User Guide FirstPage.ai

User Guide FirstPage.ai
RX410p
Copyrights
© 2007 TeeJet Technologies Inc. All rights reserved. No part of this document or the computer
programs described in it may be reproduced, copied, photocopied, translated, or reduced in any
form or by any means, electronic or machine readable, recording or otherwise, without prior
written consent from TeeJet Technologies, Inc.
Trademarks
Unless otherwise noted, all other brand or product names are trademarks or registered
trademarks of their respective companies or organizations.
Limitation of Liability
TEEJET TECHNOLOGIES, INC. PROVIDES THIS MATERIAL “AS IS” WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED. NO COPYRIGHT LIABILITY OR PATENT
IS ASSUMED. IN NO EVENT SHALL TEEJET TECHNOLOGIES, INC. BE LIABLE FOR ANY
LOSS OF BUSINESS, LOSS OF PROFIT, LOSS OF USE OR DATA, INTERRUPTION OF
BUSINESS, OR FOR INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
OF ANY KIND, EVEN IF TEEJET TECHNOLOGIES HAS BEEN ADVISED OF SUCH DAMAGES
ARISING FROM TEEJET SOFTWARE.
1801 Business Park Drive, Springfield, Illinois 62703 USA � (217) 753-8424 � www.teejet.com
CHAPTER 1 - INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CABLE INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
EXTERNAL DEVICE CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Serial Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
CHAPTER 2 - OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
LEDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
MAIN MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
DIFFERENTIAL MENUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
CHAPTER 3 - GPS OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
AUTOMATIC TRACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
RECEIVER PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DIFFERENTIAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
AUTOMATIC SBAS (WAAS, EGNOS, MSAS, ETC.) TRACKING . . . . . . . . . . . . . . 19
E-DIF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
L-DIF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
OMNISTAR VBS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
APPENDIX A - TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 21
APPENDIX B - RX410P SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . 23
RX410P i
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ii
CHAPTER 1 - INTRODUCTION
The RX410p is a GPS receiver and antenna system that tracks GPS and SBAS. The high accuracy,
multipurpose receiver is capable of receiving GPS and SBAS signals as well as optional radio beacon. This system is upgradeable to output messages up to 20Hz. The menu system provides easy
system configuration and the status LEDs provide quick updates on the receiver condition. The
Smart Antenna offers an affordable, portable solution with professional level accuracy for agricultural, marine, GIS mapping, and other applications. It provides fast start-up and reacquisition times,
23.6 inch / 60 cm accuracy, and an easy-to-see status indicator for power, GPS, and DGPS. The
durable enclosure houses both antenna and receiver. It can be powered through various sources,
making the Smart Antenna ideal for a variety of applications. Dual-serial, CAN, and pulse output
options make this DGPS receiver compatible with almost any interface.
FEATURES
Receiver
•
Feature-packed sub-23.6 inch / 60cm DGPS positioning
•
Differential options including SBAS (WAAS, EGNOS, etc.), Radio Beacon, OmniSTAR
•
Exclusive e-Dif® option where other differential correction signals are not practical
•
COASTTM technology maintains accurate solutions for 40 minutes or more after loss of
differential signal
•
Fast output rates of up to 20 times per second provide the best guidance and machine
control
•
Compatible with L-DifTM technology for applications requiring accuracy under 7.9 inches /
20cm
•
The status lights and menu system make the receiver easy to monitor and configure
Antenna
•
Affordable solution for unparalleled sub-meter performance - 23.6 in / 60cm accuracy, 95%
of the time
•
COASTTM stability during temporary differential signal outage
•
Exclusive e-Dif® option where other differential signals are not practical
•
Compatible with L-DifTM technology for applications requiring accuracy under 7.9 in / 20cm
•
Fast output rates of up to 20 times per second provide the best visual guidance and
automated steering signals for all types of applications
•
Compact, low-profile design with fixed or magnetic mounting options - ideal for portable
and dynamic applications
•
Radar-simulated pulse output provides accurate ground speed
RX410P 1
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Figure 1-1: Receiver and Antenna
INSTALLATION
Open the shipping box and examine the contents for signs of damage. Please notify the shipper and
TeeJet Customer Support of any damage to the shipping box or its contents immediately. Make sure
all items have been received. Contents may vary depending upon the system ordered. The following
table lists standard components that should arrive with an RX410p system. Please retain the original
invoice and shipping box. These are required if the system needs to be shipped or returned.
