RoyalTek | RGM-3000 | RGM-3000/REB-3000 Series Operational Manual

/
Operational Manual
RGM-3000/REB-3000 Series
Operational Manual
Version 1.8
2003/5/15
This document contains information highly confidential to RoyalTek Company LTD (RoyalTek). It
is provided for the sole purpose of the business discussions between supplier and RoyalTek and
is covered under the terms of the applicable Non-Disclosure Agreements. Disclosure of this
information to other parties is prohibited without the written consent of RoyalTek.
Prepared by
RoyalTek Company LTD.
1071, Chung Cheng Rd., Suite 9F-1
Tao Yuan City, Taiwan, R.O.C.
TEL: 886-3-3569666
FAX: 886-3-3560900
E-Mail: sales@royaltek.com
http://www.royaltek.com
RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
RoyalTek GPS Module: RGM-3000/REB-3000 series Operational Manual
INTRODUCTION ......................................................................................................................................... 2
RGM/REB-3000 CONFIGURATION SELECT TABLE ...................................................................................... 2
PRODUCT FEATURES ................................................................................................................................ 2
PRODUCT APPLICATIONS ........................................................................................................................... 3
PRODUCT MODELS.................................................................................................................................... 3
PICTURE.................................................................................................................................................. 4
REB-3000XX02XX............................................................................................................................. 4
REB-3000XX10XX............................................................................................................................. 4
RGM-3000XX00XX............................................................................................................................ 5
REB-3000XX00XX............................................................................................................................. 5
RGM-3000/REB-3000 SERIES SYSTEM BLOCK DIAGRAM .......................................................................... 6
TECHNIQUE SPECIFICATIONS ...................................................................................................................... 7
RGM-3000/REB-3000 Mechanical Layout ......................................................................................... 8
HARDWARE INTERFACE ........................................................................................................................... 13
ABSOLUTE MAXIMUM RATINGS .................................................................................................................. 15
CRITICAL DESIGN GUIDE AND DIAGRAM ...................................................................................................... 15
DESIGN LAYOUT DIAGRAM ...................................................................................................................... 16
NMEA V2.2 PROTOCOL ......................................................................................................................... 17
GGA-Global Positioning System Fixed Data.................................................................................... 18
GLL-Geographic Position – Latitude/Longitude ............................................................................... 18
GSA-GNSS DOP and Active Satellites ............................................................................................ 18
GSV-GNSS Satellites in View .......................................................................................................... 19
RMC-Recommended Minimum Specific GNSS Data....................................................................... 19
VTG-Course Over Ground and Ground Speed................................................................................ 20
GPS Receiver User’s Tip ................................................................................................................. 20
1
RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
RoyualTek GPS Module: RGM-3000/REB-3000 series
Operational Manual
Introduction
RGM-3000/REB-3000 series is the third generation of RoyalTek GPS Receiver. The GPS receiver is
powered by SiRF Star II technology and RoyalTek proprietary navigation algorithm that providing you
more stable navigation data. The miniature design is the best choice to be embedded in a portable
device like PDA, mobile phone, person locator and vehicle locator. It supports TricklePower function
which can be enabled by external command for power saving. The excellent sensitivity of RGM-3000
gets the great performance when going though the urban canyon and foliage.
RGM/REB-3000 Configuration Select Table
RGM/REB
Power Config
I/O Connector
Switch Cable
Ext ANT
F/W Version
F/W Configuration
1
N: Normal
L: Low Power
2
F:FFC
P:Pin type
3
1:SMA
0:None
4
2.Hirose
0:None
5
1.Enhanced
6
1.GGA,GSA,RMC,GSV,4800
(GSV:5 sec/time, others: 1Hz)
RGM-3000 N: Normal
L :Low Power
F:FFC
P:Pin Type
0:None
0: None
1.Enhanced
1.GGA,GSA,RMC,GSV,4800
(GSV:5 sec/time, others: 1Hz)
REB-3000
Product Features
RGM/REB-3000XXXXXX
OEM product development is fully supported through applications engineering and WEB
technique forum.
