中国光学（中英文）2024，Vol.17Issue(4)：959-970,12.DOI:10.37188/CO.2023-0203
快速反射镜的复合快速非奇异终端滑模控制
Composite fast nonsingular terminal sliding mode control of fast steering mirror
摘要
Abstract
This paper aims to improve the control performance of the precision tracking system for laser com-munication 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 over-come these challenges,we propose a composite fast nonsingular terminal sliding mode control strategy integ-rating feedforward decoupling compensation and fixed-time extended state observer.First,the FSM's coup-ling 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 coup-ling components and achieve motion decoupling between the X-axis and Y-axis.Second,the fixed-time ex-tended state observer is designed for each decoupled single-axis model to achieve a fixed-time estimation of angular velocity and external disturbances simultaneously.Then,the fast nonsingular terminal sliding mode surface is constructed,and the exponential power function is adopted to replace the sign function in control law design,so as to improve the system's convergence speed and suppress the chattering of the sliding mode.The proposed control system's stability and the tracking error finite-time convergence are proved based on the Lyapunov stability analysis method.Finally,the effectiveness of the proposed composite control strategy is verified by comparative experiments.The experimental results show that under the 100 Hz strong disturb-ances,for the FSM tracking 60 Hz and 120 Hz circular trajectories,the average absolute values of its traject-ory tracking error are 0.0036°and 0.0131°,respectively,indicating that the system can maintain good track-ing performance.The proposed composite control strategy is validated as effectively meeting the FSM's high-precision and strong anti-disturbance requirements for laser communication.关键词
激光通信/快速反射镜/前馈解耦/扩张状态观测器/终端滑模Key words
laser communication/fast steering mirror/feedforward decoupling/extended state observer/ter-minal sliding mode分类
信息技术与安全科学引用本文复制引用
李智斌,李亮,张建强..快速反射镜的复合快速非奇异终端滑模控制[J].中国光学（中英文）,2024,17(4):959-970,12.基金项目
国家自然科学基金项目(No.U23A20336,No.61733017) （No.U23A20336,No.61733017）
山东省自然科学基金项目(No.ZR2021QF117,No.ZR2021QF140)Supported by National Natural Science Foundation of China(No.U23A20336,No.61733017) （No.ZR2021QF117,No.ZR2021QF140）
Natural Sci-ence Foundation of Shandong Province(No.ZR2021QF117,No.ZR2021QF140) （No.ZR2021QF117,No.ZR2021QF140）
