S波段与X波段天气雷达探测参量差异及组网融合处理研究  

Study on Differences and Fusion Mosaic Methods of Parameters Between S-Band and X-Band Weather Radars

作　　者：刘于新 马建立 陈明轩 史朝[1] LIU Yuxin;MA Jianli;CHEN Mingxuan;SHI Zhao(College of Electronic Engineering,Chengdu University of Information Technology,Chengdu 610225;Institude of Urban Meteorology,CMA,Beijing 100089)

机构地区：[1]成都信息工程大学电子工程学院,成都610225 [2]北京城市气象研究院,北京100089

出　　处：《气象》2024年第4期488-498,共11页Meteorological Monthly

基　　金：国家重点研发计划(2022YFC3003901)资助。

摘　　要：随着X波段双偏振雷达探测网的增多,与S波段双偏振雷达开展组网观测愈发具有必要性。利用北京地区2021年7月27日的一次强对流天气过程的观测资料,对X波段双偏振雷达组网观测值和S波段双偏振雷达观测值进行一致性定量分析,结果表明:两者观测的反射率因子(Z)一致性好,差分反射率(Z_(DR))差异集中在0 dB值附近,Z≥30 dBz时,差分相移率(K_(DP))差异显著。根据观测值差异特征,比较了探测参量直接融合和距离指数权重融合两种数据融合方式,通过分析偏振参量垂直剖面图发现,融合后可以相互弥补探测盲区,K_(DP)通过距离指数权重融合的方式过渡更加自然。本文融合效果可供不同波段雷达融合组网提供参考。With the increasing number of X-band dual-polarization radar networks,making network observation of X-band dual-polarization radars and S-band dual-polarization radars has become more necessary.Based on the observation data of the severe convective weather in Beijing on 27 July 2021,the consistency of polarization parameters between the X-band radar network and S-band dual-polarization radar is quantitatively analyzed.The results indicate that Beijing X-band radar networks and S-band dual-polarization radar have a favorable consistency on reflectivity factor(Z),and the differences of differential reflectivity(Z_(DR))are concentrated near 0 dB,specific differential phase(K_(DP))has significant difference in the area where Z≥30 dBz.Based on the characteristics of the observed polarization parameter differences,two fusion mosaic methods of parameters are compared:one is direct fusion mosaic and the other is distance-weighted with an exponent.By analyzing vertical cross-section(VCS)of polarization parameters,we see that the blind area of radars could be made up for each other,and K_(DP)can have a more natural transition through the fusion mosaic method distance-weighted with an exponent.The fusion effect could provide some references for different band radars needing fusion mosaic.

关 键 词：S波段双偏振雷达 X波段雷达网 融合组网 

分 类 号：P411[天文地球—大气科学及气象学] P412