Operation
Although the screen in Figure 5-9 is titled Manual antenna control, only biasing can
be performed from this screen. Paragraph 5.8.2.5 explains how to manually
control the antenna from the ACU.
For a target with a tracking mode of Move to look angles, Move to longitude,
Intelsat-11 element, and Star tracking, the bias can be thought of as a "target-
specific offset". Targets with these tracking modes have a parameter, Bias angles,
which has a value in degrees for each axis. When the ACU is tracking a target,
the command position is computed using the appropriate technique for the tracking
mode, and then the bias angles are added to create the final command position to
which the ACU drives the antenna.
Use the following procedures to perform manual biasing:
1. From the Main menu, select Tracking functions...; then select Modify current
target..., and Manually bias target. The following prompt appears:
Enter manual antenna control to bias the current target? (yes/no)
[YES/NO] changes YES/NO response. [ENTER] accepts displayed YES/NO
response.
2. Answer YES. Peak the antenna using the appropriate arrow keys.
3. Press [PRIOR]. The following prompt appears:
Set bias for the current target from current look angles? (yes/no)
[YES/NO] changes YES/NO response. [ENTER] accepts displayed YES/NO
response.
4. If the user answers yes, the command position is subtracted from the current
position on each axis and stored as the target's bias. If the user responds no,
the ACU will move the antenna to the position computed for the target,
effectively "undoing" the manual antenna movement.
Because the Immediate tracking... modes are used for immediate tracking only
(i.e., the antenna is commanded to move to a position and is held there), none of
these modes have bias angles. For more information on Immediate tracking...,
refer to Section 5.8.2.4.
5.8.2.3.2 Tracking Receiver Parameters
The parameters for the Tracking receiver parameters... menu vary according to the
setting of Shell under the Remote port configuration... menu (refer to Section
5.8.6.12).
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