天基单光子三维成像激光雷达系统中激光器高重频优化研究

Laser Optimum High Repetition Rate Research for Spaceborne Single Photon 3D Imaging Laser Radar System

摘要: 天基激光三维成像系统充分利用了激光能量密度高、方向性好的优势，在主动探测过程中可以获得比微波雷达更高的成像精度，在军事、民用等方面具有极高的应用价值。由于星载激光器功率受限，星地链路距离长，因此其探测体制为单光子探测。对于单光子探测来说，为了达到较高的探测概率，需采用多脉冲探测体制。高重频窄脉冲的激光器技术是天基激光三维成像系统的关键技术之一。受我国现有激光器技术限制，星载固体激光器的重频达到KHz以上难度极大。本文针对天基激光三维成像系统，对激光重频和卫星飞行速度、轨道高度间的关系进行了建模，并给出了激光重频和单光子系统探测概率间的关系，得到最佳激光重频与系统探测概率、卫星轨道高度、飞行速度等参数间的制约关系。本文研究结果对于激光三维成像雷达系统的优化设计给出了理论依据。

Abstract: Spaceborne 3D imaging laser radar system takes full advantage of laser such as high energy density and good directivity, resulting in attractive feature of high imaging resolution, which has outstand-ing value in military and commercial applications. Subject to the limited power of spaceborne laser, it is necessary to adopt single photon detection due to the extremely long link distance. For single photon detection system, multi pulse detection can improve the detection probability. High reple-tion rate laser is one of the key technologies, and the current highest repletion rate of solid state la-ser is about several kHz. In this paper, the model of optimum laser repletion rate is built with con-sideration of satellite orbit velocity, orbit height, and system surface resolution. What is achieved in this dissertation contributes to the spaceborne 3D imaging laser radar system optimal design.