为了在单光子测距算法开发中更方便地评估和测试算法，需要一个能模拟真实目标回波信号和噪声信号的仿真平台。介绍了单光子测距系统的构成和基本原理，对目标回波信号和噪声信号模型进行分析。M序列是一种常用的数字伪随机序列，基于此，设计出一个比例可调的随机序列，并以此建立噪声模型。在FPGA芯片上设计出时序逻辑电路产生目标回波信号与噪声信号，且可以模拟运动速度、噪声强度等变化，在验证中得到了预期效果，可以用于后期复杂测距算法的开发。

In order to evaluate and test the performance of processing arithmetic in single photon laser ranging,an emulational platform that can simulate real target echo and background noise is of great value.The construction and basic working principle of single photon laser ranging technology are introduced,and analysis is made to the models of target echo and background noise.M sequence is a frequently used digital pseudo-random signal.Based on this,a random sequence with adjustable scale is created,which can act as model of noise.A sequential logic circuit that can generate echo and noise signals is designed on FPGA chip,which can simulate the changes of moving speed and noise intensity.An ideal result is obtained in experimental verification.