RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass
HGPS-7
3.3.2.7 GPS Compass Heading
This mode allows the user to observe the true heading generated by the HGPS compass over a period of
time. The ability to monitor the true heading over time should help in predicting the performance of the
HGPS compass installation and calibration.
GPS COMPASS
HDT: 88.5 MAX: 88.9 SEC: 1315
AVG: 88.4 MIN: 88.0 CNT: 1300
BLN: 15
SEC: , CNT: , BLN:
These fields provide statistics on the $GPHDT sentence received from the GPS compass.
The SEC field shows the number of seconds that the mode has been active.
The CNT field shows the number of valid $GPHDT sentences received. When the RC3000 is getting true
heading data from the CSI unit, this number should increase at a similar rate as the SEC field since the
GPS unit is programmed to output $GPHDT at a 1 Hz. rate.
The BLN field shows the number of $GPHDT sentences received that didn't have heading data in them.
This indicates that the GPS unit has developed a lat/lon solution but is unable to develop a correct
heading solution.
HDT:, AVG:
The HDT field shows the latest value received from the $GPHDT sentence.
The AVG field shows the average heading value since the mode started.
MAX:, MIN:
These fields show the maximum and minimum heading values received since the mode started. When
working properly, the spread of values should be no more than 1 or 2 degrees. Shorter baseline lengths
will yield wider value swings than longer baseline lengths.
NOTE: If the antenna array is pointing towards North (0.0), the max and min values may be deceiving
since a value like 359.9 may only indicate an actual swing of 0.2 from a 0.1 reading. It will typically be
best to have the antenna array pointing away from North when running a long term test of the heading
solution.
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