Small form factor.
12 parallel channels
0.1 second re-acquisition time.
Enhanced algorithm for navigation stability.
NMEA-0183 compliant protocol/custom protocol.
WAAS demodulator
Excellent sensitive for urban canyon and foliage environments.
Single satellite positioning.
Dual multi path rejection.
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
Product applications
RGM-3000/REB-3000
Portable IA device for personal navigation/ position commerce (P-Commerce)
Automotive applications
Personal positioning and navigation
Marine navigation
Timing application
Extendable I/O capability – Provides programming I/O function and development tool kit for
customer
Product models
RGM-3000LXXXXX/REB-3000LXXXXX
Adopt the latest SIRF low power chips (GSP 2e-LP and GRF 2e-LP). Power consumption can be
lowered ro 80mA.
RGM-3000NXXXXX/REB-3000NXXXXX
Adopt the SIRF standard chips (GSP 2e and GRF 2e). Power consumption is 180mA
RGM-3000XFXXXX/REB-3000XFXXXX
RGM/REB-3000 with FPC type I/O connector.(22 pins,)
RGM-3000XPXXXX/REB-3000XPXXXX
RGM/REB-3000 with Pin type I/O connector.(20 pins)
RGM-3000XX00XX
The RGM-3000 is a stamp size GPS receiver with a patch antenna on top of GPS receiver.
REB-3000XXXXXX
REB-3000 provides the external antenna power (2.8DCV ± 5%) through RF cable. There are 3
models for versatile applications:
1) REB-3000XX10XX: with SMA RF cable.
2) REB-3000XX02XX: with 100 mm RF cable and a patch antenna.(RF cable can be customized)
3) REB-3000XX00XX: GPS receiver core module only
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
Picture
REB-3000XX02XX
REB-3000XX10XX
Switch Cable (standard:10cm)
SMA connector
4
RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
RGM-3000XX00XX
REB-3000XX00XX
RF connector (HRS type)
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
RGM-3000/REB-3000 Series System Block Diagram
The RGM-3000/REB-3000 series consists of SiRF star II chipsets technology, RoyalTek LNA and
proprietary software. The system is described as follows.
RGM-3000XX00XX/REB-3000XX01XX
Patch ANT
Flash
Memory
LNA
SIRF
GRF2I
SAW
Filter
RS232 port (TTL) x 2
SiRF
Programming I/O port x 7
GSP2e
Control line x 4
REB-3000XX10XX/REB-3000XX00XX
GPS.receiver w/o patch
ANT.
Flash
LNA
SAW
Filter
RS232 port (TTL) x 2
Memory
SIRF
GRF2I
SiRF
GSP2e
6
Programming I/O port x 7
Control line x 4
RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
≦100mA max.
(3.3volt, w/o ext antenna)
Technique specifications
REB-3000NXXXXX/RGM-3000NXXXXX
RGM-3000/REB-3000 series.
Current ≦180mA typical
Operational Characteristics.
≦200mA max.
12 Channels
(3.3volt, w/o ext antenna)
L1, 1575.42MHz.
Weight. 30g(RGM-3000),15g(REB-3000)
C / A code, 1.023MHz chip rate.
Environment.
Snap start: 3 seconds, 90%
Temperature.
Hot start: 8 seconds, 90%
Operating temperature -40 ~ +85 Degree
Warm start: 38 seconds, 90%
(Celsius).
Cold start: 48 seconds, 90%
Storage temperature: -50 ~ +100 Degree
Reacquisition:0.1 second, typical
(Celsius).
Navigation update rate: Once per second.
Humidity ≦95% noncondensing.
Datum: WGS-84.
GPS Antenna
Specification(REB-3000XX02XX,
Accuracy.
