Fault diagnosis using robust cascade observers with application to spacecraft attitude control |
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Authors: | WANG Yu-lei MA Guang-fu LI Chuan-jiang |
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Affiliation: | Dept. of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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Abstract: | This paper proposes a new gyro and star sensor fault diagnosis architecture that designs two groups of cascade H∞ optimal fault observers using LMI for spacecraft attitude control systems.The basic idea of the approach is to identify the gyro fault to good effect first and then makes a further diagnosis for the star sensor based on the former.The H∞ optimal fault observer in design has the robustness with respect to model uncertainties and diagnosis uncertainties.Its robustness to unknown inputs is as a special study in frequency domain.Finally,simulation results demonstrate the effectiveness and feasibility of the proposed control algorithm. |
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Keywords: | spacecraft attitude control system fault diagnosis H∞ optimal fault observer cascade observer |
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