Robustness analysis of magnetic torquer controlled spacecraft attitude dynamics

Kim, J., Bates, D.G. and Postlethwaite, I. (2009) Robustness analysis of magnetic torquer controlled spacecraft attitude dynamics. Automatic Control in Aerospace, 2(1),

Abstract

This paper describes a systematic approach to the robustness analysis of linear periodically time-varying (LPTV) systems. The method uses the technique known as Lifting to transform the original time-varying uncertain system into linear fractional transformation (LFT) form. The stability and performance robustness of the system to structured parametric uncertainty can then be analysed non-conservatively using the structured singular value μ. The method is applied to analyse the stability robustness of an attitude control law for a spacecraft controlled by magnetic torquer bars, whose linearised dynamics can naturally be written in linear periodically time-varying form. The proposed method allows maximum allowable levels of uncertainty, as well as worst-case uncertainty combinations to be computed. The destabilising effect of these uncertain parameter combinations is verified in time-domain simulations.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Kim, Dr Jongrae
• Authors: Kim, J., Bates, D.G., and Postlethwaite, I.
• Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
• College/School: College of Science and Engineering > School of Engineering > Biomedical Engineering
• Journal Name: Automatic Control in Aerospace
• Publisher: Advanced Research Center on Electronic Systems, University of Bologna
• ISSN: 1974-5168
• Copyright Holders: Copyright © 2009 ARCES (University of Bologna)
• First Published: First published in Automatic Control in Aerospace 2(1)
• Publisher Policy: Reproduced with the permission of the publisher.