A NMEA-0183 Output
130 Trimble R6/R7 GPS and Trimble R8 GNSS Receivers User Guide
Trimble R6 and R7 GPS/R8 GNSS Receiver Operation
GST Position Error Statistics
An example of the GST message string is shown below. Ta bl e A .4 describes the
message fields.
$GPGST,172814.0,0.006,0.023,0.020,273.6,
0.023,0.020,0.031*6A
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. Tab l e A .5 describes the message fields.
$GPGSV,4,1,13,02,02,213,,03,-3,000,,
11,00,121,,14,13,172,05*67
Table A.4 GST message fields
Field Meaning
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
Table A.5 GSV message fields
Field Meaning
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° to 359°
7SNR, 00
–99 dB (null when not tracking)
8
–11 Information about second SV, same format as fields 4–7
12–15 Information about third SV, same format as fields 4–7
16
–19 Information about fourth SV, same format as fields 4–7
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