, mode, PDOP, and number of SVs for
Moving Baseline RTK
Not applicable
for this receiver
PTNL, BPQ
Base station position and position quality indicator
Not applicable
for this receiver
PTNL, DG
L-band corrections and beacon signal strength and related
information
Not applicable
for this receiver
PTNL,GGK
Time, position, position type and DOP values
page 101
PTNL,PJK
Local coordinate position output
Not applicable
for this receiver
PTNL,VGK
Time, locator vector, type and DOP values
Not applicable
for this receiver
PTNL,VHD
Heading Information
Not applicable
for this receiver
RMC
Position, Velocity, and Time
page 102
ROT
Rate of turn
Not applicable
for this receiver
VTG
Actual track made good and speed over ground
page 103
ZDA
UTC day, month, and year, and local time zone offset
page 104
GPS Pathfinder ProXRT Receiver User Guide
NMEA-0183 Output
C
To configure the output of individual NMEA messages, use the receiver’s Web Browser
interface. See Configuring the Receiver Using the Web Browser Interface.
Common message elements
Each message contains:
•
a message ID consisting of $GP followed by the message type. For example, the
message ID of the GGA message is $GPGGA.
•
a comma
•
a number of fields, depending on the message type, separated by commas
•
an asterisk
•
a checksum value
Below is an example of a simple message with a message ID ($GPGGA), followed by 13
fields and a checksum value:
$GPGGA,172814.0,3723.46587704,N,12202.26957864,W,2,6,1.2,18.893,M,25.669,M,2.0,0031*4F
Message values
NMEA messages that the receiver generates contains the following values.
Latitude and longitude
Latitude is represented as ddmm.mmmm and longitude is represented as
dddmm.mmmm, where:
•
dd or ddd is degrees
•
mm.mmmm is minutes and decimal fractions of minutes
Direction
Direction (north, south, east, or west) is represented by a single character: N, S, E, or W.
Time
Time values are presented in Universal Time Coordinated (UTC) and are represented
as hhmmss.cc, where:
•
hh is hours, from 00 through 23
•
mm is minutes
•
ss is seconds
•
cc is hundredths of seconds
NMEA messages
When NMEA-0183 output is enabled, the following messages can be generated.
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NMEA-0183 Output
GGA
Time, Position, and Fix Related Data
An example of the GGA message string is shown below. Table C.1 describes the
message fields.
Note – The following data string exceeds the NMEA standard length.
$GPGGA,172814.0,3723.46587704,N,12202.26957864,W,
2,6,1.2,18.893,M,-25.669,M,2.0,0031*4F
Table C.1
GGA message fields
Field
Meaning
0
Message ID $GPGGA
1
UTC of position fix
2
Latitude
3
Direction of latitude:
N: North
S: South
4
Longitude
5
Direction of longitude:
E: East
W: West
6
GPS Quality indicator:
0: Fix not valid
1: GPS fix
2: Differential GPS fix, OmniSTAR VBS
4: Real-Time Kinematic, fixed integers
5: Real-Time Kinematic, float integers, OmniSTAR XP/HP or Location RTK
7
Number of SVs in use, range from 00 through to 24+
8
HDOP
9
Orthometric height (MSL reference)
10
M: unit of measure for orthometric height is meters
11
Geoid separation
12
M: geoid separation is measured in meters
13
Age of differential GPS data record, Type 1 or Type 9. Null field when DGPS is
not used.
14
Reference station ID, ranging from 0000 through 1023. A null field when any
reference station ID is selected and no corrections are received1.
15
The checksum data, always begins with *
1When
using OmniSTAR services, ID=100 for OmniSTAR VBS, ID=1000 for OmniSTAR HP, and ID=1008
for OmniSTAR XP.
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GPS Pathfinder ProXRT Receiver User Guide
NMEA-0183 Output
GLL
C
Geographic position: Latitude and Longitude
An example of the GLL message string is shown below. Table C.2 describes the
message fields.
