Investigation of Periodic-Disturbance Identification and Rejection in Spacecraft
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Authors
Lau, J.
Joshi, S.
Agrawal, B.N.
Kim, J.J.
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Advisors
Date of Issue
2006
Date
July-August 2006
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Language
Abstract
Spacecraft periodic-disturbance rejection using a realistic spacecraft hardware simulator and its associated models is investigated. The effectiveness of the dipole-type disturbance rejection filter on the current realistic nonlinear rigid-body spacecraft model is validated. However, it is shown that the rejection filter is not robust to disturbance frequency uncertainty. Therefore, system identification techniques are needed if the disturbance frequency is unknown or changing. Based on experience with the current test bed, two simple closed-loop system identification methods are introduced to experimentally identify the disturbance frequency using data from the control input torque signal. It is shown that an incorrect filter frequency results in beating of the control input torque. Examination of the beat envelope leads to tuning of the rejection filter.
Type
Description
The article of record as published may be found at http://dx.doi.org/10.2514/1.17341
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Department
Department of Mechanical and Aerospace Engineering
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Citation
AIAA Journal of Guidance, Control and Dynamics, Vol. 29, No.4, July-August 2006, pp. 792-798.
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This publication is a work of the U.S. Government as defined
in Title 17, United States Code, Section 101. As such, it is in the
public domain, and under the provisions of Title 17, United States
Code, Section 105, is not copyrighted in the U.S.