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7.5
The Acquisition process
This section describes the normal operations of the AAQ controller from power on to acquisition of the
target. For each step, the “command response” indicated on the GUI will also be included.
7.5.1 Power on and Boot
The AAQ controller is a Linux based operating system. When power is applied to the controller, the
system begins a boot process that loads the file system and application programs into RAM. This boot
process requires 30-60 seconds to complete. Once the controller is booted, it is in an operational state
and ready to accept commands. For this example we will use a system equipped with a modem for our
signal source.
All external equipment modules are initialized during the boot process. During this process the modules
are allowed to initialize specific devices or functions outside the normal AAQ operations.
When booted the controller awaits a command request. Commands recognized by the AAQ controller
are:
Stop:
Stops the current running command.
Manual Control:
Enables the manual jog commands to be accepted.
Home:
Positions antenna upright, initializes axis based sensors, and reads compass.
Stow:
Stows the antenna to the specified values based on the configuration.
X Pol:
Moves the polarization 90 degrees from its current position.
Acquire:
Automatically points the antenna to the specified satellite.
Move To:
Moves to the requested pedestal coordinates.
Peak:
Performs peaking using the current signal source.
Track:
Performs the current tracking sequence.
Repeak:
Performs fine peaking sequence if signal is above a set threshold.
7.5.2 Home Sequence
The “Home” command determines tilt and initializes the motor feedback sensors (i.e. encoders and
resolvers) needed for precision movements. The acquire command will initiate a “home” sequence
before completing the sequence.
7.5.2.1
Setting the Azimuth Axis
Once the elevation axis has reached its home position, the azimuth axis will begin searching for the
magnetic reed switch located in the center of the azimuth axis on the baseplate. The azimuth will
