Overview
2.6 System Functions
The 7200 ACS offers a full complement of standard antenna position control modes
as well as a number of advanced tracking modes. For automatic tracking, the 7200
ACS incorporates a new approach to control system operation with a unique target-
oriented environment, which provides for the establishment of unique system
characteristics for multiple targets (satellites). In this manner, each target to be
accessed is user-configured with tracking mode, tracking signal frequency and slope,
etc. A target-specific data base is established for any predictive or programmed
tracking data relative to the target. Once configured, tracking for a target is initiated
and maintained in a fully automatic manner simply by invoking the "name" of the
target. This greatly enhances normal operation of the system by reducing the level
of required operator expertise and intervention.
Configuring a target includes the establishment of an operational mode to be used for
accessing that target. The following sections describe the available control modes
for the system in some detail. It should be noted that configuration of a new target
or editing of an existing target configuration is a relatively simple matter, with the
ACU user interface presenting information in logical order. As a result, the system
essentially allows for direct mode entry with the target configuration being
accomplished in real time. For more information on configuring targets, refer to
Section 5.8.2.6.
2.7 Standby
In Standby mode, the ACU does not command the antenna to move in any axis. The
AZ and EL inverters are powered-up but are not enabled, and brakes are set on
systems equipped with brakes. Real-time status, time, signal level, and position
information is being displayed on the ACU front panel along with any current fault
information. In Standby mode, the ACU is in an active wait state for instructions
from the front panel or computer interface.
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