大视场阵列探测器归心算法研究

Research on centering algorithm of array detector with large field of view

为了实现空间光通信系统小型化、一体化设计,建立了基于阵列探测器和快速偏转镜的一体化跟踪系统,通过分析阵列探测器的光斑位置检测原理提出了一种归心算法。首先通过设置阈值,设计了光斑不完全覆盖探测器的粗归心策略;然后采用数据库查询的方法完成精归心,最后采用无穷积分法使光斑归至原点附近;通过搭建试验平台验证了算法的正确性和可行性。实验结果表明:跟踪视场可达70.3 mrad,较原算法视场扩大了约3倍,跟踪最大误差优于1.8μrad,为空间光通信系统的进一步工程化应用奠定了基础。

In order to realize the miniaturization and integration design of space optical communication system,an integrated tracking system based on the array detector and the fast deflection mirror is established.By analyzing the principle of spot position detection of array detector,a centering algorithm is proposed.Firstly,the coarse centering strategy is designed by setting the threshold value.Then,the fine centering is completed by using the database query method.Thirdly,the infinite integral method is used to make the spot return to the origin.Finally,the correct-ness and feasibility of the algorithm are verified by building an experimental platform.The experimental results show that the tracking field of view can reach 70.3 mrad,which is about 3 times larger than that of the original algorithm,and the maximum tracking error is better than 1.8μrad,which lays a foundation for further engineering application of the space optical communication system.