RGM-3000XX00XX)
Position accuracy: ≦ 25m CEP without
Center Frequency: 1575.42±1.023MHz
SA
Bandwidth (-10dB return loss):≧8MHz
Velocity accuracy:0.1 meters/second
Gain at Zenith: 3.0dBi Typ, ≧2dB;
without SA
Gain at 10° elevation :-1.0 dBi Typ,≧-4dB
DGPS Accuracy.
Polarization :R.H.C.P
Position:1 to 5 m, typical
Axial Ratio : 2.0dB max
Velocity: 0.05 meters/second, typical
LNA Specification:(External ANT for
DGPS type
RGM-3000XX02XX )
WAAS, EGNOS, RTCM-104 protocol.
Center Frequency: 1575.42±1.023MHz
Dynamics.
Gain : ≧12dB
Altitude: 18000 meters (60000 feet) Max.
Noise Figure : ≦3dB
Velocity: 515 meters / second Max.
Out Band Attenuation : 7dB min for ±20MHz
Acceleration: 4 g. , Max.
20dB min for ±50MHz
Power Requirements.
30dB min for ±100MHz
The input voltage is 3.3V±10%, ripple ≦
Output V.S.W.R
2.0dB max
Voltage
DC 3.0v±10%
Current
≦15mA
200mV. The power of active antenna is
supplied by RGM-3000/REB-3000 series.
REB-3000LXXXXX/RGM-3000LXXXXX
Current ≦80mA typical
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
Mechanical Layout
RGM-3000/REB-3000 Mechanical Layout
REB-3000XF02XX (FPC Type)
Pin 1
REB-3000XF10XX (FPC Type)
Pin1
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
RGM-3000XF00XX (FPC Type)
Pin1
REB-3000XX00XX (FPC Type)
Pin1
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
REB-3000XP10XX (Pin Type)
Pin19
Pin1
Pin2
Scale: 1.5:1
Pin20
RGM-3000XP00XX (Pin Type)
Pin19
Pin1
A (3 : 1)
Scale: 2:1
Pin2
10
Pin20
RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
REB-3000XP02XX (Pin Type)
Pin1
Pin2
Scale: 1 2 : 1
Dimension for Flexible Flat Circuit & Connector
11
Pin19
Pin20
RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
Dimension for Pin type Connector(male and female):
12
RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
Hardware interface
RGM-3000XFXXXX/REB-3000XFXXXX (FPC Type).
Connector Type:
:FPC, 22 Pin
Pin
NO
Name
I/O
1
VCC
2
VCC
3
4
5
6
TXA
RXA
TXB
RXB
O
I
O
I
7
TIMEMARK
O
8
9
10
11
Reserved
BOOTSEL
Reserved
VBAT
I
I
12
13
RESERVED
GPIO3
14
GPIO5
15
GPIO6
16
GPIO7
17
GPIO10
18
GPIO13
19
GPIO15
20
21
22
GND
GND
GND
Description
Characteristic
System Power
DC 3.3V ± 10%
( Suggested: add an external bypass capacitor.
Value ≧ 2.2uF)
System Power
DC 3.3V ± 10%
( Suggested: add an external bypass capacitor.