2 Chapter 1 - Introduction
Table 1-1: RX410p Components
RX410p System Components
Part Number
Quantity
RX410p Receiver Kit
78-50159
1
Base, Antenna, Magnetic Mount
78-50070
1
Receiver, RX410p
78-50161
1
Antenna, RX410p
78-50162
1
Bracket, RX410p
65-05174
1
Cable, Power, 10ft/3m
45-05132
1
Cable, Antenna, 16.4 ft/5m TNC-TNC
45-05134
1
Cable, Computer Interface
117-0500
1
Manual
98-05099
1
Receiver
It is not necessary to mount the RX410p receiver. However, if mounting is desired, several thumb
screws, nuts, and brackets are provided in the kit. When choosing a mounting location, please
ensure the menu screen, LEDs, and buttons are visible and accessible. Access to the back panel
must be available for switching out cables and accessing the POWER button. There is an option
within the menu system to switch the direction of the display, so if it is easier to mount the unit upside
down, it may be mounted in that position and can still be easily operated.
NOTE: When mounting the receiver, mount the unit inside and away from the elements and in a
location that minimizes vibration, shock, extreme temperatures, and moisture.
Figure 1-2: RX410p Illustration
Antenna
Cable
To Power Source
Cable
Cable
To Device
Receiver
RX410P 3
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To install the brackets for mounting:
1.
Slide the nuts through the openings along the sides of the receiver.
2.
Place the bracket along the receiver and insert the thumbscrews so they screw into the
nuts.
3.
Secure the brackets in the location of choice.
Antenna
Placement of the antenna is crucial to the system’s operation. The GPS engine inside the antenna
computes a position based upon measurements from each satellite to the phase center of the
antenna. Mount the antenna at the desired location of reference. When choosing a mounting location, make certain that there is a clear view of the sky. This will ensure that GPS satellites are not
masked by obstructions, potentially reducing system performance.
Mount the antenna on, or as close to, the center point of measurement of the vehicle. The antenna
can be mounted magnetically, on the vehicle’s surface, or on a pole.
Magnetic Mount
The magnetic mount can be secured by screwing it into the bottom of the antenna and mounting it to
any metal surface. A metal disc and foam adhesive is included with each magnetic mount. Use the
foam adhesive to bond the metal disc to the desired mounting location if there is no metal surface
available. To use the metal disc and foam adhesive:
1.
Clean and dry the mounting surface on the vehicle.
2.
Remove the backing from one side of the foam adhesive and press the metal plate onto the
mounting surface on the vehicle.
3.
Remove the backing from the other side of the foam adhesive.
4.
Press the metal plate onto the mounting surface of the vehicle.
5.
Apply firm pressure to ensure good adhesion.
6.
Place the antenna on top of the metal disc.
Surface Mount
As an alternative to the magnetic mount, the antenna is easily attached to the surface with four
machine screws (not included). To surface mount the antenna:
1.
Photocopy the bottom of the antenna and use it as a template to plan the mounting hole
locations.
WARNING! Make sure the photocopy is scaled ONE TO ONE with the mounting holes on the
bottom of the antenna!
4 Chapter 1 - Introduction
2.
Mark the mounting hole centers as necessary on the mounting surface.
3.
Place the antenna over the marks to ensure that the planned hole centers agree with the
true hole centers. Adjust as necessary.
4.
Use a center punch on the hole centers in order to guide the drill bit.
5.
