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 SMI. On the other hand,the photon-counting chirp AM ladar has a good ability to control the modulating distortion and distinguish multi-target.%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6.4W；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.
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