Trimble Outdoors SPSX51 User Manual
Page 124
A NMEA-0183 Output
122 SPSx51 Modular GPS Receivers User Guide
GST
Position Error Statistics
An example of the GST message string is shown below.
describes the
message fields.
$GPGST,172814.0,0.006,0.023,0.020,273.6,0.023,0.020,0.031*6A
Table A.3
GST message fields
Field
Meaning
0
Message ID $GPGST
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
9
The checksum data, always begins with *