粗跟踪机构的前馈复合控制策略

Composite Control Strategy for Coarse Tracking Mechanism Based on Feedforward Control

摘要:

为了解决传统双环比例-积分-微分（proportional integral derivative，PID）控制器稳态性能难以满足激光通信高精度光束对准需求的问题，以星载激光通信粗跟踪伺服控制系统作为研究对象，对其控制策略进行研究。首先分析了粗跟踪伺服控制系统的工作原理，建立了控制系统的传递函数模型；然后针对传统双环PID控制策略的不足，分析了粗跟踪机构的跟踪误差产生的原因，并提出了一种基于前馈控制器的粗跟踪伺服复合控制策略。仿真和实验结果表明，该复合控制策略能够有效改善系统性能、显著降低稳态误差，并能够很好地保证激光通信链路的稳定性和持续性。

Abstract:

To address the question that the steady-state performance of conventional double-loop proportional integral derivative (PID) controllers was insufficient for the high precision beam alignment of laser communication, the control strategies for the coarse tracking servo control system of satellite-borne laser communication was investigated as the research object. Firstly, the operational principle of the coarse tracking servo control system was analyzed, and the transfer function model of the control system was established. Furthermore, in response to the limitations of the conventional double-loop PID control strategy, the causes of the tracking error in the coarse tracking mechanism were analyzed. Consequently, a coarse tracking servo composite control strategy based on the feedforward controller was proposed. Both simulation and experimental results demonstrate that this composite control strategy can effectively enhance the control performance of the system, significantly reduce its steady-state error, and well ensure the stability and continuity of the laser communication link.