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Proceedings Paper

Generalized nonlinear time-domain tracking control model for advanced technology telescopes
Author(s): Bobby Lee Ulich; Kent P. Pflibsen; Chris Sheppard; Lonnie K. Calmes
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Paper Abstract

The tracking performance of advanced technology telescopes is presently predicted by a time-domain nonlinear control model which incorporates the complex frequency-dependent transfer characteristics of a type II servosystem, including (1) rate and acceleration feedforward, (2) gimbal-drive motors, (3) motor power amplifiers, (4) mechanical drivetrain, (5) telescope structure, and (6) encoders. Disturbances generated by bearing friction, drive motor magnetic cogging, drive motor friction and torque constant variations, wind loads, etc, are included to enhance the accuracy of tracking error predictions under operating conditions. The model is useful in both initial design studies and the evaluation of proposed design modifications.

Paper Details

Date Published: 1 July 1990
PDF: 9 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19250
Show Author Affiliations
Bobby Lee Ulich, Kaman Aerospace Corp. (United States)
Kent P. Pflibsen, Kaman Aerospace Corp. (United States)
Chris Sheppard, Kaman Aerospace Corp. (United States)
Lonnie K. Calmes, Kaman Aerospace Corp. (United States)


Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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