Drill the mounting holes with a 3/16-inch /4.7625 mm bit appropriate for the surface mount.
6.
Place the antenna over the mounting holes and insert the mounting screws through the
bottom of the mounting surface and into the antenna.
WARNING! Install the antenna only hand-tight. Damage resulting from overtightening the antenna
is not covered by warranty.
Pole Mount
The center thread of the antenna is 5/8 inches / 15.875 mm for compatibility with a survey pole (not
included).
CABLE INTERFACE
The power cable must reach an appropriate power source. The data cable may connect to a data
storage device, computer, or other device that accepts GPS data.
When choosing a route for all of the cables:
•
Avoid running cables in areas of excessive heat
•
Keep cables away from corrosive chemicals
•
Do not run the extension cable through door or window jams
•
Keep the cable away from rotating machinery
•
Do not bend excessively or crimp the cables
•
Avoid placing tension on the cables
•
Remove unwanted slack from the extension cable at the receiver end
•
Secure along the cable route using plastic wrap
WARNING!
Cables improperly installed near machinery can be dangerous.
When connecting the various cables to different devices:
1.
Connect the power cable to the appropriate power source.
2.
Connect the antenna cable from the receiver to the antenna.
3.
Connect the data port(s) to any required device.
EXTERNAL DEVICE CONNECTIONS
The serial ports of the RX410p operate at the RS-232C interface level to communicate with external
data loggers, navigation systems, and other devices. The two serial ports are accessible via the
back panel. The serial ports are accessible by two DB9 female connectors. Either serial port can be
used for firmware updates. Figure 1-3 illustrates the numbering for the DB9 connectors (female).
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Figure 1-3: DB9 Socket Numbering
Note:
For successful communication, the baud rate of the RX410p serial ports must be set to
match that of the devices to which they are connected. Tables 1-2 and 1-3 provide the
pin configuration for the serial ports.
Table 1-2: Port A Pin-Out
6 Chapter 1 - Introduction
Pin Number
Function
1
Not connected
2
Transmit data Port A
3
Receive data Port A
4
Not connected
5
Signal ground
6
Event marker
7
Not connected
8
Not connected
9
1 PPS
Table 1-3: Port B Pin-Out
Pin Number
Function
1
Not connected
2
Transmit data Port B
3
Receive data Port B
4
Not connected
5
Signal ground
6
Not connected
7
Not connected
8
Not connected
9
Not connected
Table 1-4: DGPS Options
DGPS Options
SBAS (WAAS, EGNOS, MSAS, etc.)
e-Dif®
External RTCM
L-Dif®
Table 1-5: Serial Port Settings
Serial Port
Baud Rate
Data Bits
Parity
Stop Bits
Interface Level
Serial Port A
and B
4800
8
None
1
R2-232C
9600
19200
38400
57600
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Table 1-6: GPS Message Output Options
GPS Message
Update Rate
Max DGPS Age
Elevation Mask
GPS Binary
From 1 Hz to 20 Hz
259,200 seconds
5o
NMEA 0183 GGA
From 1 Hz to 20 Hz
259,200 seconds
5o
NMEA 0183 GLL
From 1 Hz to 20 Hz
259,200 seconds
5o
NMEA 0183 GSA
1 Hz
259,200 seconds
5o
NMEA 0183 GST
1 Hz
259,200 seconds
5o
NMEA 0183 GSV
1 Hz
259,200 seconds
5o
NMEA 0183 RMC
1 Hz
259,200 seconds
5o
NMEA 0183 RRE
1 Hz
259,200 seconds
5o
NMEA 0183 VTG
From 1 Hz to 20 Hz
259,200 seconds
5o
NMEA 0183 ZDA
1 Hz
259,200 seconds
5o
Serial Ports
The RX410p features two serial ports. The ports handle communications to and from the receiver
and antenna. The ports may be configured for a mixture of NMEA 0183, binary data, and RTCM SC104 data.
