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Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 804754, 9 pages
http://dx.doi.org/10.1155/2013/804754
Research Article

Antidisturbance Fault Tolerant Control of Attitude Control Systems for Microsatellite with Unknown Input Delay

1School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China
2Science and Technology on Aircraft Control Laboratory, Beihang University, Beijing 100191, China

Received 23 August 2013; Accepted 24 September 2013

Academic Editor: Tao Li

Copyright © 2013 Jianzhong Qiao and Lei Guo. 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

The antidisturbance fault tolerant control problem of attitude control systems for microsatellite is investigated in the presence of unknown input delay, stuck faults from the reaction wheel and the multiple disturbances. The multiple disturbances are supposed to include the vibration disturbance torque from the reaction wheel and modeling uncertainties. The fault diagnosis observer and disturbance observer are constructed to estimate stuck faults and vibration disturbance torque from the reaction wheel, respectively. A composite fault tolerant controller is designed by combining a PID controller, the fault accommodation estimation based on the fault diagnosis observer, and the disturbance compensator based on the disturbance observer. The controller and observer gains can be easily obtained via a set of linear matrix inequalities. Simulation results are given to show that the faults can be accommodated readily, and the disturbances can be rejected and attenuated simultaneously.