An Extremely Slow Motion Servo Control Technique Used in the Hubble Space Telescope's Star Selector Servo Subsystem

Details An Extremely Slow Motion Servo Control Technique Used in the Hubble Space Telescope's Star Selector Servo Subsystem An Extremely Slow Motion Servo Control Technique Used in the Hubble Space Telescope's Star Selector Servo Subsystem

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997taea....1..483m&link_type=abstract

NASA University Research Centers Technical Advances in Education, Aeronautics, Space, Autonomy, Earth and Environment, vol. 1, p

Physics

Servomechanisms, Torque Motors, Servocontrol, Hubble Space Telescope, Feedback Control, Coders, Digital Systems, Star Trackers

Scientific paper

A state-of-the-art, slow motion dual axis servo control system used on the Hubble Space Telescope's Star Selector Subsystem is presented. It utilizes optical encoders with integral DC torque motors to provide precise, digital rate control over a range of 0.5 arcseconds/second (0.0333 revolution/day) to 16,384 arcseconds/second (0.759 revolution/minute) and 21-bit absolute-position words to an accuracy of 2.0 arcseconds peak-to-peak. In the finetracking mode the system provides position tracking to the order of 0.1 microradian.

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