Linx Technologies RXM-GPS-FM - Manual (Page 10)

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GSV – GPS Satellites in View
Figure 14 contains the values for the following example:
$GPGSV,3,1,12,28,81,285,42,24,67,302,46,31,54,354,,20,51,077,46*73
$GPGSV,3,2,12,17,41,328,45,07,32,315,45,04,31,250,40,11,25,046,41*75
$GPGSV,3,3,12,08,22,214,38,27,08,190,16,19,05,092,33,23,04,127,*7B
GLL – Geographic Position – Latitude / Longitude
Figure 11 contains the values for the following example:
$GPGLL,2503.6319,N,12136.0099,E,053740.000,A,A*52
GSA – GPS DOP and Active Satellites
Figure 12 contains the values for the following example:
$GPGSA,A,3,24,07,17,11,28,08,20,04,,,,,2.0,1.1,1.7*35
GPS DOP and Active Satellites Example
Name Example Units Description
Message ID $GPGSA GSA protocol header
Mode 1 A See Figure 13
Mode 2 3 1=No fix, 2=2D, 3=3D
ID of satellite used 24 Sv on Channel 1
ID of satellite used 07 Sv on Channel 2
... ...
ID of satellite used Sv on Channel N
PDOP 2.0 Position Dilution of Precision
HDOP 1.1 Horizontal Dilution of Precision
VDOP 1.7 Vertical Dilution of Precision
Checksum *35
End of message termination
Geographic Position – Latitude / Longitude Example
Name Example Units Description
Message ID $GPGLL GLL protocol header
Latitude 2503.6319 ddmm.mmmm
N/S Indicator N N=north or S=south
Longitude 12136.0099 dddmm.mmmm
E/W Indicator E E=east or W=west
UTC Time 053740.000 hhmmss.sss
Status A A=data valid or V=data not valid
Mode A
A=autonomous, D=DGPS, N=Data not
valid, R=Coarse Position, S=Simulator
Checksum *52
End of message termination
Mode 1 Values
Value Description
M Manual – forced to operate in 2D or 3D mode
A Automatic – allowed to automatically switch 2D/3D
GPS Satellites in View Example
Name Example Units Description
Message ID $GPGSV GSV protocol header
Total number of
messages 1
3 Range 1 to 4
Message number 1 1 Range 1 to 4
Satellites in view 12
Satellite ID 28 Channel 1 (Range 01 to 196)
Elevation 81 degrees Channel 1 (Range 00 to 90)
Azimuth 285 degrees Channel 1 (Range 000 to 359)
SNR (C/No) 42 dB–Hz
Channel 1 (Range 00 to 99, null when not
tracking)
Satellite ID 20 Channel 2 (Range 01 to 196)
Elevation 51 degrees Channel 2 (Range 00 to 90)
Azimuth 077 degrees Channel 2 (Range 000 to 359)
SNR (C/No) 46 dB-Hz
Channel 2 (Range 00 to 99, null when not
tracking.
Checksum *73
End of message termination
1. Depending on the number of satellites tracked, multiple messages of GSV data
may be required.
Figure 11: Geographic Position – Latitude / Longitude Example
Figure 12: GPS DOP and Active Satellites Example
Figure 13: Mode 1 Values
Figure 14: GPS Satellites in View Example