X波段双偏振气象雷达差分相位质量控制  

Differential Phase Quality Control for X-Band Dual Polarization Weather Radar

作　　者：徐星 闫贺 周晔 汪玲 孙小航 李益兵 朱岱寅 XU Xing;YAN He;ZHOU Ye;WANG Ling;SUN Xiaohang;LI Yibing;ZHU Daiyin(Key Laboratory of Radar Imaging and Microwave Photonics,Ministry of Education,College of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;AVIC Leihua Electronic Technology Research Institute,Wuxi 214000,China;Nanjing Hengdian Electronics Co Ltd,Nanjing 211106,China)

机构地区：[1]南京航空航天大学电子信息工程学院雷达成像与微波光子技术教育部重点实验室,江苏南京211106 [2]中国航空工业集团公司雷华电子技术研究所,江苏无锡214000 [3]南京恒电电子有限公司,江苏南京211106

出　　处：《雷达科学与技术》2022年第6期671-677,687,共8页Radar Science and Technology

基　　金：民机专项资助项目(No.MJ-2018-S-28)。

摘　　要：气象雷达差分相位的质量控制是通信和遥感遇到的一个基本问题。前向散射引起的差分相位估计的准确性对于测量降水量,反射率的衰减订正具有重要意义,尤其对于X波段的双偏振雷达。而后向差分相位的值则包含了非瑞利散射和降水微物理等有价值的信息,因此需要准确地分离出前向散射引起的差分相位和后向差分相位。但在雷达射线传播路径中可能会存在其他非气象目标的干扰或受到周围某单频点电磁波的干扰,导致接收到的电磁波存在噪声因素,从而使测量得到的总差分相位值不准确,因此还需要考虑对接收得到的差分相位先进行质量控制。本文基于X波段双线偏振多普勒天气雷达,提出了对测量得到的差分相位进行质量控制的方法,有效地减少噪声的影响,再利用处理得到的总差分相位分离前向散射引起的差分相位和后向差分相位。结果表明,该方法可以有效地对非降水回波干扰引起数据的大振幅进行平滑,分离得到的前向散射相位满足理论规律。The quality control of differential phase of meteorological radar is a basic problem encountered by communication and remote sensing.The accuracy of differential phase estimation caused by forward scattering is very important for precipitation measurement and attenuation correction of reflectance,especially for X-band dual-polarization radar.The value of backward differential phase contains valuable information such as non-Rayleigh scattering and precipitation microphysics,so it is necessary to accurately separate the backward differential phase caused by forward scattering.However,in the propagation path of radar ray,there may be interference from other non-meteorological targets or electromagnetic wave from a single point around.As a result,the received electromagnetic wave has noise factor,which makes the total differential phase value obtained by mea-surement inaccurate.It is needed to perform quality control over the received difference phase.In this paper,based on the X-band dual-polarization Doppler weather radar,a quality control method for the measured differential phase is proposed to effectively reduce the impact of noise,and then the total differential phase is processed to separate the differential phase caused by forward scattering and backward differential phase.The results show that this method can effectively smooth the large amplitude of the data caused by non-precipitation echo interfe-rence,and the separated forward scattering phase meets the theoretical regulation.

关 键 词：X波段双线偏振多普勒天气雷达 差分相位 后向差分相位 质量控制 

分 类 号：TN959.4[电子电信—信号与信息处理]