Custom Configuration of the RX410p
All aspects of the RX410p may be configured through the serial port with the use of GPS commands. Many aspects of the receiver may also be configured.
Environmental Considerations
The RX410p receiver is designed to be placed indoors. It is, however, splash proof in case of accidental exposure. The antenna is designed to be used outdoors.
NOTE: The changes made to the RX410p via the serial port will not be saved to memory for subsequent power-up unless a save command is issued ($JSAVE). If changes are made via the
menu system, they are saved automatically.
NOTE: Contact your local TeeJet Technologies dealer for additional information regarding the use
of GPS commands and customized configuration.
8 Chapter 1 - Introduction
CHAPTER 2 - OPERATION
To power up the RX410p:
1.
Connect the ends of the RX410p power cable to a clean power source providing between 8
and 36 VDC. The supplied power should be continuous and clean for best performance.
2.
Turn on the system by pressing the ON/OFF switch on the back panel.
NOTE:
A weather-tight connection and connector is suggested for use if the cable will be
located outside.
WARNING! Be careful not to provide a voltage higher than the input range (36 VDC). This will
damage the receiver and will void the warranty.
WARNING! Do not attempt to operate the RX410p with the fuse bypassed. Such a modification will
void the product warranty.
The RX410p features reverse polarity protection to prevent damage if the power leads are accidently reversed. With the application of power, the RX410p will proceed through an internal start-up
sequence. However, it will immediately be ready for communication.
NOTE:
The initial start-up can take from 5 to 15 minutes depending upon location. Subsequent
start-ups will output a valid position within 1 to 5 minutes depending on location and the
amount of time since the last start-up.
NOTE:
The RX410p can take up to 5 minutes for a full ionospheric map to be received from
SBAS. Optimum accuracy will be obtained once the RX410p is processing corrected
positions using complete ionospheric information.
LEDS
The RX410p uses three LEDs. The LED functions are defined as:
•
Power Indicator LED (red). This LED illuminates when the RX410p is powered.
•
GPS Lock Indicator LED (yellow). This LED remains illuminated with the RX410p achieves
a solid GPS lock.
•
DGPS Position Indicator LED (solid green). This LED remains illuminated in solid green
when the receiver has achieved a differential position and a pseudo range residual of better
than 32.8 feet / 10.0 meters. If the residual value is worse than the current threshold, the
green LED will blink, indicating that differential mode has been attained but that the residual
has not met the threshold.
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MAIN MENU
The menu system of the RX410p is designed for easy setup and configuration in the field or in the
office. Most configuration can be completed entirely through the menu system without having to connect to a computer or PDA. The menu software supports many different languages so individuals
with varied backgrounds can easily understand the configuration of the receiver. If at any time the
menu system needs to be reverted to system default, simply hold down the Enter button and power
on until the splash screen disappears.
The Up and Down Arrow buttons are used to navigate through the menu items. The Enter button is
used to enter into a sub-menu item or select the desired menu option.
