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RC4000 ACU Boardset
4.1.10 Azimuth and Elevation Alignment
This step attempts to discover and compensate for offsets in azimuth and elevation position sensing.
Offsets may be introduced due to several factors including mechanical tolerances and slight inaccuracies
in installation. For example, the compass may not be exactly aligned with the azimuth reference position.
The following alignment procedure relies on the fact that is it possible to determine how the dish is
pointing based on the actual antenna angles required to intercept a satellite (at a known longitude) when
the vehicle's latitude and longitude are known.
The following test should be performed as many times as possible. The steps required are:
1) Set the azimuth and elevation offsets to zero.
2) Record the vehicle heading in the following table.
3) Command the ACU to LOCATE a satellite and record the target azimuth and elevation positions
in the CALC'D column.
4) Manually peak the antenna so it's perfectly aligned with the satellite and record the actual angles
in the ACTUAL column.
5) Compute the difference between the target and actual positions.
6) Repeat steps 3-5 for a second satellite.
HDG.
SAT
1
1
2
2
1
2
3
1
2
4
1
2
5
1
2
6
1
2
7
1
2
8
1
2
TOTAL
AVG.
Chapter 4
AZIMUTH
CALC'D
ACTUAL
156
ELEVATION
DIFF.
CALC'D
Support
ACTUAL
DIFF.
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