激光通信系统中快速反射镜控制技术研究

Research on Fast Steering Mirror Control Technology of Laser Communication System

摘要:

为满足激光通信系统跟踪精度的要求,采用快速反射镜系统作为精跟踪控制核心。选用大行程、高分辨率、高带宽的音圈电机驱动快速反射镜,对音圈电机控制方法进行了研究。首先,定性分析了快速反射镜系统的组成及工作原理。然后,根据音圈电机的等效电路模型进行建模分析,得到快速反射镜的传递函数模型。最后,介绍了模拟控制器的设计原理,给出了比例-积分-微分(Proportional-Integral-Derivative,PID)电路、位置检测电路以及功率放大电路的具体设计。实验结果表明,设计的快速反射镜的角分辨率为1μrad,重复定位精度为3μrad,闭环带宽(-3dB)为300Hz@1mrad,满足激光通信系统稳定可靠、精度高、抗干扰能力强等要求。

Abstract:

In order to meet the tracking accuracy requirements of the laser communication system, a fast steering mirror system is used as the core of fine tracking control, and a voice coil motor with large stroke, high resolution and high bandwidth is selected to drive the fast steering mirror, and the control method of voice coil motor is studied. Firstly, the composition and working principle of the fast steering mirror system is analyzed. Then, modeling analysis is performed according to the equivalent circuit model of the voice coil motor, and the transfer function model of the fast reflector is obtained. Finally, the design principle of the analog controller, the proportional-integral-derivative (PID) circuit, the position detection circuit and the power amplifier circuit are introduced. The experimental results show that the angular resolution of the fast steering mirror is 1μrad, the repeated positioning accuracy is 3μrad, and the closed-loop bandwidth (-3dB) is 300Hz@1mrad, which can meet the requirements of laser communication system for stability, reliability, high precision, and strong anti-interference ability.