摆镜式激光通信终端光束指向与粗跟踪特性

Beam pointing and coarse tracking characteristics of Tip-Tilt mirror type laser communication terminal

基于两正交旋转轴的单平面镜(摆镜式)激光通信终端的粗跟踪问题,提出了一种求解光束指向的法矢量求解算法,给出了该类型通信终端的粗跟踪算法。采用矢量反射定律和矩阵旋转变换规律,理论推导了摆镜的光束指向模型和跟踪模型,对比分析了不同安装方式对光束指向和畸变的影响,并对模型分别进行了建模仿真和实验研究。结果表明:光束传输模型和粗跟踪模型的精度优于3μrad,所研制的摆镜式激光终端粗跟踪精度,最大误差优于15.5μrad (3σ),均方根误差优于10.5μrad,满足激光通信终端对高精度粗跟踪的技术要求。该研究工作对摆镜式扫描系统的光束指向分析和激光终端粗跟踪具有借鉴意义。

To realize the coarse tracking of laser communication terminal(LCT) with a single plane mirror(TipTilt mirror type)and two orthogonal rotation axes, a normal vector solving algorithm for beam pointing was proposed. The coarse tracking algorithm of this type LCT was given. By using vector reflection law and matrix rotation transformation, a theoretical derivation of the tip-tilt mirror was carried out to get the analytical solution of the beam pointing model and tracking model. The effects of different installation methods on the beam pointing and distortion were discussed. The model was researched on modeling simulation and experiment respectively.The results show that the accuracy of the beam pointing model and the coarse tracking model are better than 3 μrad.The developed LCT has a coarse tracking accuracy better than 15.5 μrad(3σ), and the RMS error is better than10.5 μrad. It meets the high-precision coarse tracking requirements of the LCT. The work has reference significance for beam pointing analysis of the Tip-Tilt mirror type scanning system and laser terminal coarse tracking.