$GPGLL,<1>,<2>,<3>,<4>,<5>,<6>*<7><CR><LF>
Table C.2
GLL message fields
Field
Meaning
0
Message ID $GPGLL
1
Latitude 3723.2475 ddmm.mmmm
2
N/S Indicator. N=north or S=south
3
Longitude 12158.3416 dddmm.mmmm
4
E/W indicator E=east or W=west
5
UTC position 161229.487 hhmmss.sss
6
Status. A=data valid or V=data not valid
7
Checksum *2C
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NMEA-0183 Output
GSA
GPS DOP and active satellites
An example of the GSA message string is shown below. Table C.3 describes the
message fields.
$GPGSA,<1>,<2>,<3>,<3>,,,,,<3>,<3>,<3>,<4>,<5>,<6>*<7><CR><LF>
Table C.3
98
GSA message fields
Field
Meaning
0
Message ID $GPGSA
1
Mode 1, M = manual, A = automatic
2
Mode 2, Fix type, 1 = not available, 2 = 2D, 3 = 3D
3
PRN number, 01 through 32 for GPS, 33 to 64 for SBAS, 64+ for GLONASS
4
PDOP-Position dilution of precision, 0.5 through 99.9
5
HDOP-Horizontal dilution of precision, 0.5 through 99.9
6
VDOP-Vertical dilution of precision, 0.5 through 99.9
7
The checksum data, always begins with *
GPS Pathfinder ProXRT Receiver User Guide
NMEA-0183 Output
GST
C
Position Error Statistics
An example of the GST message string is shown below. Table C.4 describes the
message fields.
$GPGST,172814.0,0.006,0.023,0.020,273.6,0.023,0.020,0.031*6A
Table C.4
GST message fields
Field
Meaning
0
Message ID $GPGST
1
UTC of position fix
2
RMS value of the pseudorange residuals; includes carrier phase residuals during
periods of RTK(float) and RTK(fixed) processing
3
Error ellipse semi-major axis 1 sigma error, in meters
4
Error ellipse semi-minor axis 1 sigma error, in meters
5
Error ellipse orientation, degrees from true north
6
Latitude 1 sigma error, in meters
7
Longitude 1 sigma error, in meters
8
Height 1 sigma error, in meters
9
The checksum data, always begins with *
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NMEA-0183 Output
GSV
Satellite Information
The GSV message string identifies the number of SVs in view, the PRN numbers,
elevations, azimuths, and SNR values. An example of the GSV message string is shown
below. Table C.5 describes the message fields.
$GPGSV,4,1,13,02,02,213,,03,-3,000,,11,00,121,,14,13,172,05*67
Table C.5
1 00
GSV message fields
Field
Meaning
0
Message ID $GPGSV
1
Total number of messages of this type in this cycle
2
Message number
3
Total number of SVs visible
4
SV PRN number
5
Elevation, in degrees, 90° maximum
6
Azimuth, degrees from True North, 000° through 359°
7
SNR, 00–99 dB (null when not tracking)
8–11
Information about second SV, same format as fields 4 through 7
12–15
Information about third SV, same format as fields 4 through 7
16–19
Information about fourth SV, same format as fields 4 through 7
20
The checksum data, always begins with *
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NMEA-0183 Output
C
PTNL,GGK
Time, Position, Position Type, DOP
An example of the PTNL,GGK message string is shown below. Table C.6 describes the
message fields.
$PTNL,GGK,453049.0,0,3728.455440850,N,12215.253291068,W,3,9,2.0,EHT35.742
4,M*
Table C.6
PTNL,GGK message fields
Field
Meaning
0
Talker ID $PTNL
1
Message ID GGK
2
UTC time of position fix, in hhmmmss.ss format. Hours must be two numbers,
so may be padded, for example, 7 is shown as 07.
3
UTC date of position fix, in ddmmyy format. Day must be two numbers, so may
be padded, for example, 8 is shown as 08.
4
Latitude, in degrees and decimal minutes (dddmm.mmmmmmm)
5
Direction of latitude:
N: North
S: South
6
Longitude, in degrees and decimal minutes (dddmm.mmmmmmm). Should
contain three digits of ddd.
