新型二自由度Smith预估控制在ATP伺服系统中的应用

Application of novel two degree-of-freedom Smith predictive control in ATP servo systems

为了提高空间光通信的捕获、跟踪与瞄准系统的跟踪精度,提出了一种新型二自由度Smith预估控制的实现方法。首先对捕获、跟踪与瞄准伺服系统和新型二自由度Smith预估控制系统进行结构分析,然后通过讨论传递函数建立仿真模型,利用MATLAB仿真软件进行仿真,并与多种传统的比例-积分-微分(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,更显现出不完全微分先行PID控制和比例-积分控制的良好的匹配效果,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 acquisition, tracking, pointing（ATP） control system for space optical communication, a novel two degree-of-freedom Smith predictive control was presented. Firstly, the ATP servo control system and novel two degree-of-freedom Smith predictive control system were analyzed. Then the simulation model was established by discussing the transfer function. Simulation was carried out with MATLAB software. Finally, the obtained result was compared with that of some conventional proportion-integral-derivative （PID）controllers, and the anti- interference and robustness of the method were measured. The simulation results show that the novel control method not only has the advantage of Smith predictor delay effective control, but also show the good match effect of incomplete derivative forward PID control and proportion-integral （PI） control. This method is a good solution to the instability caused by pure time delay, it also has better robustness and immunity.