双偏振天气雷达双通道一致性分析与校准  

Analysis and Calibration of Dual-channel Consistency for Dual-polarization Weather Radar

作　　者：李斐斐[1] 邵楠[1] 虞海锋 步志超[1] 郭泽勇 LI Fei-fei;SHAO Nan;YU Hai-feng;BU Zhi-chao;GUO Ze-yong(Meteorological Observation Center of China Meteorological Adminstration,Beijing 100081,China;Beijing Metstar Co.,Ltd.,Beijing 100094,China;Yangjiang Meteorological Administration,Yangjiang 529500,China)

机构地区：[1]中国气象局气象探测中心,北京100081 [2]北京敏视达雷达有限公司,北京100094 [3]阳江市气象局,阳江529500

出　　处：《科学技术与工程》2020年第3期1076-1080,共5页Science Technology and Engineering

基　　金：重大自然灾害监测预警与防范专项(2017YFC1501701)。

摘　　要：差分反射率和差分相位与双偏振天气雷达双通道一致性密切相关。以S波段双偏振天气雷达为例,首次对包括旋转关节在内的接收通道一致性、除天线反射体以外的收发全链路一致性进行测试分析,并采用逐径向校准的方法对双通道偏差进行校准。结果表明:校准前差分反射率因子最大变化范围为0.04 dB,标准差为0.0120 dB,差分相位最大变化范围为1.60°,标准差为0.3857°;校准后差分反射率因子最大变化范围为0.03 dB,标准差为0.0051 dB,差分相位最大变化范围为0.20°,标准差为0.0336°。Differential reflectivity Z DR and differential phase ΦDP are closely related to the dual-channel consistency of dual-polarization weather radar.The S-band dual-polarization weather radar produced by Beijing METSTAR Co.,Ltd.,was taken as an example.The receiving channel consistency including the rotating joint and the full-link consistency except the antenna reflector were tested and analyzed.In addition,the dual-channel deviation was corrected by using the radial calibration method.The results show that the range of Z DR before calibration is 0.04 dB,the standard deviation is 0.012 dB.The range ofΦDP before calibration is 1.60°,the standard deviation is 0.3857°.The range of Z DR after calibration is 0.03 dB,the standard deviation is 0.0051 dB.The range ofΦDP after calibration is 0.20°,the standard deviation is 0.0336°.

关 键 词：旋转关节 双通道一致性 差分反射率因子 校准 

分 类 号：TN959.4[电子电信—信号与信息处理]