星间光通信终端粗瞄系统鲁棒非脆弱H∞控制

 光通信终端粗瞄控制系统设计对通信链路的建立有重要影响。本文对潜望式粗瞄伺服机构在外层空间受到的力矩扰动进行了分析，由于其变化规律复杂，将其作为低频有界扰动附加于无刷直流 (BLDC)电机上,推导了有界无结构摄动情况下的终端控制对象模型；引入非脆弱状态反馈设计，确保在控制器参数漂移时闭环系统仍具有二次稳定性；利用线性矩阵不等式(LMI)方法，获得了二次稳定条件下的干扰抑制和防止执行器饱和的非脆弱控制器条件；最后对光通信终端的无刷直流电机模型进行分析，利用MATLAB完成粗瞄控制器的解算。仿真表明闭环系统在摄动下具有二次稳定性，对干扰有抑制力，其反馈控制量能满足预防饱和的设计要求。

Robust Non-fragile H∞, Control for Coarse Pointing System of Inter-satellite Optical Communication Terminals

The design of a coarse pointing control system for optical communication terminals is a key factor that affects the process of setting up a communication channel. In this article, the disturbance moments arising from friction and eccentricity are analyzed for a periscope coarse pointing servo system. They are converted into a bounded unmodeled perturbation added to the brushless direct current (BLDC) motor. A terminal model using the state space method is deduced when model uncertainty and moment perturbation exist simultaneously. The linear matrix inequality (LMI) criterion is proposed when quadratic stability, disturbance attenuation and actuator input saturation problems are discussed through non-fragile state feedback. Finally, the BLDC model of communication terminals is investigated. According to the LMI criterion, the coarse controller is calculated by MATLAB toolbox. The simulation proves that the controller resists moment disturbance and saturation effectively, and possesses quadratic stability when bounded uncertainty of plant emerges.