Figure 2-1: Main Menu A
Latitude
Longitude
Height
Heading
GPS
Position Status
Velocity
Age of Differential
SV Count
Horizontal Dilution
of Precision
Figure 2-2: Main Menu B
Residual RMS
Sigma-a
Sigma-b
Azimuth
GPS
Sigma latitude
Position Status
(continued)
Precision
Sigma longitude
Sigma altitude
10 Chapter 2 - Operation
Figure 2-3: Main Menu C
Carrier Smoothing
Ephemeris Exists
Ephemeris Healthy
Not Used Previously
GPS
Position Status
(continued)
Navigation
Condition
Above Elevation
Differential Correction
No Differential
Figure 2-4: Main Menu D
DSP:Carrier Lock
DSP:Bit Error Rate
DSP:DSP Lock
DSP: Frame Sync
GPS
Position Status
(continued)
DSP: Track Mode
DSP-ARM
ARM: GPS Lock
ARM: Differential Data
ARM: ARM Lock
ARM: DGPS
ARM: Solution
Figure 2-5: Main Menu E
CH-SV EI (Satellite Elevations)
Satellites
AZ SNR (Satellite Azimuth and
Signal to Noise
GPS (continued)
Elevation Mask
Maximum DGPS Age
Data Port A
Configure
Data Port B
UTC Offset
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Figure 2-6: Main Menu F
Enter Name
Differential Age
Data PORT A
Config Wizard
Proceed Wizard
Data PORT B
Create New
Elevation Mask
Maximum DGPS Age
Port A
Port B
Figure 2-7: Main Menu G
Save to Location
Create New
(Continued)
Save to
Location
Not Used 1
Not Used 2
Not Used 3
Proceed
Wizard
Continued
Not Used 4
Not Used 5
Save Current
Enter Name
Save to Location
Not Used 1
Not Used 2
Not Used 3
Not Used 4
Not Used 5
12 Chapter 2 - Operation
Figure 2-8: Main Menu H
Not Used 1
Not Used 2
Not Used 3
Delete Saved
Not Used 4
Config
Wizard
Continued
Not Used 5
Not Used 1
Display Format
Not Used 2
Not Used 3
Not Used 4
Cancel
Not Used 5
Figure 2-9: Main Menu I
In Use
Other
SwapApplications
Display Apps
System
Setup
Display Update
Use Previous
Latitude and Longitude Units
Height Unit
Velocity Unit
Baud Rates
PORT A
PORT B
RX410P 13
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Figure 2-10: Main Menu J
GGA
GLL
GSA
GST
GSV
System
Setup
(Continued)
RMC
Display Logs
RRE
VTG
ZDA
Bin1
Bin2
Bin80
Bin93
Figure 2-11: Main Menu K
Bin94
Bin95
Display Logs
(Continued)
Bin96
Bin97
Bin98
System
Setup
(Continued)
Bin99
RCTM
RD1
PCSI,1
Software Disp
Menu System
Contrast
Crescent Application
Animation
Serial Number
Subscription
SBX
Flip Display
Language
14 Chapter 2 - Operation
DIFFERENTIAL MENUS
The following figures provide the flowcharts for the differential menus.
Figure 2-12: Differential Menu A
L-Dif
RTCM Port
RTCM Baud
Latitude
Longitude
Base Station
Reference
Height
Set Reference
Use Current Position
RTCM Port
External
RTCM
RTCM Baud
Differential
Figure 2-13: Differential Menu B
BER PRN 1 (Bit Error Rate)
BER PRN 2 (Bit Error Rate)
Ln PRN 1 (Longitude)
SBAS
Signal Status
Ln PRN 2 (Longitude)
Elev PRN 1 (Elevation)
Elev PRN 2 (Elevation)
Az PRN 1 (Azimuth)
Az PRN 2 (Azimuth)
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Figure 2-14: Differential Menu C -1
Mode
Satellites
PRN 1
SBAS
(Continued)
PRN 2
Differential
Figure 2-15: Differential Menu C-2
F (Frequency)
SS SNR (Signal Strength/Signal to Noise Ratio)
Beacon
Signal Status
MPT % Q (Maximum Throughput)
Unselected beacon
ID H
Figure 2-16: Differential Menu D
Africa
Configure
Beacon
(Continued)
Tune
Asia
Auto Tune
Australia
TuneBeaconName
Central America
Europe
North America
South America
Differential
16 Chapter 2 - Operation
Figure 2-17: Differential Menu E
No Differential Source
Autonomous
Differential
Mode
Status
e-Dif
Recalibrate
Age of Differential
Differential
Figure 2-18: Differential Menu F
Signal Status
Frequency
Symbols per seconds
L-Band
Bit Error Rate
Longitude
Elevation
Azimuth
Mode
Configure
Frequency
Latitude and Longitude
RX410P 17
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Figure 2-19: Differential Menu G
Subscription
Start
End
L-Band
(Continued)
Options
Types
L-Band
Library
Source
Enter Code
18 Chapter 2 - Operation
CHAPTER 3 - GPS OVERVIEW
When powered, the GPS engine is always operating, regardless of the DGPS mode of operation.
