主要解决空间激光通信精跟踪系统光斑实时检测与跟踪的问题。针对四像限探测器的特点,使用两级增益放大、数字信号处理(DSP)、振镜等系统,完成光斑实时检测与跟踪。对系统组成原理与设计原理进行了详细论证。搭建实验系统完成了相关实验。实验表明在入射光功率为1.3 μW时,四像限探测器可实现位置分辨率1.6 μm,角度分辨率0.8 μrad,在整个光敏面内具有80细分的能力,跟踪精度在1倍方差时为2.1 μrad。系统设计时以DSP作为数据处理与控制系统核心,具有体积小、参数修改方便和便于工程化等优点。

The problems of spot detection and tracking in fine tracking of space laser communication systems are researched. According to the characteristics of four-quadrant detector,the spot detection and tracking system is designed by using two band amplification,digital signal processing (DSP) system,fast-steening mirror etc. The principles of composition and design are studied in detail. A testing system is set up,which can prove by experiment that when the incident power is 1.3 μW,the position resolution of 1.6 μm,angle resolution of 0.8 μrad,and subdivision of 80 in photosensitive surface can be achieved. And the tracking precision is up to 2.1 μrad in one time variance at the conditions of high signal-noise ratio. With digital signal processing used as the core in data processing and control system,this system has many advantages such as small size,convenience to modify parameters,and engineering etc.