7
Direction of longitude:
E: East
W: West
8
GPS Quality indicator:
0: Fix not available or invalid
1: Autonomous GPS fix
2: RTK float solution
3: RTK fix solution
4: Differential, code phase only solution (DGPS)
5: SBAS solution – WAAS, EGNOS, MSAS
6: RTK float or RTK location 3D Network solution
7: RTK fixed 3D Network solution
8: RTK float or RTK location 2D in a Network solution
9: RTK fixed 2D Network solution
10: OmniSTAR HP/XP solution
11: OmniSTAR VBS solution
12: Location RTK solution
13: Beacon DGPS
9
Number of satellites in fix
10
Ellipsoidal height of fix (antenna height above ellipsoid). Must start with EHT.
11
M: ellipsoidal height is measured in meters
12
The checksum data, always begins with *
Note – The PTNL,GGK message is longer than the NMEA-0183 standard of 80 characters.
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NMEA-0183 Output
RMC
Position, Velocity, and Time
The RMC string is shown below, and Table C.7 describes the message fields.
$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
Table C.7
Field
1 02
GPRMC message fields
Meaning
0
Message ID $GPRMC
1
UTC of position fix
2
Status A=active or V=void
3
Latitude
4
Longitude
5
Speed over the ground in knots
6
Track angle in degrees (True)
7
Date
8
Magnetic variation in degrees
9
The checksum data, always begins with *
GPS Pathfinder ProXRT Receiver User Guide
NMEA-0183 Output
VTG
C
Track Made Good and Speed Over Ground
An example of the VTG message string is shown below, and Table C.8 describes the
message fields.
$GPVTG,,T,,M,0.00,N,0.00,K*4E
Table C.8
VTG message fields
Field
Meaning
0
Message ID $GPVTG
1
Track made good (degrees true)
2
T: track made good is relative to true north
3
Track made good (degrees magnetic)
4
M: track made good is relative to magnetic north
5
Speed, in knots
6
N: speed is measured in knots
7
Speed over ground in kilometers/hour (kph)
8
K: speed over ground is measured in kph
9
The checksum data, always begins with *
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NMEA-0183 Output
ZDA
UTC Day, Month, And Year, and Local Time Zone Offset
An example of the ZDA message string is shown below, and Table C.9 describes the
message fields.
$GPZDA,172809,12,07,1996,00,00*45
Table C.9
ZDA message fields
Field
Meaning
0
Message ID $GPZDA
1
UTC
2
Day, ranging between 01 and 31
3
Month, ranging between 01 and 12
4
Year
5
Local time zone offset from GMT, ranging from 00 through ±13 hours
6
Local time zone offset from GMT, ranging from 00 through 59 minutes
7
The checksum data, always begins with *
Fields 5 and 6 together yield the total offset. For example, if field 5 is –5 and field 6 is
+15, local time is 5 hours and 15 minutes earlier than GMT.
1 04
GPS Pathfinder ProXRT Receiver User Guide
Glossary
almanac
A file that contains orbit information on all the satellites, clock corrections, and
atmospheric delay parameters. The almanac is transmitted by a GPS satellite to a GPS
receiver, where it facilitates rapid acquisition of GPS signals when you start collecting
data, or when you have lost track of satellites and are trying to regain GPS signals.
The orbit information is a subset of the ephemeris / ephemerides data.
base station
Also called a reference station. A base station is a GPS antenna and receiver positioned
on a known location specifically to collect data for differential correction. Base data
needs to be collected at the same time as you collect data on a rover unit. A base
station can be a permanent station that collects base data for provision to multiple
users, or a rover unit that you locate on known coordinates for the duration of the
datalogging session.
broadcast server
A broadcast server is an Internet server that manages authentication and password
control for differential correction sources such as VRS networks, and relays corrections
from the source that you select. An NTRIP server is an example of a broadcast server.
carrier
A radio wave having at least one characteristic (such as frequency, amplitude, or phase)
that can be varied from a known reference value by modulation.
carrier frequency
The frequency of the unmodulated fundamental output of a radio transmitter. The GPS
L1 carrier frequency is 1575.42 MHz. The L2 carrier frequency is 1227.6 MHz.
carrier phase
Carrier phase is the time taken for the L1 or L2 carrier signal generated by the satellite
to reach the GPS receiver. Measuring the number of carrier waves between the satellite
and receiver is a very accurate method of calculating the distance between them.
cellular modem
A wireless adaptor that connects a laptop computer to a cellular phone system for data
transfer. Cellular modems, which contain their own antennas, plug into a PC Card slot
or into the USB port of the computer and are available for a variety of wireless data
services such as GPRS.
