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卫星激光通信捕获、跟踪、瞄准(ATP)需要端机具备有微弧度(μrad)量级的高精度跟踪能力。如何检验通信端机的这一特性是一个很重要的问题。设计了一套端机跟瞄精度测试装置。装置模拟入射光方向的偏转,端机跟踪从偏转方向发出的回馈信标光。通过测量回馈光远场光斑的位置变化可以得到端机的跟瞄精度。测试实验表明,当入射光方向的变化小于4μrad,测试频率在0~250Hz时,测试系统的精度可达到0.2μrad。此项工作对卫星激光通信的光链路通信的研究以及对端机性能的整体评估具有重要意义。
Satellite Laser Acquisition, Tracking, Aiming (ATP) requires end machines with high accuracy tracking capability on the order of microradians (μrad). How to test this feature of the communication terminal is a very important issue. Design a set of end machine with aiming accuracy test device. The device simulates the deflection of the incident light direction and the terminal tracks the feedback beacon light emitted from the deflection direction. By measuring the position of the feedback far-field spot light changes can be end-machine with aiming accuracy. The experimental results show that the accuracy of the test system can reach 0.2μrad when the change of incident light direction is less than 4μrad and the test frequency is 0 ~ 250Hz. This work is of great significance to the study of optical link communications in satellite laser communications and to the overall assessment of end-machine performance.