Dynamic output feedback sliding mode control for spacecraft hovering without velocity measurements |
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| Authors: | Kai Zhang Guang-Ren Duan Ming-Da Ma |
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| Institution: | 1. Center for Control Theory and Guidance Technology, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China;2. School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610097, Sichuan, China |
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| Abstract: | In consideration of target angular velocity uncertainty and external disturbance, a modified dynamic output feedback sliding mode control (DOFSMC) method is proposed for spacecraft autonomous hovering system without velocity measurements. As a stepping-stone, an additional dynamic compensator is introduced into the design of sliding surface, then an augmented system is reconstructed with the system uncertainty and external disturbance. Based on the linear matrix inequality (LMI), a sufficient condition is given, which guarantees the disturbance attenuation performance of sliding mode dynamics. By introducing an auxiliary variable, a modified version of adaptive sliding mode control (ASMC) law is designed, and the finite-time stability of sliding variable is established by the Lyapunov stability theory. Compared with other results, the proposed method is less conservative and can decrease the generated control input force significantly. Finally, two simulation examples are performed to validate the effectiveness of the proposed method. |
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| Keywords: | Corresponding author |
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