Specifications

Doc Number: VIS-ANA-VER-01001-9002
Date: 27 May 2004
Issue: 5.0
Page: 67 of 80
Author: J. Delgadillo
Controls Preliminary Design Report Issue 5.doc
1. Position Track (Designate) Mode
Position Track accepts dynamic time tagged AZ/ALT/CASS position and velocity commands
at a 20 Hz rate with three commands ahead in time. Interpolation smoothes the data to
achieve excellent trajectory. Position Track can be used for both dynamic trajectories and
point-to-point moves. The MCU 100BaseT Ethernet interface is provided for the Host
Computer to command the Position Track mode.
2. Star Track Mode
The Star Track Mode continuously positions the mount on an internally calculated trajectory
of a celestial object. The MCU allows the entry, storage and modification of trajectory
elements for up to ten separate celestial targets. Other targets can be tracked by simply
entering the target’s Right Ascension and Declination parameters. Position and time offsets
may be entered from the MCU for “fine-tuning” the trajectory predictions.
MCU Open Position Loop Bode Plot