光学学报, 2011, 31 (6): 0606002, 网络出版: 2011-05-18
啁啾调幅激光雷达对距离和速度的零差探测
Homodyne Detection of Distance and Velocity by Chirped-Amplitude Modulated Lidar
摘要
构建了一种用线性调频信号去调制激光振幅的激光相干雷达实验系统。系统使用窄线宽激光器、马赫曾德尔(M-Z)幅度调制器以及光纤零差光路,利用直接数字合成(DDS)技术所生成的啁啾信号对激光振幅进行调制,完成了对目标靶运动速度与距离的同时测量,对速度距离分辨率和误差进行了测试和分析,对信噪比(SNR)与系统探测能力的关系进行了研究。实验结果表明该系统可以达到毫米每秒的测速精度和厘米级的测距精度,探测灵敏度优于0.1 nW。
Abstract
A system of coherent ladar which is based on chirp amplitude modulation is built. The system is made up of narrow-line-width laser, Mach-Zehnder intensity modulator, and fiber homodyne detection optics. The measurement of velocity and distance of the target is completed based on chirp signal generated by direct digital synthesis(DDS), both the resolution and error of velocity and range are measured and analyzed, and research on relation between signal-to-noise ratio (SNR) and system detection power is also completed. Experimental data indicates that velocity accuracy reaches mm/s, range accuracy reaches cm and sensitivity is better than 0.1 nW.
于啸, 洪光烈, 凌元, 舒嵘. 啁啾调幅激光雷达对距离和速度的零差探测[J]. 光学学报, 2011, 31(6): 0606002. Yu Xiao, Hong Guanglie, Ling Yuan, Shu Rong. Homodyne Detection of Distance and Velocity by Chirped-Amplitude Modulated Lidar[J]. Acta Optica Sinica, 2011, 31(6): 0606002.