卫星光通信精确跟踪控制系统的参数化综合优化设计

Parametric comprehensive optimization design of high accuracy tracking control system for satellite optical communication

中文关键词  控制系统参数化设计，多目标设计，卫星光通信，参数摄动，精准跟踪控制系统

英文关键词  parametric design of control system  multi-objective design  satellite optical communication  parameter perturbations  high accuracy tracking control system

中文摘要

      精确跟踪对准控制系统在卫星光通信中起着至关重要的作用. 我国已完成的墨子号量子科学实验卫星, 是 基于经典随动系统理论设计的跟踪与瞄准系统, 并在实践中取得了圆满效果. 面向未来更远距离的空间通信应用, 对跟踪与瞄准系统提出了更高的精度要求, 传统的控制方法很难满足. 为此本文提出了精确瞄准系统的一种参数 化设计方法, 抛弃了传统方法的精、粗系统分别设计的思想, 对两级子系统进行整体设计, 充分地利用了系统中的 设计自由度. 通过综合优化这些设计自由度, 实现了系统对阶跃干扰的解耦和复杂干扰的抑制、不敏感极点配置和 控制增益极小化等各项设计要求, 从而显著地提高了对准精度. 仿真结果表明, 对准精度由原来的微弧度量级提高 到了纳弧度量级.

英文摘要

      Accurate tracking and alignment control systems play a vital role in satellite optical communications. China’s completed Mozi quantum science experimental satellite uses a tracking and aiming system based on the classical follow-up system theory design, and achieved a satisfactory effect in practice. Space quantum communication application for farther distance in the future puts forward higher precision requirements for the aiming and tracking system, which is difficult to meet when using the traditional control method. To this end, this paper proposes a parametric design method for the aiming system, abandoning the idea of separate design of fine and coarse systems of the traditional methods, and designing the two-stage subsystems as a whole, making full use of the design freedom in the system. By comprehensively optimizing the design degrees of freedom, the system meets various design requirements such as decoupling step disturbance and attenuating complex interference, insensitive pole assignment and minimizing control gain, which significantly improves the alignment accuracy. The simulation results show that the alignment accuracy is improved from the original micro-arc metric to the nano-arc metric.