Trimble R7/R8 GPS Receiver User Guide 177
NMEA-0183 Output A
Trimble R7 and R8
GST Position Error Statistics
An example of the GST message string is shown below. Table A.5
describes the message fields.
$GPGST,172814.0,0.006,0.023,0.020,273.6,
0.023,0.020,0.031*6A
Table A.5 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
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