CMR
(Compact Measurement Record)
CMR+
A real-time message format developed by Trimble for broadcasting corrections to
other Trimble receivers. CMR format is a more efficient alternative to RTCM
correction messages, but is not supported by all non-Trimble receivers.
datum
A datum is a mathematical model of the earth’s surface. World geodetic datums are
typically defined by the size and shape of an ellipsoid and the relationship between the
center of the ellipsoid and the center of the earth.
Because the earth is not a perfect ellipsoid, any single datum will provide a better
model in some locations than others. Therefore, various datums have been established
to suit particular regions.
For example, maps in Europe are often based on the European datum of 1950 (ED-50).
Maps in the United States are often based on the North American datum of 1927
(NAD-27) or 1983 (NAD-83).
All GPS coordinates are based on the WGS-84 datum surface.
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Glossary
datum
transformation
A datum transformation defines the method and parameters that are used to
transform the coordinates of a point defined in one datum to coordinates in a different
datum. Trimble software supports several methods of datum transformation including
Seven-Parameter, Three-Parameter (also referred to as Molodensky), and grid-based
transformations. Typically, you use datum transformations to convert data collected in
terms of the WGS-84 datum using GPS methods onto datums used for mapping
purposes in individual regions and countries.
deep discharge
Withdrawal of all electrical energy to the end-point voltage before the cell or battery is
recharged.
differential
correction
Differential correction is the process of correcting GPS data collected on a rover with
data collected simultaneously at a base station. Because the base station is on a known
location, any errors in data collected at the base station can be measured, and the
necessary corrections applied to the rover data.
Differential correction can be done in real time, or by postprocessing after the data has
been collected.
Dilution of Precision. A measure of the quality of GPS positions, based on the geometry
of the satellites used to compute the positions. When satellites are widely spaced
relative to each other, the DOP value is lower, and position accuracy is greater. When
satellites are close together in the sky, the DOP is higher and GPS positions may
contain a greater level of error.
DOP
PDOP (Position DOP) indicates the three-dimensional geometry of the satellites. Other
DOP values include HDOP (Horizontal DOP) and VDOP (Vertical DOP), which
indicate the accuracy of horizontal measurements (latitude and longitude) and
vertical measurements respectively. PDOP is related to HDOP and VDOP as follows:
PDOP2 = HDOP2 + VDOP2
dual-frequency
receiver
A type of receiver that uses both L1 and L2 signals from GPS and GLONASS satellites.
A dual-frequency receiver can compute more precise position fixes over longer
distances and under more adverse conditions because it compensates for ionospheric
delays.
EGNOS
European Geostationary Navigation Overlay Service. A satellite-based augmentation
system (SBAS) that provides a free-to-air differential correction service for GPS.
EGNOS is the European equivalent of WAAS, which is available in the United States.
elevation mask
The angle below which the receiver will not track satellites. Normally set to 10 degrees
to avoid interference problems caused by buildings and trees, atmospheric issues, and
multipath errors.
ellipsoid
An ellipsoid is the three-dimensional shape that is used as the basis for mathematically
modeling the earth’s surface. The ellipsoid is defined by the lengths of the minor and
major axes. The earth’s minor axis is the polar axis and the major axis is the equatorial
axis.
ephemeris /
ephemerides
A list of predicted (accurate) positions or locations of satellites as a function of time. A
set of numerical parameters that can be used to determine a satellite’s position.
Available as broadcast ephemeris or as postprocessed precise ephemeris.
epoch
The measurement interval of a GPS receiver, for example, a GPS position may be
calculated every second.
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GPS Pathfinder ProXRT Receiver User Guide
Glossary
feature
A feature is a physical object or event that has a location in the real world, which you
want to collect position and/or descriptive information about. Features can be
classified as points, lines, or areas. For example, a road sign is a point feature, a road is a
line feature, and a park is an area feature.
field computer
In the GPS Pathfinder ProXRT receiver documentation, a field computer is any
portable computer such as a handheld device, a laptop, or a Tablet PC running the GPS
field software.
firmware
The program inside the receiver that controls receiver operations and hardware.
