新型Smith预估控制在ATP伺服系统中的应用

Application of a new Smith predictive control in the ATP servo system

为了提高空间光通信的捕获、跟踪与瞄准系统的跟踪精度,首先通过对ATP伺服系统系统进行结构分析:针对粗跟踪系统的传输特性和电机滞后,采用SISO补偿器使系统的响应速度明显加快;针对精跟踪系统的传输特性和快速倾斜镜的迟滞特性,提出了一种新型Smith预估控制方法,利用MATLAB仿真软件进行仿真,并与多种传统的PID控制系统进行比较。结果表明,新型控制方法不但具有Smith预估器对时滞有效控制的优点,更是显现出PID控制、PI控制、PD控制的良好匹配效果,能够很好地解决纯时滞造成的不稳定性,而且具有较好的鲁棒性和抗干扰性。

In order to improve the tracking accuracy of ATP （acquisition, tracking, pointing） control system for space optical communication, the ATP servo control system is analyzed at first. Considering the transmission characteristic and motor time-delay, the SISO compensator is used to make the system response more quickly. A new Smith predictive control is presented considering the transmission characteristic of fine tracking system and the fast steering mirror time-delay. It is simulated with MATLAB, and the obtained results are compared with that of the conventional PID controllers. The simulation results show that the new control method has obvious advantages for time delay control, and has good match feature with PID, PI and PD control. The system is a good solution to the instability caused by the pure time delay. It has better robustness and anti-interference features.