面向FMCW激光雷达系统测距测速的光源相位噪声补偿方法  

Phase-noise-compensation method of optical source for velocity measurement by FMCW lidar

作　　者：代志伟 樊昕昱 何祖源 DAI Zhiwei;FAN Xinyu;HE Zuyuan(School of Electronic Information and Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《光通信技术》2021年第7期5-9,共5页Optical Communication Technology

基　　金：国家重点研发计划(2017YFB0405500)资助;国家自然科学基金(61775132、61735015、61620106015)资助。

摘　　要：由于目标运动时对后期处理式的相位噪声补偿方法有影响,回波拍频信号相位噪声与辅助干涉仪获取的相位噪声不匹配,导致引入额外残余相位噪声。针对该问题,分析了调频连续波(FMCW)激光雷达系统中目标物体运动对于传统光源相位噪声补偿法的影响,提出了一种预估目标距离及速度进行光源相位噪声补偿的新方法。系统光源部分采用分布反馈(DFB)激光器,使用电流直接调制进行线性扫频。对运动物体进行实测的结果表明:采用新型光源相位噪声补偿方法,测量精准度提升了41倍,且能同时精确测量距离与速度。Due to the influence of target motion on the post-processing phase noise compensation method,the phase noise of the echo beat signal does not match the phase noise obtained by the auxiliary interferometer,resulting in the introduction of additional residual phase noise.In order to solve this problem,the influence of target motion in frequency modulated continuous wave(FMCW)lidar system on the traditional light source phase noise compensation method is analyzed,and a new method of light source phase noise compensation by estimating target distance and velocity is proposed.The light source of the system is a distributed feedback(DFB)laser,which uses direct current modulation for linear sweep.The experimental results of moving objects show that the measurement accuracy is increased by 41 times by using the new light source phase noise compensation method,and the distance and speed can be accurately measured at the same time.

关 键 词：调频连续波 激光雷达 预失真 相位噪声补偿 分布反馈激光器 

分 类 号：TN256[电子电信—物理电子学]