中文摘要：

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锛路通信的研究以及对端机性能的整体评估具有重要意义。

英文摘要：

The tracking precision of a terminal is required up to μrad level for the acquisition/tracking/pointing （ATP） system of the free-space laser communication. It＇ s important to validate this feature of the communication terminal. Hence a Tracking target simulator is designed to measure the terminal ＇ s tracking precision. The system simulates the incident light＇ s deflection first, then the terminal tracks the deflection and send back a beacon. The tracking precision is got by measuring the far-field facula position of the beacon. The experiment results show that the measuring system has a precision of 0.2μrad with 4μrad in amplitude and 250Hz in frequency. It is important for the research on the optical inter-satellite link （ISL） and the judgement of the free-space laser communication terminal.