空间激光通信前提是信标光束的精确对准,因此复合轴的跟踪技术是关键,粗精复合的耦合性问题成为研究重点。设计了一套基于单探测器复合轴的跟踪系统,对其原理及关键技术进行阐述,采用粗跟踪配合补偿精跟踪偏转量的方法,解决了耦合性问题,并完成伺服控制系统设计。搭建实验系统对跟踪性能及指标进行验证,实验结果表明,在±0.25°@0.1Hz扰动下系统跟踪误差控制在1个像素之内,跟踪误差均方根为0.13,结合实际条件知,系统像元角分辨率22 μrad,故系统整体跟踪精度优于3 μrad,可实现对信标光的精确跟踪,满足空间激光通信的应用需求。
The premise of space laser communication is the precise alignment of the beacon beam. Therefore,the tracking technology of the composite axis is the key,and the coupling problem of coarse and fine composite becomes the research focus. A tracking system based on single detector composite axis is designed. The principle and key technology are expounded. The method of coarse tracking and compensation to compensate the deflection amount is used to solve the coupling problem and complete the servo control system design. The experimental system is built to verify the tracking performance and indicators. The experimental results show that the system tracking error is controlled within 1 pixel under ±0.25°@0.1Hz disturbance,and the tracking error RMS is 0.13. The element angle resolution is 22 μrad,so the overall tracking accuracy of the system is better than 3 μrad,which can accurately track the beacon light and meet the application requirements of space laser communication.