GLONASS
Global Orbiting Navigation Satellite System. GLONASS is a Soviet space-based
navigation system comparable to the American GPS system. The operational system
consists of 21 operational and 3 non-operational satellites in 3 orbit planes.
GNSS
Global Navigation Satellite System. Types of GNSS include GPS and GLONASS.
GSOF
General Serial Output Format. A Trimble proprietary message format.
HDOP
Horizontal Dilution of Precision. HDOP is a DOP value that indicates the accuracy of
horizontal measurements. Other DOP values include VDOP (vertical DOP) and PDOP
(Position DOP).
Using a maximum HDOP is ideal for situations where vertical precision is not
particularly important, and your position yield would be decreased by the vertical
component of the PDOP ( for example, if you are collecting data under canopy).
H-Star technology
H-Star technology is a Trimble-patented technology allowing the collection of high
accuracy GPS data. A GPS receiver that has H-Star technology logs L1 data or, if used
with an external dual-frequency antenna, logs L1 and L2 data. Real-time H-Star
technology uses corrections from an external source to provide decimeter accuracy in
the field. Postprocessed H-Star technology uses base data from multiple base stations
to obtain better accuracy for the collected data once back in the office.
International
(ITRF)
Terrestrial Reference A reference frame defined by the International Earth Rotation Service (IERS), with its
Frame
origin at the Earth’s center of mass. The WGS-84 datum is aligned with the current
realization of ITRF, ITRF 2000 (also called ITRF00).
L1
The primary L-band carrier used by GPS and GLONASS satellites to transmit satellite
data. The frequency is 1575.42 MHz. It is modulated by C/A code, P-code, or Y-code,
and a 50 bps navigation message.
L2
The secondary L-band carrier used by GPS and GLONASS satellites to transmit
satellite data. The frequency is 1227.6 MHz. It is modulated by P-code or Y-code, and a
50 bps navigation message.
MSAS
MTSAT Satellite-Based Augmentation System. A satellite-based augmentation system
(SBAS) that provides a free-to-air differential correction service for GPS. MSAS is the
Japanese equivalent of WAAS, which is available in the United States.
multipath
Interference, similar to ghosts on an analog television screen, that occurs when GPS
signals arrive at an antenna having traversed different paths. The signal traversing the
longer path yields a larger pseudorange estimate and increases the error. Multiple
paths can arise from reflections off the ground or off structures near the antenna.
NAD-27
North American Datum of 1927. A horizontal datum employing the Clarke 1866
ellipsoid. Height values of this era are expressed in NGVD (National Geodetic Vertical
Datum) of 1929.
GPS Pathfinder ProXRT Receiver User Guide
1 07
Glossary
NAD-83
North American Datum of 1983. A horizontal datum employing the GRS-80 ellipsoid.
The original realization of NAD-83 was almost identical to WGS-84. The current
realization NAD-83 (CORS96) differs from WGS-84 by up to a meter.
NMEA
National Marine Electronics Association. NMEA 0183 defines the standard for
interfacing marine electronic navigational devices. This standard defines a number of
'strings' referred to as NMEA sentences that contain navigational details such as
positions.
NTRIP
(Networked Transport of RTCM via Internet Protocol)
NTRIP enables the streaming of DGPS or RTK correction data via the Internet. Data is
usually received using a modem and/or a cellphone. An NTRIP server is an Internet
server that manages authentication and password control for differential correction
sources including base stations and VRS networks, and relays corrections from the
source that you select. An NTRIP server can be accessed by a number of users at the
same time.
OmniSTAR
The OmniSTAR service allows the use of new generation dual-frequency receivers with
the OmniSTAR service. There are three levels of OmniSTAR service available: VBS
(Virtual Base Station) for sub-meter operations; OmniSTAR XP for consistent
decimeter service (< +/- 20 cms) worldwide; and OmniSTAR HP (High Performance)
for horizontal accuracy better than 10cms. The HP/XP service does not rely on local
reference stations for its signal, but utilizes a global satellite monitoring network.
