Collaboration Case:  Move Probe to Guide Star

Description:  This collaboration case is responsible for moving the probes (CCD window and FSS Translation Stage) to the location of the selected guide star.

Performance:  some milli-seconds

Frequency:  Any time

Package Assignment:  Auto Guiding.

Preconditions: 

• ATCS is ONLINE
• GS coordinates are available

Basic Course: 

• Send command PRGS with (alpha, delta) coordinates for the probe.
• ATCS Sets the Guide Reference Point
  Exception Course: Command failed
  Postcondition1: FAS Reference point is set
  Postcondition2: FSS Translation Stage in position and tracking
• ATCS Prepares the FAS setup:
  • Infinite Loop
  • Full frame
  • Display
  • No computation
  • UIT set according to the magnitude of the GS (TBD)
  Exception Course: Command failed
• ATCS Starts Field Acquisition
  Exception Course: Command failed

Exception Course: Command failed

• ATCS returns ERROR reply.

Postconditions: 

• Probes are located on the GS.
• FAS CCD displays field

Issues to be Determined or Resolved: 

Notes:

Last modified: Thu Dec 20 15:24:36 UTC 2001