基于相干激光雷达的双偏振探测技术  

Dual polarization detection technology based on coherent LiDAR

作　　者：罗晓翩 冯力天[1] 尹微 靳国华[1] 彭涛[1] 董吉辉 张永科[1] 周鼎富[1] LUO Xiaopian;FENG Litian;YIN Wei;JIN Guohua;PENG Tao;DONG Jihui;ZHANG Yongke;ZHOU Dingfu(Key Laboratory of LiDAR and Device,Southwest Institute of Technical Physics,Chengdu 610041,China)

机构地区：[1]西南技术物理研究所激光雷达与器件技术重点实验室,成都610041

出　　处：《激光技术》2025年第1期8-13,共6页Laser Technology

基　　金：四川省科技计划资助项目(2022YFG0352)。

摘　　要：为了在大气遥感中对风场和退偏比进行联合分析,提出了一种双偏振相干探测方法。基于传统相干测风激光雷达(LiDAR),设计了能实现正交偏振信号分集接收的探测系统,并推导了此系统下大气退偏比计算原理;搭建系统并进行了实验,在不同天气条件下,对比观测平行偏振光和垂直偏振光径向风速信息,结合实时大气退偏比参数双维度描述大气状态。结果表明,激光发射能量为100 J、脉宽为400 ns、距离分辨率为30 m时,阴天、雾天、雨天、晴天径向风速测程分别可达6.0 km、5.5 km、3.0 km、3.0 km;大气退偏比测程为2.0 km、2.0 km、1.0 km、1.0 km;测程内双通道径向风速的一致性不随天气而变化。该研究为大气多要素一体化探测提供了参考。Aiming at the joint analysis of wind field and depolarization ratio in atmospheric remote sensing,a dual-polarization coherent detection method was proposed.Based on traditional coherent wind light detection and ringing(LiDAR),a detection system that can achieve diversity reception of orthogonal polarization signals was designed,and the calculation principle of atmospheric depolarization ratio under this system was derived.A systematic experiment was conducted to compare and observe the radial wind speed information of parallel polarized light and vertically polarized light under different weather conditions,and to describe the atmospheric state in combination with real-time atmospheric depolarization ratio parameters in two dimensions.The results show that when the laser emission energy is 100 J,the pulse width is 400 ns,and the distance resolution is 30 m,the radial wind speed range in cloudy,foggy,rainy and sunny days can reach 6.0 km,5.5 km,3.0 km and 3.0 km,respectively.The range of atmospheric depolarization ratio is 2.0 km,2.0 km,1.0 km,1.0 km;the consistency of the dual-channel radial wind speed in the range does not change with the weather.This study provides a reference for the integrated detection of multiple atmospheric elements.

关 键 词：激光技术 激光雷达 双偏振接收 相干多普勒测风 大气退偏比 

分 类 号：TN958.98[电子电信—信号与信息处理] TN249[电子电信—信息与通信工程]