PDOP
Position Dilution of Precision. PDOP is a DOP value that indicates the accuracy of
three-dimensional measurements. Other DOP values include VDOP (vertical DOP) and
HDOP (Horizontal Dilution of Precision).
Using a maximum PDOP value is ideal for situations where both vertical and
horizontal precision are important.
postprocessing
Postprocessing is the processing of satellite data after it has been collected, in order to
eliminate error. This involves using computer software to compare data from the rover
with data collected at the base station.
real-time differential Also known as real-time differential correction. Real-time differential GPS is the process
GPS
of correcting GPS data as you collect it. Corrections are calculated at a base station and
then sent to the receiver through a radio link. As the rover receives the position it
applies the corrections to give you a very accurate position in the field.
rover
A rover is any mobile GPS receiver that is used to collect or update data in the field,
typically at an unknown location.
RTCM
Radio Technical Commission for Maritime Services. A commission established to
define a differential data link for the real-time differential correction of roving GPS
receivers. There are three versions of RTCM correction messages. All Trimble GPS
receivers use Version 2 protocol for single-frequency real-time differential corrections.
Carrier phase corrections are available on Version 2, or on the newer Version 3 RTCM
protocol, which is available on certain Trimble dual-frequency receivers. The Version 3
RTCM protocol is more compact but is not as widely supported as Version 2.
SBAS
Satellite-Based Augmentation System. SBAS is based on differential GPS, but applies to
wide area (WAAS/EGNOS and MSAS) networks of reference stations. Corrections and
additional information are broadcast via geostationary satellites.
signal-to-noise ratio
SNR. The signal strength of a satellite is a measure of the information content of the
signal, relative to the signal’s noise. The typical SNR of a satellite at 30° elevation is
between 47 and 50 dBHz.
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GPS Pathfinder ProXRT Receiver User Guide
Glossary
skyplot
The satellite skyplot confirms reception of a differentially corrected GPS signal and
displays the number of satellites tracked by the GPS receiver, as well as their relative
positions.
SNR
See signal-to-noise ratio.
SSF
(Standard Storage Format)
A Trimble file format. SSF files store GPS data from a Trimble GPS receiver. Usually
these files have the filename extension .ssf. A corrected SSF file has a .cor or .phs
extension; an SSF file created by importing data has the extension .imp.
tracking
The process of receiving and recognizing signals from a satellite.
UTC
Universal Time Coordinated. A time standard based on local solar mean time at the
Greenwich meridian.
velocity
Velocity is essentially a measure of speed that takes into account direction of travel as
well as the distance traveled over a period of time.
VRS network
A VRS network consists of GPS hardware, software, and communication links. It uses
data from several base stations to provide corrections to roving receivers that are more
accurate than corrections from a single base station.
Unlike other real-time correction sources, using corrections from a VRS network
requires two-way communication between the VRS network and the roving receiver.
The roving receiver must send its position to the server, so that the server can calculate
corrections for that position, and select the closest base station if necessary. The server
generates a unique virtual reference station for each roving receiver that connects to it.
WAAS
Wide Area Augmentation System. WAAS was established by the Federal Aviation
Administration (FAA) for flight and approach navigation for civil aviation. WAAS
improves the accuracy and availability of the basic GPS signals over its coverage area,
which includes the continental United States and outlying parts of Canada and
Mexico.
WGS-84
WGS-84 is an abbreviation for World Geodetic System 1984. WGS-84 has superseded
WGS-72 as the datum used by GPS since January 1987.
The WGS-84 datum is based on the ellipsoid of the same name.
