Generalized nonlinear time-domain tracking control model for advanced technology telescopes

Bobby Lee Ulich; Kent P. Pflibsen; Chris Sheppard; Lonnie K. Calmes

doi:10.1117/12.19250

1 July 1990 Generalized nonlinear time-domain tracking control model for advanced technology telescopes

Bobby Lee Ulich, Kent P. Pflibsen, Chris Sheppard, Lonnie K. Calmes

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19250
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

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.

Citation Download Citation

Bobby Lee Ulich, Kent P. Pflibsen, Chris Sheppard, and Lonnie K. Calmes "Generalized nonlinear time-domain tracking control model for advanced technology telescopes", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19250

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