Robustness analysis of magnetic torque controlled spacecraft altitude dynamics

Kim, Jongrae, Bates, Declan and Postlethwaite, Ian (2009) Robustness analysis of magnetic torque controlled spacecraft altitude dynamics. Automatic Control in Aerospace, 2 (1). ISSN 1974-5168

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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:	Article
Subjects:	H600 Electronic and Electrical Engineering
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	Sarah Howells
Date Deposited:	15 Oct 2012 16:00
Last Modified:	12 Oct 2019 22:25
URI:	http://nrl.northumbria.ac.uk/id/eprint/9670

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