GPS Pathfinder ProXRT Receiver User Guide
1 09
Glossary
1 10
GPS Pathfinder ProXRT Receiver User Guide
Index
Symbols
, (NMEA field delimiter) 94
* (NMEA checksum delimiter) 95
$ (NMEA start of message delimiter) 94
A
AC power adaptor
connecting 18
safety 4
accessories, optional 12
accuracy
estimated 53
improving 48–55, 88–??
predicted 53
required 53
Accuracy Settings form 53
accuracy-based logging 53
Actual Track Made Good Over and Speed Over
Ground message 103
Address field 37
almanac
clearing the 20, 83
defined 105
animated skyplot 55
ArcPad software 46
Australia
notices to users 2
B
backpack 12, 27
Base Position and Quality message, BPQ message 94
base station
defined 88, 105
distance to 53
GLONASS capability 83
satellite tracking 48, 56, 86
transmitting data over Internet 33, 37
using multiple 89
VRS network 33
baseline, moving 94
batteries
extending life of 17
minimum power to charge 17
operating time 16
Bluetooth wireless technology
antenna 19
cellular phone connection 34–36
COM ports 46
DUN service 34
field computer connection 28–30
GeoBeacon connection 39–40, 43
Internet connection 34–38
PAN service 34
regulations 3
VRS network connection 34–38
broadcast server 105
See also NTRIP server
button functions 20
C
Canada
notices to users 2
care of GPS receiver 12
carrier data logging 54
carrier frequency 105
carrier phase
data logging 54
definition 105
cellular modem
definition 105
supported 33
using corrections from 43
cellular phone
connecting to 34–36
for accessing real-time corrections 33
Charger Disabled, Temp Limited message 18
charging
minimum time required 17
charging receiver battery 17
CMR message format 105
connecting to
a Bluetooth-enabled cellular phone 34–36
a field computer 27–32
a GeoBeacon receiver 39–43
a VRS network 34–38
an external radio 41–43
an Internet server 34–38
Connection Control field 38
GPS Pathfinder ProXRT Receiver User Guide
111
Index
Connection Method field 37, 43
Correction Datum field 37, 50
current GPS position 47
Europe
notices to users 2
external power 17
D
F
data collection, planning 48
data logging
accuracy-based 53
H-Star carrier 54
datum
definition 105
of correction source 37, 50
datum transformation 106
deep discharge 106
delimiters, NMEA
checksum 95
field separator 95
start of message 94
DGPS
See differential correction 108
dialling rules 35
Dialup Networking (DUN) service 34
differential correction
definition 106
overview 88
See also postprocessed differential correction
See also real-time differential correction
direction, NMEA field format 95
display 19
DOP
definition 106
graph 55
dual-constellation receiver 48, 88
dual-frequency receiver 10, 106
feature 107
field computer
connecting to 27–32
definition 107
firmware 107
full reset 82
E
EGNOS 52, 106
elevation mask
definition 106
status 21
ellipsoid, definition 106
ephemeris
clearing the 20, 83
defined 106
epoch 106
ESRI ArcPad software 46
estimated accuracy 53
Ethernet settings 60
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GPS Pathfinder ProXRT Receiver User Guide
G
GLONASS satellite tracking 47, 56–57, 83
GNSS 86, 107
GPRS access number 35, 36
GPS
about 45, 85, 91
field software 46
satellite signals 47, 86
viewing status 47
GPS field software
configuring data collection settings 20, 53–55
configuring OmniSTAR correction source 50
configuring SBAS correction source 52
connecting to external correction sources 43
connecting to Internet correction source 37
connecting to receiver 30, 31, 32
connecting to VRS network 37
GLONASS satellite tracking 57
supported 46
GPS Pathfinder ProXRT receiver
accessories 12
button functions 20
components 11
connectors 22
display 19, 21
keypad 19
troubleshooting 82
use and care 12
GPS Pathfinder Tools SDK 46
GPS quality settings 54
GPS Receiver Port field 30, 31, 32
GSA message 97, 98
GSOF 107
GST message 99
GSV message 100
Index
H
H-Star data logging 48, 54
H-Star technology 89, 107
I
installing
GPS field software 46
Upgrade to GLONASS option 56
internal batteries
minimum power to charge 17
