激光通信精瞄快速偏转镜的偏转控制模型及策略

Control Strategy and Model of Fast Steering Mirror in Space Laser Communication

为了找出一种满足空间激光通信要求的快速偏转镜（FSM）驱动方式，在分析比较目前主要的驱动方式：音圈电机、压电晶体和电磁直接驱动的基础上，选取了电磁直接驱动方式作为FSM系统的控制方法。电磁直接驱动具有调整速度快、重量轻、体积小、耗能少但系统设计与控制复杂的特点。通过建立快速偏转镜机械系统、电磁作用系统传递函数模型，并由外部物理作用模型将机械一电磁系统耦合起来。根据FSM的基本要求和模型控制特点提出了基于电流前馈的角度位置闭环控制策略，仿真对FSM驱动性能进行了全面分析，通过仿真结果验证了建立的模型正确性及控制策略的有效性。

In order to find a fast steering mirror（FSM） diving method that meets the demands of space laser communication, the direct electromagnetic actuator is selected to control a FSM system after comparing different actuating methods among the voice coil actuator, piezoelectric actuator and direct electromagnetic actuator. The direct electromagnetic actuator has the advantages of good real time, low weight, small size and small power, but on the other side, it has the disadvantages of the complicated system design and control. By establishing the transfer functions of FSM system and electromagnetic effect system, the mechanical-electromagnetic system is coupled by an external output physical model. According to the basic requirements and model controlling char- acters of FSM, a control strategy of current feedforward is given out. The characters of the FSM system are re- searched by simulation and experiment. The results prove the correctness of the model established and the ef- fectiveness of the control strategy.