-3°
-2°
-1°
0°
1°
2°
3°
1 5 10 15 20 3025
Search 1 (Gyro Free) Search Pattern
Search 3 pattern
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 predened 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)
Search 1 antenna motion