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Abstract and Applied Analysis
Volume 2014, Article ID 710850, 10 pages
http://dx.doi.org/10.1155/2014/710850
Research Article

Observer-Based Robust Control for Spacecraft Rendezvous with Thrust Saturation

1Research Center of Satellite Technology, Harbin Institute of Technology, Harbin 150001, China
2Department of Engineering, Faculty of Engineering and Science, University of Agder, 4898 Grimstad, Norway

Received 26 February 2014; Accepted 22 April 2014; Published 21 May 2014

Academic Editor: Hongli Dong

Copyright © 2014 Neng Wan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper proposes an observer-based robust guaranteed cost control method for thrust-limited rendezvous in near-circular orbits. Treating the noncircularity of the target orbit as a parametric uncertainty, a linearized motion model derived from the two-body problem is adopted as the controlled plant. Based on this model, a robust guaranteed cost observer-controller is synthesized with a less conservative saturation control law, and sufficient condition for the existence of this observer-based rendezvous controller is derived. Finally, an illustrative example with immeasurable velocity states is presented to demonstrate the advantages and effectiveness of the control scheme.