空间光通信APT探测技术中位置敏感器件（PSD）的研究

鉴于空间光通信系统中分辨率在很大程度上影响着整个通信系统的性能，而PSD(position sensitive detector)作为APT(acquisition, pointing and tracking)子系统常用的探测器件，具有分辨率高，无盲区，响应速度较快的优点，分析了PSD的基本结构和定位原理，研究了使用PSD作为空间光通信APT子系统粗跟踪技术的位置分辨率，并指出了提高PSD分辨率的着手点。用实验方案对PSD的分辨率进行了具体的实验分析。通过对实验数据分析可知，PSD的平均位置分辨率达到12.6μm，该值与理论分辨率吻合得较好。这说明PSD作为APT子系统精跟踪探测器的可行性。

Position sensitive devices in APT detection technology used in optical communication

In free-space optical communication system,the resolution is a very important parameter,which affects the performance of the whole system. As a common detector in the sub-system of APT,PSD has some advantages,such as high resolution,no blind area,high-speed response,etc. The basic architecture of PSD and its detection theory are analyzed,the position resolution in spatial optical communication achieved with PSD is investigated,and the methods are presented to improve the position resolution of PSD. A set of experiment system was set up to analyze the resolution of PSD in sub-system of APT. Through the analysis of the data which we achieve,the average position resolution is up to 12.6 μm which agrees with theoretical resolution quite well. The feasibility of PSD as a fine tracking detector in the sub-system of APT is proved.