Value ≧ 2.2uF)
Navigation Data Output TTL Level;Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Serial Data Input
TTL Level;Vih≧0.7*VCC;Vil≦0.3*VCC
Reserved
TTL Level;Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
RTCM 104 Differential TTL Level;Vih≧0.7*VCC;Vil≦0.3*VCC
GPS Input
1 Pulse per second time Vil≦0.2V,Pulse Width≧10ms
mark Output
Not Used
No connection
Internal boot,Active High TTL Level;Vih≧0.7*VCC;Vil≦0.3*VCC
Reserved
External Backup Power 2.1V≦ Vbat ≦3.6V
Input
I/O General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
I/O General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
I/O General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
I/O General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
I/O General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
I/O General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
I/O General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
System GND
System GND
System GND
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
RGM-3000XPXXXX/REB-3000XPXXXX (PIN Type)
Connector Type:
:20 Pin Header,
,1.27 mm pitch
Pin
NO
Name
I/O
1
VCC
System Power
2
VCC
System Power
3
4
5
6
7
GND
GND
RXA
TXA
RXB
8
9
10
11
TXB
BOOTSEL
Reserved
VBAT
12
13
Reserved
GPIO3
I/O
14
TIMEMARK
O
15
GPIO6
I/O
16
GPIO5
I/O
17
GPIO10
I/O
18
GPIO7
I/O
19
GPIO15
I/O
20
GPIO13
I/O
System GND
System GND
Serial Data Input
TTL Level;Vih≧0.7*VCC;Vil≦0.3*VCC
Navigation Data Output TTL Level;Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
RTCM 104 Differential TTL Level;Vih≧0.7*VCC;Vil≦0.3*VCC
GPS Input
Serial Data Output
TTL Level;Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Internal boot,Active High TTL Level;Vih≧0.7*VCC;Vil≦0.3*VCC
Not used
No connection
External Backup Power 2.1V≦ Vbat ≦3.6V
Input
Not Used
No connection
General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
1 Pulse per second time Vil≦0.2V,Pulse Width≧10ms
mark Output
General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
General Purpose I/O Pin TTL Level;
Output:Voh≧2.4V,Vol≦0.4V;Ioh=Iol=2mA
Input:Vih≧0.7*VCC;Vil≦0.3*VCC
I
O
I
O
I
Description
Characteristic
DC 3.3V ± 10%
( Suggested: add an external bypass capacitor.
Value ≧ 2.2uF)
DC 3.3V ± 10%
( Suggested: add an external bypass capacitor.
Value ≧ 2.2uF)
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
Definition Of Pin assignment
VCC DC Power Input
data to user written software. The default
This is the main power supply for the Engine
setup is NMEA Output, 4800bps, 8 data bits,
board. The power range is from 3.3V±10%,
no parity, 1 stop bit. The default sentences
ripple ≤ 200mV. The maximum current of
are GPGGA, GPGSA, GPRMC once per
RGM-3000 is ≤ 200mA.
second and GPGSV once per 5 seconds.
GND
Please refer to “software interface” for the
GND provides the ground for the Engine
detail protocol.
board. Connect all grounds.
RXA
This is the main receiving channel and is
VBAT
used to receive software commands to the
This is the battery backup supply that
Engine board from user written software.
powers the SRAM and RTC when main
Please refer to “software interface” for the
power is removed. The input voltage level is
detail protocol.
from 2.1V~3.6V. Max current draw is 10 uA
RXB
at 3.3volt. Without an external backup
This is used for DGPS differential input .
battery or on board battery, engine board will
BOOTSEL
execute a cold start after every turn on. To
Pull Bootsel pin high & reset , then it will get
achieve the faster start-up offered by a hot
to boot mode.
or warm start, either a backup battery must
be connected or battery installed on board.
GPIO
TXA
This pin can be programmed to input or
This is the main transmit channel and is
output. For more application, please contact
used to output navigation and measurement
Royaltek’s sales.
Absolute maximum ratings
Parameter
Supply voltage
Output current
Symbol
VCC
Unit
V
MA
Min. Value
2.97
Max. Value
3.63
200
Critical design guide and diagram
1. It is recommanded to attach GNDu plate (30*30MM) below RGM3000 module or the antenna
module of REB-3000XX02XX to increase the intensity of reception . Please refers to “Design Layout
Diagram “ .
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
2. During design of integrated layout, please isolate high frequency noise source (power Switch,data
or address signal lines ) from GPS antenna.
3. Please don’t place metal object above patch antenna.
Design Layout Diagram
Recommanded Ground plate for RGM-3000XF00XX/REB-3000XFXXXX
RGM-3000XF00XX with ground plate
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
Recommanded REB-3000 Antenna Ground Plate
Connector tool (Option, not included in standard kit)
It is used to remove or install FPC on connector.