The following sections describe the general operation of the RX410p’s internal GPS engine.
AUTOMATIC TRACKING
The GPS engine within the RX410p automatically searches for GPS satellites, acquires the signals,
and manages the navigation information required for positioning and tracking. This is a hands-free
mode of operation.
RECEIVER PERFORMANCE
The RX410p works by locating four or more GPS satellites in the visible sky and uses the information those satellites provide to compute an appropriate position (within 16.4 feet / 5 meters). Since
some error is possible in GPS data calculation, the RX410p also tracks a differential source. The
RX410p uses these corrections to improve its position to less than 3.3 feet / 1 meter.
There are two main aspects of GPS receiver performance:
•
Positioning
•
Satellite acquisition quality
The satellites transmit coded information to the antenna on a specific frequency that allows the
receiver to calculate a range to each satellite. GPS is essentially a timing system. The ranges are
calculated by timing how long it takes for the GPS signal to reach the GPS antenna. To calculate the
geographic location, the GPS receiver uses a complex algorithm incorporating satellite locations and
ranges to each satellite. Reception of any four or more of these signals allows a GPS receiver to
compute 3-dimensional coordinates.
DIFFERENTIAL OPERATION
The purpose of differential GPS (DGPS) is to remove the effects of atmospheric errors, timing errors,
and satellite orbit errors while enhancing system integrity. Autonomous positioning capabilities of the
RX410p will result in positioning accuracies of 8.2 feet / 2.5 meters (95%). In order to improve positioning quality to sub-meter levels, the RX410p is able to use differential corrections received
through the internal SBAS demodulator or through software upgrades and subscription code may
also use e-Dif and L-Dif applications.
AUTOMATIC SBAS (WAAS, EGNOS, MSAS, ETC.)
TRACKING
The RX410p will automatically scan and track SBAS signals without the need to tune the receiver.
The RX410p features two-channel SBAS tracking that provides an enhanced ability to maintain a
lock on an SBAS satellite when more than one satellite is in view. This redundant tracking approach
results in more consistent tracking of an SBAS signal when in an area where signal blockage of a
satellite is possible.
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E-DIF
Extended differential (e-Dif) is an optional mode in which the receiver can perform with differentiallike accuracy for extended periods of time without the expense or uncertainty of an external differential service. It models the effects of ionosphere, troposphere, and timing errors for extended periods
by computing its own set of pseudo-corrections. e-Dif may be used anywhere geographically and is
especially useful where SBAS networks have not yet been installed, such as South America, Africa,
Australia, and Asia.
The positioning performance of the receiver unit is dependent upon the rate at which the environmental modeling of e-Dif and the environmental errors diverge. The more that e-Dif is able to model
the errors correctly, the longer that e-Dif will provide reliable, accurate positioning. The accuracy of
positioning will have a very slow rate of drift. It depends on how tolerable the application is to drift
and absolute positioning as e-Dif can be recalibrated regularly or just once at the beginning of its
use. Testing has shown that accuracy will often be better than 3.28 feet / 1.0 meter virtually 95% of
the time for up to 30 minutes of e-Dif operation.
L-DIF
Local differential (L-Dif) is a proprietary GPS method where a specialized set of messages are
relayed between two receivers. Because the messages transmitted are in proprietary format, two
receivers are necessary for local differential operation. A base receiver is established on a site of
known or unknown coordinates, which then broadcasts corrections to a rover unit. Performance testing has resulted in positioning accuracy of less than 7.87 inches / 20 cm.
OMNISTAR VBS
OmniSTAR VBS is a satellite based differential signal. The end user must pay a subscription fee for
access to this signal. The receiver features an automatic mode that allows the receiver to locate the
best spot beam if more than one is available in a particular region. This function frees the user from
having to adjust the frequency of the OmniSTAR DGPS receiver. The OmniSTAR VBS receiver also
features a manual tune mode for flexibility.
