多次散射影响的激光雷达斜程能见度反演方法  

Lidar Slant-Range Visibility Retrieval Method Based on Effect of Multiple Scattering

作　　者：熊兴隆[1] 王婕 刘逵 马愈昭[1] Xiong Xinglong;Wang Jie;Liu Kui;Ma Yuzhao(Key Laboratory for Advanced Signal Processing,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学天津市智能信号与图像处理重点实验室,天津300300

出　　处：《激光与光电子学进展》2022年第4期435-442,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金民航联合基金(U1833111);中央高校基本科研业务费项目中国民航大学专项(3122019068)。

摘　　要：针对低能见度天气条件下的多次散射影响,提出一种根据多次散射激光雷达方程反演斜程能见度的改进方法。首先,根据后向散射峰值拟合散射相函数,采用半解析蒙特卡罗法计算多次散射修正系数m;其次,根据Collis法求解能见度级数值,并将相应m值代入多次散射激光雷达方程;然后,采用Fernald法反演消光系数,求解斜程能见度;使用激光雷达探测不同能见度等级的雾霾和大雨天气回波信号进行实验验证,对所提拟合方法和常用Henyey-Greenstein(HG)函数方法得到的斜程能见度结果进行比较。结果表明,在雾霾天气条件下斜程能见度的结果相差10.9%,大雨天气条件下,斜程能见度相差5.6%。所提改进方法提高了后向散射激光雷达反演斜程能见度的准确性。Aiming at the effect of multiple scattering under low visibility weather conditions, an improved method is proposed for inverting slant-range visibility based on the multiple scattering lidar equation. First, the semi-analytical Monte Carlo method is used to calculate the ratio m of multiple scattering to single scattering based on the backscattering peak fitting the scattering phase function. Second, using the Collis method, the visibility level value is obtained, and the corresponding m value is substituted into the multiple scattering lidar equation. Then, the Fernald method is used to invert the extinction coefficient and solve the slant-range visibility. Experiments were performed on the echo signals of haze and heavy rain with different visibility levels detected by lidar, and the slant-range visibility results obtained using the fitting method in this paper and the commonly used Henyey-Greenstein(HG) function method were compared. The results show that the slant-range visibility difference is 10. 9% under haze conditions and 5. 6% under heavy rain conditions. The proposed method improves slant-range visibility accuracy inverted by the backscattering lidar.

关 键 词：散射 多次散射影响 散射相函数 半解析蒙特卡罗法 后向散射 斜程能见度 

分 类 号：TN958.98[电子电信—信号与信息处理]