Settings
98-175666-C Chapter 4: Setup of the antenna 4-19
With heading input or fixed heading, Inclined Orbit Satellite
1. The antenna starts the acquisition, searches for 10 seconds at the expected
position. If RX lock is detected the antenna goes to Tracking.
2. If no RX lock is detected, a box search pattern is started and the positions where RF
power can be received are stored.
3. The antenna checks each stored position for up to 10 seconds. If RX lock is detected
for more than 20% of the time, the antenna goes to Tracking.
Without heading input and not fixed heading (Gyro-free)
1. A box search pattern is started and the positions with reception of RF power are
checked for up to 10 seconds. If RX lock is detected for more than 20% of the time,
the antenna goes to Tracking.
Acquisition times
Figure 4-13: Acquisition, search pattern for inclined orbit
Azimuth from inclination
Elevation from
inclination
Figure 4-14: Acquisition, search pattern in gyro-free mode
Activity/Inclination 0° 1° 2° 3° 4°
Initial search 10 s 10 s 10 s 10 s 10 s
Scan box pattern 5 s 10 s 15 s 25 s 30 s
Validate result (10 s per result) 10 - 30 s 10 - 30 s 10 - 30 s 10 - 30 s 10 - 30 s
Max. total time 25 - 45 s 30 - 50 s 35 - 55 s 45 - 65 s 50 - 70 s
Table 4-17: Acquisition time
+0.7°
0.0°
-0.7°
400° Long time
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