User's Manual

A NMEA-0183 Output
170 Trimble R7/R8 GPS Receiver User Guide
TrimbleR7/R8 GPS Receiver Operation
ST 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
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. Table A.6 describes the message fields.
$GPGSV,4,1,13,02,02,213,,03,-3,000,,
11,00,121,,14,13,172,05*67
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
Table A.6 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