一种双极化气象雷达自适应谱极化滤波方法  

Adaptive Spectral Polarization Filter Design for Dual-polarization Weather Radar

作　　者：安孟昀 殷加鹏[1] 黄建开 庞晨 李永祯[1] 王雪松[1] AN Mengyun;YIN Jiapeng;HUANG Jiankai;PANG Chen;LI Yongzhen;WANG Xuesong(State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子信息系统复杂电磁环境效应国家重点实验室,长沙410073

出　　处：《雷达学报（中英文）》2022年第3期408-417,共10页Journal of Radars

基　　金：国家自然科学基金(61971429,62171447);博士后国际交流计划引进项目(48132);湖南省科技创新人才计划优秀博士后创新人才项目(2020RC2042);国防科技大学科研计划项目(ZK21-25)。

摘　　要：针对双极化气象雷达中非气象回波的滤除问题,该文提出一种基于詹森-香农散度原理的自适应移动谱去极化比(AMsDR)滤波方法。该方法根据不同方位向回波的谱去极化比分布情况,利用气象回波和杂波在距离-多普勒图上的特征差异实现气象回波的保留和杂波的滤除。与现有固定阈值的移动谱去极化比滤波器相比,AMsDR滤波方法可根据不同方位向降雨和杂波的回波差异自适应地选择滤波阈值,提高杂波抑制与降雨保留性能。This paper proposes an adaptive filtering method called the Adaptive Moving spectral Depolarization Ratio(AMsDR)filter to mitigate the clutter for dual-polarization weather radar based on Jensen-Shannon divergence principle.Specifically,the spectral depolarization ratio in the range-Doppler domain is the main variable distinguishing precipitation from clutter.The AMsDR filter can remove the clutter and noise and retain precipitation based on the difference of the spectral polarization feature and the spectral continuity of precipitation and clutter.The AMsDR filter can adaptively select the filter threshold depending on the echo difference between precipitation and clutter in different azimuths.Thus,the performance of the proposed filter is better than that of the current methods.

关 键 词：双极化 气象雷达 詹森-香农散度 杂波抑制 自适应谱极化滤波 

分 类 号：TN95[电子电信—信号与信息处理]