Software interface
NMEA V2.2 Protocol
GSA, GSV, RMC and VTG.
It is the RS-232 interface:9600 bps, 8 bit
NMEA Output Messages
data, 1 stop bit and no parity. It supports the
The Engine board outputs the following
following NMEA-0183 messages:GGA, GLL,
messages as shown in Table 1:
Table 1 NMEA-0183 Output Messages
NMEA Record
GGA
GLL
GSA
GSV
RMC
VTG
Description
Global positioning system fixed data
Geographic position – latitude / longitude
GNSS DOP and active satellites
GNSS satellites in view
Recommended minimum specific GNSS data
Course over ground and ground speed
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
3723.2475, N, 12158.3416, W, 1,
GGA-Global Positioning System
07, 1.0, 9.0, M, , , ,0000*18
Fixed Data
Table 2 contains the values of the following
example: $GPGGA, 161229.487,
Table 2 GGA Data Format
Name
Message ID
UTC Position
Latitude
N/S Indicator
Longitude
E/W Indicator
Position Fix Indicator
Satellites Used
HDOP
MSL Altitude
Units
Geoid Separation
Units
Age of Diff. Corr.
Diff. Ref. Station ID
Checksum
<CR><LF>
Example
$GPGGA
161229.487
3723.2475
N
12158.3416
W
1
07
1.0
9.0
M
M
Units
meters
meters
meters
meters
second
Description
GGA protocol header
hhmmss.sss
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
See Table 2-1
Range 0 to 12
Horizontal Dilution of Precision
Null fields when DGPS is not used
0000
*18
End of message termination
Table 2-1 Position Fix Indicator
Value
0
1
2
3
Description
Fix not available or invalid
GPS SPS Mode, fix valid
Differential GPS, SPS Mode, fix valid
GPS PPS Mode, fix valid
example:$GPGLL, 3723.2475, N,
GLL-Geographic Position –
12158.3416, W, 161229.487, A*2C
Latitude/Longitude
Table 3 contains the values of the following
Table 3 GLL Data Format
Name
Message ID
Latitude
N/S Indicator
Longitude
E/W Indicator
UTC Position
Status
Checksum
<CR><LF>
Example
$GPGLL
3723.2475
N
12158.3416
W
161229.487
A
*2C
Units
Description
GLL protocol header
ddmm.mmmm
N=north or S=south
Dddmm.mmmm
E=east or W=west
hhmmss.ss
A=data valid or V=data not valid
End of message termination
example:$GPGSA, A, 3, 07, 02, 26,
GSA-GNSS DOP and Active Satellites
27, 09, 04, 15, , , , , , 1.8,1.0,1.5*33
Table 4 contains the values of the following
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
Table 4 GSA Data Format
Name
Message ID
Mode 1
Mode 2
Satellite Used
Satellite Used
….
Satellite Used
PDOP
HDOP
VDOP
Checksum
<CR><LF>
Example
$GPGSA
A
3
07
02
Units
Description
GSA protocol header
See Table 4-2
See Table 4-1
Sv on Channel 1
Sv on Channel 2
….
Sv on Channel 12
Position Dilution of Precision
Horizontal Dilution of Precision
Vertical Dilution of Precision
1.8
1.0
1.5
*33
End of message termination
Table 4-1 Mode 1
Value
1
2
3
Description
Fix not available
2D
3D
Table 4-2 Mode 2
Value
M
A
Description
Manual-forced to operate in 2D or 3D mode
Automatic-allowed to automatically switch 2D/3D
256, 42, 27, 27, 138,
GSV-GNSS Satellites in View
42*71$GPGSV, 2, 2, 07, 09, 23,
Table 5 contains the values of the following
313, 42, 04, 19, 159, 41, 15, 12,
example: $GPGSV, 2, 1, 07, 07, 79,
041, 42*41
048, 42, 02, 51, 062, 43, 26, 36,
Table 5 GSV Data Format
Name
Message ID
Number of Messages1
Messages Number1
Satellites in View
Satellite ID
Elevation
Azimuth
SNR (C/No)
….
