基于线性调频脉冲压缩的相干激光雷达距离与速度测量

Distance and Velocity Measurement of Coherent Lidar Based on Chirp Pulse Compression.

作者信息

Yang Jing, Zhao Bin, Liu Bo

机构信息

University of Chinese Academy of Sciences, Beijing 100049, China.

Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China.

出版信息

Sensors (Basel). 2019 May 20;19(10):2313. doi: 10.3390/s19102313.

DOI:10.3390/s19102313

PMID:31137481

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6566813/

Abstract

To explore lidar, which can simultaneously measure the distance and velocity of long-distance targets at high resolution, a coherent lidar system based on chirp pulse compression has been studied. Instead of a conventional acousto-optic modulator (AOM), we used an electro-optic modulator (EOM) to modulate a continuous 1550 nm laser. Using EOM, the resolution of the lidar is higher and the system simpler. The electrical waveform used to modulate the laser is a chirp pulse, which has a sweeping bandwidth of 98 MHz, a duration of 10 µs, and a pulse repetition rate of 20 kHz. The result of 100 measurements shows that the system may yield accurate information in range, ±22 cm, and radial velocity, ±1.066 cm/s.

摘要

为了探索能够以高分辨率同时测量远距离目标的距离和速度的激光雷达，研究了一种基于线性调频脉冲压缩的相干激光雷达系统。我们使用电光调制器（EOM）代替传统的声光调制器（AOM）来调制连续的1550 nm激光。使用电光调制器，激光雷达的分辨率更高且系统更简单。用于调制激光的电波形是一个线性调频脉冲，其扫描带宽为98 MHz，持续时间为10 µs，脉冲重复频率为20 kHz。100次测量的结果表明，该系统在距离测量上的精度可达±22 cm，在径向速度测量上的精度可达±1.066 cm/s，能够提供准确的信息。