线性调频连续波激光雷达测量方法研究  

Measurement of Linear Frequency-Modulated Continnous-Wave Laser Radar

作　　者：曾朝阳[1] 张晓永 贾鑫[1] 

机构地区：[1]装备指挥技术学院光电装备系,北京101416 [2]武汉军事代表局驻焦作地区代表室,河南焦作454001

出　　处：《激光与光电子学进展》2011年第2期80-86,共7页Laser & Optoelectronics Progress

基　　金：国防预研重点基金(9140A05070508BQ0103)资助课题

摘　　要：线性调频连续波激光雷达在光电器件响应速度有限的条件下,要满足较高的距离分辨率的测量要求,就需要比同体制微波雷达大得多的相对带宽。这就导致线性调频连续波微波雷达的距离与速度去耦合方法不能被直接应用。针对探测近距高速运动目标和实时性高的要求,根据激光雷达目标回波的特点,提出了一种快速线性调频信号参数估计方法,利用均匀分成两段的中频信号的傅里叶变换来获取目标的距离与速度信息。在目标距离50m,速度1000m/s,中频信噪比为0的仿真条件下,雷达测距误差小于15mm,测速误差小于10m/s。仿真实验表明,该方法具有较高的测量精度和较强的抗干扰能力。Since the corresponding rate of the photoelectric devices is limited and the laser radar needs to meet the requirements of higher distance resolution,linear frequency-modulated continuous-wave （LFMCW） laser radar′s relative bandwidth has to be larger than that of the microwave radar.The measuring theory of LFMCW microwave radar′s distance and velocity of moving targets cannot be applied directly to the laser radar.In order to detect the short-range high-speed moving target in real-time,a fast linear frequency modulated signal parameters estimation algorithm is proposed,according to the echo′s characteristics of laser radar target.This algorithm divides the IF signal into two sections symmetrically,then carries out Fourier transform of the IF signal to get the target′s distance and speed information.If the target distance is 50 m,speed is 1000 m/s,and IF signal to noise ratio （SNR） is 0,the radar′s ranging error is less than 15 mm and velocity error is less than 10 m/s.Results of simulation experiment show that the algorithm has high measuring precision and strong anti-jamming capability.

关 键 词：测量 激光雷达 参数估计 距离速度去耦合 线性调频连续波 

分 类 号：TN911[电子电信—通信与信息系统]