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Controller design and parameter identifiability studies for a large space antennaThe problem of control systems synthesis and parameter identifiability are considered for a large, space-based antenna. Two methods are considered for control system synthesis, the first of which uses torque actuators and collocated attitude and rate sensors, and the second method is based on the linear-quadratic-Gaussian (LQG) control theory. The predicted performance obtained by computing variances of pointing, surface and feed misalignment errors in the presence of sensor noise indicates that the LQG-based controller yields superior results. Since controller design requires the knowledge of the system parameters, the identifiability of the structural parameters is investigated by obtaining Cramer-Rao lower bounds. The modal frequencies are found to have the best identifiability, followed by damping ratios, and mode-slopes.
Document ID
19860034544
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Joshi, S. M.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Canadian Society for Mechanical Engineering, Transactions
Volume: 9
Issue: 3, 19
ISSN: 0315-8977
Subject Category
Spacecraft Design, Testing And Performance
Accession Number
86A19282
Distribution Limits
Public
Copyright
Other

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