| Citation: | LI Zhi-bin, LI Liang, ZHANG Jian-qiang. Composite fast nonsingular terminal sliding mode control of fast steering mirror[J]. Chinese Optics, 2024, 17(4): 959-970. doi: 10.37188/CO.2023-0203
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This paper aims to improve the control performance of the precision tracking system for laser communication by studying the control method of Fast Steering Mirrors (FSM) driven by a voice coil motor. FSM often face the problems of strong cross-coupling characteristics and external disturbances. To overcome these challenges, we propose a composite fast nonsingular terminal sliding mode control strategy integrating feedforward decoupling compensation and fixed-time extended state observer. First, the FSM’s coupling transfer function matrix model with double inputs and double outputs is established by using the system identification method, and the feedforward decoupling compensator is designed to compensate for the coupling components and achieve motion decoupling between the
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