RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass
HGPS-8
3.3.2.9 GPS Compass Calibration
This mode allows the user to program several variables associated with a particular installation of the
HGPS compass.
CSI CAL
CHOOSE PARAMETER TO SET
<1>ANT SEP <2>LEVEL OP <3>TILT AID
<4>EL MASK
When one of the variables is selected for change, the displayed value will be 0 not the actual value
currently stored in the GPS compass. To ensure the desired value is stored, go ahead and enter the
value.
After entering the value, the display will indicate " STORING DATA - REQUIRES 15 SECONDS". During
this time, the RC3000 communicates with the GPS compass and allows the unit to rewrite the parameter
in its memory.
NOTE: when each of the following four fields is entered, the value "0" will be displayed. This does not
represent the current value of the setting.
ANT SEP:
ENTER ANTENNA SEPARATION <500-2000>MM
Enter the distance between the installed antennas. Accuracy to within several millimeters is required.
LEVEL OP:
LEVEL OPERATION <0>NO <1>YES
The programmed value for this item as the GPS compass is supplied will be "YES", indicating that the
antennas are guaranteed to be positioned in a plane within 10 degrees of horizontal.
If level operation cannot be guaranteed, it may take longer to generate a heading solution and there is a
greater possibility of generating an incorrect solution.
TILT AID:
TILT AIDING <0>NO <1>YES
The programmed value for this item as the GPS compass is supplied will be "NO". To be able to program
as "YES", the enclosure must be positioned in the same plane and in the same direction as the antenna
array.
NOTE: RCI does not recommended at this time to set this value to YES.
EL MASK:
ELEVATION MASK <5-60>DEGREES
The programmed value for this item as the GPS compass is supplied will be 10 degrees. It is
recommended that the antenna array be positioned so that both antennas have a clear view of the sky.
The 10 degree default value represents the idea that the signal from any GPS satellite that is less than 10
degrees high will probably be experiencing degradation due to atmospheric refraction effects.
Masking more of the sky eliminates the use of more of the GPS satellite constellation and increases the
chance that no heading solution may be generated.
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