Satellite ID
Elevation
Azimuth
SNR (C/No)
Checksum
<CR><LF>
1
Example
$GPGSV
2
1
07
07
79
048
42
27
27
138
42
*71
Units
degrees
degrees
dBHz
degrees
degrees
dBHz
Description
GSV protocol header
Range 1 to 3
Range 1 to 3
Channel 1(Range 1 to 32)
Channel 1(Maximum 90)
Channel 1(True, Range 0 to 359)
Range 0 to 99, null when not tracking
….
Channel 4(Range 1 to 32)
Channel 4(Maximum 90)
Channel 4(True, Range 0 to 359)
Range 0 to 99, null when not tracking
End of message termination
Specific GNSS Data
Depending on the number of satellites
tracked multiple messages of GSV data may
Table 6 contains the values of the following
be required.
example: $GPRMC, 161229.487, A,
3723.2475, N, 12158.3416, W, 0.13,
RMC-Recommended Minimum
309.62, 120598, ,*10
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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
Table 6 RMC Data Format
Name
Message ID
UTC Position
Status
Latitude
N/S Indicator
Longitude
E/W Indicator
Speed Over Ground
Course Over Ground
Date
Magnetic Variation
Checksum
<CR><LF>
Example
$GPRMC
161229.487
A
3723.2475
N
12158.3416
W
0.13
309.62
120598
Units
knots
degrees
degrees
Description
RMC protocol header
hhmmss.sss
A=data valid or V=data not valid
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
True
ddmmyy
E=east or W=west
*10
End of message termination
example:$GPVTG, 309.62, T,
VTG-Course Over Ground and
, M, 0.13, N,
0.2, K*6E
Ground Speed
Table 7 contains the values of the following
Table 7 VTG Data Format
Name
Message ID
Course
Reference
Course
Reference
Speed
Units
Speed
Units
Checksum
<CR><LF>
Example
$GPVTG
309.62
T
Units
degrees
degrees
M
0.13
N
0.2
K
*6E
knots
km/hr
Description
VTG protocol header
Measured heading
True
Measured heading
Magnetic
Measured horizontal speed
Knots
Measured horizontal speed
Kilometer per hour
End of message termination
.
GPS Receiver User’s Tip
1. GPS signal will be affected by weather and environment conditions, thus suggest to use the GPS
receiver under less shielding environments to ensure GPS receiver has better receiving performance.
2. When GPS receiver is moving, it will prolong the time to fix the position, so suggest to wait for the
satellite signals to be locked at a fixed point when first power-on the GPS receiver to ensure to lock
the GPS signal at the shortest time.
3. The following situation will affect the GPS receiving performance:
a.
Solar control filmed windows.
b.
Metal shielded, such as umbrella, or in vehicle.
c.
Among high buildings.
d.
Under bridges or tunnels.
e.
Under high voltage cables or near by radio wave sources, such as mobile phone base
stations.
f.
Bad or heavy cloudy weather.
4. If the satellite signals can not be locked or encounter receiving problem (while in the urban area), the
following steps are suggested:
a. Please plug the external active antenna into GPS receiver and put the antenna on outdoor or the
roof of the vehicle for better receiving performance.
b. Move to another open space or reposition GPS receiver toward the direction with less blockage.
c. Move the GPS receiver away from the interferences resources.
d. Wait until the weather condition is improved.
20
RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
5. While a GPS with a backup battery, the GPS receiver can fix a position immediately at next power-on
if the build-in backup battery is full-recharged.
Contact Information Section
Contact : sales@royaltek.com
HEADQUARTER :
Add : 1071 Chung Cheng Rd., Suite 9F-1
Tao Yuan City , Taiwan , R.O.C.
Tel :886 – 3 - 3569666
Fax :886 – 3 - 3560900
Web Site : www.royaltek.com
Customer Service mail : sales@royaltek.com
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