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RC4600 ACU Board Set
2.1.1.2.2.3.3 Azimuth Scan
The figure shows the movements made to perform an azimuth scanning operation. This operation
enables the RC4600 to try to compensate for any antenna bearing errors.
1) As part of the basic LOCATE movement, the mount will be moved to the target elevation position
and the polarization axis will be moved to the correct orientation.
2) Azimuth Scan moves to the end of the "scan range" that is shortest distance away from the
current azimuth position. Azimuth Scan will begin trying to detect a satellite from this position.
3) Azimuth Scan moves across the "scan range" and samples the lock signal or signal strength for
the current locate source. Note that in order to compensate for any vehicle tilt, occasionally
elevation movements are also made to stay on the target elevation. Note also that the Azimuth
Scan movement may be truncated due to the limits of azimuth movement.
4) After completing the Azimuth Scan, the RC4600 will return the antenna to the "Center of Lock" or
location of peak signal strength.
During the Azimuth Scan, line 4 of the display will provide information on what step of the locate is
currently being performed. In the display below, the RC4600 is currently "SCANNING AZIM FOR LOCK".
A Z :
E L :
S C A N N I N G A Z I M F O R L O C K
Chapter 1
- 0 . 5 4 9 (
- 8 . 3 )
4 4 . 8 1 1 (
4 4 . 8 )
36
B C N :
5 0
L O C A T E
S A T : G A L A X Y 2 8
< S T O P > H A L T
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