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SPSx51 Modular GPS Receivers User Guide 147
GSOF Messages B
BASE POSITION AND QUALITY INDICATOR
This message describes the base station position and its quality. It is used when the
moving base antenna position and quality are required on one serial port (along with a
heading message) from a receiver in heading mode, typically the SPS551H.
Table B.16 Base position and quality indicator (Type 41 record)
Field Item Type Value Meaning
0 Output record type Char 01h Position time output record
1 Record length Char 0Ah Bytes in record
2–5 GPS time (ms) Long msecs GPS time, in milliseconds of GPS week
6–7 GPS week number Short number GPS week count since January 1980
8 Latitude Double Radians The WGS-84 latitude, in radians, of the
moving base antenna
9 Longitude Double Radians The WGS-84 longitude, in radians, of the
moving base antenna
10 Height Double Meters The WGS-84 height, in meters, of the moving
base antenna
11 Quality indicator Char See Table B.16
The quality of the base station position:
0: Fix not available or invalid
1: Autonomous GPS fix
2: Differential SBAS or OmniSTAR VBS
4: RTK Fixed
5: OmniSTAR XP, OmniSTAR HP, Float RTK,
or Location RTK