49
OPERATING THE ACU
-3°
-2°
-1°
0°
1°
2°
3°
1 5 10 15 20 3025
Search 1 (Gyro Free) Search Pattern
Search 3 pattern
Elevation
(EL) Range
0.5˚
Azimuth (AZ) Range
Search 3: a search pattern 3 will automatically be initiated when AGC / SIG falls
below the current tracking level threshold value. If the desired signal is found and
above the predefined tracking level, the ACU will terminate Search 3 and go into
TRACKING mode. A search pattern will automatically be initiated when AGC / SIG
falls below the current threshold setting (indicates that satellite signal has been
lost). Search is conducted in a two-axis pattern consisting of alternate movements
in azimuth (AZ) and elevation (EL) as forming expanding square indicated as below
diagram.
Target Satellite EL Position
Revolution (AZ direction)
Target EL Angle
Turn 1
Target EL Angle + 0.5°
Turn 2
Target EL Angle - 0.5°
Turn 3
Search 1 antenna motion
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