RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass
HGPS-4
2.3.8 Navigation Sensor Communication
After connecting the GPS antennas to the RC3000, verify that the units are communicating by observing
data flow via the GPS Serial Port Diagnostics screen described in 3.3.2.6.
2.4.1 Compass Calibration
In order for the compass engine to perform properly, several items describing the installation of the GPS
antenna array will need to be programmed:
1) the distance between the center of the two antennas will need to be measured to within several
millimeters. This value must then be entered into the ANTENNA SEPARATION parameter at the GPS
Compass Calibration screen (3.3.2.9).
NOTE: it may be difficult to determine the center of the round GPS antennas. Measuring between the
edges of the antennas may prove easier.
2) if the level operation situation described in the GPS mounting section does not exist, the LEVEL
OPERATION parameter (3.3.2.9) must be set to NO.
3) if permanent obstructions 10 degrees above the antenna array's horizon exist, the ELEVATION MASK
parameter (3.3.2.9) must be set.
4) the relationship between the direction the antenna array is pointing and the satellite antenna's azimuth
reference direction (AZIM 0.0) must be described to the controller. In the example figure below, the
azimuth reference direction is 90 degrees counterclockwise from the direction of the GPS antenna array.
Enter a value of -90.0 in the fluxgate_offset item on the AZIMUTH CALIBRATION screen (3.3.1.2.3 in
baseline manual).
5) if the GPS antenna array is mounted such that the satellite antenna must be moved to a certain
position before determining heading, the COMPASS item in the SYSTEM DEFINITION screen (3.3.1.2 in
baseline manual) must be set to the "antenna mount" value. If this situation exists, the RC3000 will know
to move the satellite antenna to the deploy position before attempting to read a heading from the GPS
compass.
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