基于盖革模式APD的啁啾调幅激光雷达分析  

Analysis of chirped AM ladar based on Geiger-mode APD

作　　者：方照勋[1] 张华[1] 刘鹏鹏[1] 李海廷[1] 路英宾[1] 高剑波[1] 陈德章[1] 卿光弼[1] 

机构地区：[1]西南技术物理研究所,四川成都610041

出　　处：《激光与红外》2012年第6期620-625,共6页Laser & Infrared

摘　　要：针对基于Gm-APD的光子计数啁啾调幅雷达,介绍了FM-CW测距原理和光子计数啁啾调幅原理。以分析单个Gm-APD像元产生的初级光电子和暗计数噪声为基础,对回波光信号的探测还原进行了研究和仿真,并对影响系统性能的关键参数进行了仿真评估。仿真结果表明,对于本文设计的系统,探测2 km远目标的最小发射功率为6.4 W;中频信号的幅度随Gm-APD整形脉冲的脉宽增加而增加,中频信号的信噪比则随Gm-APD整形脉冲的脉宽增加而减小。另外,系统还具有良好的调制失真抑制能力和多目标分辨能力。The operating principle and simulation results for the photon counting chirped amplitude modulation（AM） ladar using Geiger Mode avalanche photodiode （ Gm-APD ） detector are introduced. The key parameters of the system and the recovery of the modulating signal are studied and simulated. The simulation result shows that, for our system to detect a 2 km target,the minimal emitting optical power is 6.4 W. It also shows that the wider the pulse width output- ted by the Gm-APD is, the smaller the IF signal is, which is opposite to the SNR. On the other hand, the photon-count- ing chirp AM ladar has a good ability to control the modulating distortion and distinguish multi-target.

关 键 词：三维成像 激光雷达 盖革模式 光子计数 调频连续波 中频信号 

分 类 号：TN958.98[电子电信—信号与信息处理]