卫星激光通信粗跟踪系统复合控制策略

针对卫星激光通信粗跟踪系统的跟踪稳定精度指标要求高的特点,建立了基于永磁同步电机直接驱动的粗跟踪系统模型并进行了跟踪稳定误差分析。在采用传统PID控制策略存在跟踪误差较大、动态性能较差等不足的基础上,提出了一种基于粗跟踪系统的改进型前馈复合控制策略。从理论上分析了前馈复合控制策略提高了粗跟踪系统的动态性能,为降低跟踪稳定误差提供了改善方案。地面实验验证结果表明,与传统控制策略相比,改进型复合控制策略极大地降低了系统的动态跟踪误差,动态跟踪误差由606μrad降低至13μrad(1δ)。进一步的在轨实验也验证了改进型复合控制策略的合理性和先进性,总体指标满足了卫星激光通信终端的极高精度要求。本文所提出的控制策略对其他高性能跟踪伺服系统设计也具有较大的借鉴意义。

Compound control strategy of satellite laser communication coarse tracking system

To meet high tracking stability accuracy requirements,a model of a satellite laser communication coarse tracking system based on a Permanent-Magnet Synchronous Motor(PMSM)was established,and the tracking stability error was analyzed.Owing to a larger tracking error and poor dynamic response performance from the traditional Proportional-Integral-Derivative(PID)control strategy,an improved feed-forward compound control strategy based on the coarse tracking system was proposed.The coarse tracking system was analyzed theoretically to improve dynamic performance.The ground experimental results show that,compared to the traditional control strategy,the improved compound control strategy greatly reduces the dynamic tracking error of the system,from 606 to 13μrad(measured to one standard deviation,1δ).The rationality and advancement of the improved compound control strategy are also verified by further on-orbit experiments.Overall performance indicators satisfy the extremely high precision requirements of the satellite laser communication terminal.The proposed control strategy is capable of being used in future designs for other high-performance tracking systems.