operating time 16
ITRF 107
K
keypad 19
L
L1 frequency 107
L2 frequency 107
latitude, NMEA field format 95
limits, imposed by COCOM 13
Lithium-ion battery
charging 17
disposing of 17
safety warning 4, 16
logging
carrier data 54
H-Star data 48
longitude, NMEA field format 95
M
message ID, in NMEA messages 95
messages
Charger Disabled, Temp Limited 18
PC Loader in Control 82
mission planning 55
MSAS 52, 107
multipath 107
N
NAD-27, definition 107
NAD-83, definition 108
navigation using GPS data 53
New Zealand
notices to users 2
NMEA 108
NMEA messages
common elements 95
common message elements 95
delimiters 95
enabling and disabling 95
GGA 96
GSA 97, 98
GST 99
GSV 100
ID 95
PTNL,GGK 101
summary 94
values 95
VTG 103
ZDA 104
notices to users
Australia and New Zealand 2
Canada 2
Europe 2
Taiwan 2
NTRIP server 108
See also broadcast server
O
OmniSTAR
correction status 21
defined 108
integrated receiver 23
levels of service 49
subscription activation 49
using corrections from 50
optional accessories 12
P
Partnership Settings screen 29, 35, 39
passcode 29, 35, 39
PC Loader in Control message 82
Personal Area Networking (PAN) service 34
planning GPS data collection 48, 55
port settings, checking 83
Position Error Statistics message 99
postprocessed differential correction
carrier data 54
GLONASS support 57, 84
overview 90
GPS Pathfinder ProXRT Receiver User Guide
113
Index
troubleshooting 84
postprocessing 89
base distance 53
definition 108
Power button 20
Power LED 19
precision
increasing 48
status 21
precision settings 54
predicted accuracy 53
PTNL,GGK message 101
R
range pole and bracket 12, 26
real-time differential correction
COM ports 46
configuring field software 43
definition 108
external sources 33
OmniSTAR service 49
overview 88
SBAS 49, 52
sources 23, 33
VRS network 33
reference station
See base station
required accuracy 53
reset
full 82
soft 82
rover, definition 108
RTCM, definition 108
skyplot 47, 55, 109
SNR
definition 108
soft reset 82
SSF file format, definition 109
standard components 11
streaming GPS positions 53
support 13, 56
supported GPS field software 46
T
Taiwan
notices to users 2
technical support 13, 56
TerraSync software
installing 46
supported versions 46
three-dimensional GPS position 48
time values in NMEA messages 95
Time, Position, and Fix Related Data message 96
Time, Position, Position Type, DOP message 101
tracking
defined 109
GLONASS satellites 47, 56–57, 83
Trimble GPScorrect extension
installing 46
supported versions 46
troubleshooting
connections 83
GLONASS satellite tracking 83
postprocessing 84
receiver 82
U
S
safety
AC power adaptor 4
battery 4
satellite geometry 55
Satellite Information message 100
SBAS
correction status 21
integrated receiver 23
system locations 52
tracking mode 52
using corrections from 52
Secure Connection check box 29
Select Server form 37
1 14
GPS Pathfinder ProXRT Receiver User Guide
U.S. Department of Commerce 13
Universal Time Coordinated (UTC) See UTC
Upgrade to GLONASS option 10, 12, 56–57
use and care of receiver 13
Use GLONASS field 57
UTC 109
UTC Day, Month, and Year, and Local Time Zone
Offset message 104
UTC, NMEA time values 95
V
Vacuum Fluorescent Display 19
vehicle magnetic mount 12, 27
Index
velocity 109
voltage
minimum required to charge internal
batteries 17
VRS network
address format 37
connecting to 34–38
defined 109
real-time correction source 33
VTG message 103
W
WAAS 52, 109
warnings
AC adaptor 4, 17
battery 4, 16
Web Browser interface 59
WGS-84, definition 109
WinFlash utility 56
Z
ZDA message 104
GPS Pathfinder ProXRT Receiver User Guide
115
Index
1 16
GPS Pathfinder ProXRT Receiver User Guide
NORTH & SOUTH
AMERICA
Trimble Navigation Limited
10355 Westmoor Drive
Suite #100
EUROPE, AFRICA &
MIDDLE EAST
Trimble GmbH
Am Prime Parc 11
65479 Raunheim
ASIA-PACIFIC
Trimble Navigation
Singapore PTE Limited
80 Marine Parade Road
#22-06 Parkway Parade
Westminster, CO 80021
USA
GERMANY
Singapore, 449269
SINGAPORE
www.trimble.com
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