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精跟踪伺服系统设计是APT的核心技术,决定了通信链路能否建立以及通信系统的性能。针对空间光通信中压电陶瓷驱动FSM偏转具有非线性、时变不确定性和纯滞后等特性,提出变论域自适应模糊PID控制方法。引入变论域思想,并通过对输入变量加入伸缩因子的方式来实现变论域的目的,自适应能力和抗干扰能力明显增强,可有效解决稳定性与准确性的矛盾。实验结果表明:模糊PID控制算法增强了伺服系统鲁棒性,并提高了伺服系统实时性;跟踪精度可达到5μrad,对卫星平台振动和大气湍流引起信标光斑抖动有一定的抑制作用,能够满足空间光通信精跟踪精度的要求。
Precise tracking servo system design is the core technology of APT, which determines whether the communication link can be established and the performance of the communication system. Aiming at the characteristics of FSM deflection of piezoceramic driven FSM in space optical communication, such as non-linearity, time-varying uncertainty and time delay, a new adaptive fuzzy PID control method based on variable universe is proposed. By introducing the idea of variable universe, and by adding scaling factor to the input variables, the purpose of variable universe is realized. The adaptability and anti-jamming ability are obviously enhanced, which can effectively solve the contradiction between stability and accuracy. The experimental results show that the fuzzy PID control algorithm enhances the robustness of the servo system and improves the real-time performance of the servo system. The tracking accuracy can reach 5μrad, which can restrain the vibration of the satellite platform and the beating of the beacon spot caused by atmospheric turbulence, Space optical communications precision tracking requirements.