激光通信终端光学收发通道运动学支撑设计

Kinematic Support Design of Optical Transmitter and Receiver Channel of Laser Communication Terminal

光学收发通道是激光通信终端的核心模块,其发射和接收光轴同轴度是制约激光通信终端建链通信的关键指标,且易受外界影响。应用"运动学约束"原理提出了双脚架支撑系统作为光学收发通道"2-2-2"约束的具体实现形式。推导出了双脚架结构释放的四个自由度方向的柔度公式,进而确定了双脚架的关键结构参数。应用有限元方法对某激光通信终端光学收发通道在有安装误差和温度变化工况下发射和接收光轴同轴度变化进行了仿真分析。结果表明:温度变化4℃和安装误差为0.05 mm的工况下,发射和接收光轴同轴度的变化量均能够满足优于15″的指标要求。作为对比,法兰式收发通道温度变化4℃时的收发光轴同轴度变化为26.81″。为激光通信终端光学收发通道的设计提供了参考。

As the core module of laser communication terminal,the coaxiality of multiple optical axes of optical transmitter and receiver channel were the key indexes to the linkage of laser communication terminals,which were affected by environment easily.In this paper,the"2-2-2"type bipod support system was presented as the supports of optical transmitter and receiver channel based on the principle of kinematic constraint.The flexibility formulas of four degrees of freedom released by the bipod structure was derived;and then the key structural parameters were determined.Changes of the coaxiality of optical transmitter and receiver channel under the condition of mounting error and temperature variation were simulated by the finite element method.The results show that the change of the coaxiality of optical axes is less than 15″with temperature variation of 4℃or 0.05 mm mounting error.By contrast,the coaxiality of optical axes of flanged transmitter and receiver channel changed by 26.81″with temperature variation of 4℃.It provides a reference for the design of optical transmitter and receiver channel of laser communication terminal.