一种机载脉冲激光雷达回波模拟设备

摘要

传统的激光雷达测距机信号处理能力的评估需要激光器、光学系统和探测器等设备的配合，为简化该评估方法，研制了一种机载脉冲激光雷达回波模拟设备。通过分析脉冲激光雷达回波特性，建立了回波数学模型，指出了衡量测距性能的关键参数。以模型为理论依据，以距离、信噪比等参数为输入，采用软件算法生成波形数据并存储于PC机，通过硬件电路将波形数据处理输出，形成模拟激光回波。实验证明，该设备可模拟目标最远40 km，信噪比最小为2的回波，其中，目标距离模拟误差在0．95‰内，信噪比平均模拟误差为13．3％，该设备工作稳定可靠，满足使用要求，极大地简化了激光雷达测距机信号处理能力的性能测试。%Traditional methods for evaluating the signal processing ability of ladar rangefinder needs using such equipments as laser,optical system and detector.To simplify it,an echo simulation equipment for airborne pulse-ladar was developed.Based on analysis to characteristics of the pulse-ladar's echo signals,the mathematical model of echo was established,and critical parameters affecting ranging performance were given.Based on the model,and using the critical parameters of distance and SNR as inputs,echo waveform data were generated by software algorithm,stored in PC and output by hardware circuit .Finally,the simulated echo signal was formed.Experiments shows that,the equipment can simulate the echo signal of target at the maximum distance of 40 km and with the minimum SNR of 2,in which the distance error is less than 0.95‰and average error of simulating SNR is 13.3%.The equipment is stable and reliable,which can meet the requirements,and simplifies the performance test of ladar rangefinder .