20 Chapter 3 - GPS Overview
APPENDIX A - TROUBLESHOOTING
Table A provides a checklist to troubleshoot common problems and their solutions for the RX410p.
Problem
Receiver fails to power
Possible Solution
•
Verify polarity of power leads
•
Check integrity of power cable connections
•
Check power input voltage (8-36 VDC)
•
Check current restrictions imposed by power source (maximum is 250
mA @ 12VDC)
No data from RX410p
•
Press the POWER button
•
Check receiver power status (red LED)
•
Check integrity and connectivity of power and data cable connections
•
The volume of data requested to be output by the RX410p could be
higher than what the current baud rate supports. Try using 19,200 or
higher as the baud rate for all devices.
No GPS lock
No SBAS lock
No beacon lock
No OmniSTAR VBS
lock
•
Check integrity of cable connections
•
Verify antenna’s clear view of the sky
•
Check integrity of cable connections
•
Verify antenna’s clear view of the sky
•
Check SBAS visibility map
•
Check beacon listings to ensure proximity to a beacon station
•
Ensure there are no sources of interference nearby
•
Check antenna connections
•
Verify MSK rate is set correctly
•
Verify frequency of transmitting beacon
•
Select alternate antenna position
•
Subscription activated and not expired?
•
Check antenna connections
•
Verify antenna’s clear view of the sky
RX410P 21
98-05099 R0
22 Appendix A - Troubleshooting
APPENDIX B - RX410P SPECIFICATIONS
Tables B-1 to B-5 provide the power, mechanical, communications, environmental, and DGPS specifications for the RX410p.
Table B-1: Power Specifications
Item
Power Specifications
Input Voltage
8-36 VDC
Power Consumption
< 3 W @ 12 VDC (typical)
Current Consumption
250 mA @ 12 VDC (typical)
Table B-2: Receiver Mechanical Specifications
Item
Power Specifications
Height
1.77 inch / 45 mm
Width
4.49 inch / 114 mm
Length
6.30 inch / 160 mm
Weight
1.19 pound / 0.54 kg
Table B-3: Communication Specifications
Item
Description
Serial Port
2 full duplex RS232
Pulse output
1 PPS (HCMOS, active high, rising edge sync)
Baud rates
4800 - 57600
Differential Correction I/O protocol
RTCM SC-104
Data I/O protocol
NMEA 0183 and Hemisphere GPS binary and RTCM
Event mark output
HCMOS, active low, falling edge sync, 10 k-ohm, 10pF load
Table B-4: Environmental Specifications
Item
Specifications
Operating temperature
-25.6o F to + 165.2o F / -32o C to + 74o C
Storage temperature
-40o F to + 185o F / - 40o C to + 85o C
Humidity
95%, non condensing
RX410P 23
98-05099 R0
Table B-5: GPS Sensor Specifications
Item
Specifications
Receiver type
L1, C/A code with carrier phase smoothing (Patented COAST technology during
differential signal outage)
Channels
12-channel, parallel tracking or 10-channel, GPS, 2-channel, SBAS
Update rate
1-20 Hz
Horizontal accuracy
< 2 feet / 0.6 m 95% confidence (DGPS)*
<8.2 feet / 2.5 m 95% confidence (autonomous) **
Differential Options
SBAS, e-Dif, L-Dif, Radio Beacon, L-Band, Autonomous, External RTCM
SBAS Tracking
2-channel, parallel tracking
Start up time
~ 60 seconds (no almanac and RTC)
Satellite Reacquisition
< 1 second
*
depends on multipath environment, number of satellites in view, satellite geometry, baseline
length (for local services) and ionospheric activity
**
depends on multipath environment, number of satellites in view, satellite geometry and ionospheric activity.
24 Appendix B - RX410p Specifications
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