网络化衰减订正方法在北京X波段网络化雷达中的应用  

The application of network attenuation correction method on the X-band network radar in Beijing

作　　者：李思腾 马建立 陈明轩 李林 仰美霖 邢峰华 LI Siteng;MA Jianli;CHEN Mingxuan;LI Lin;YANG Meilin;XING Fenghua(Institute of Urban Meteorology,Beijing 100089,China;Beijing Municipal Meteorological Observation Center,Beijing 100089,China;Hainan Institute of Meteorological Sciences,Haikou 570203,China)

机构地区：[1]北京城市气象研究院,北京100089 [2]北京市气象探测中心,北京100089 [3]海南省人工影响天气中心,海口570203

出　　处：《气象学报》2021年第5期804-816,共13页Acta Meteorologica Sinica

基　　金：国家重点研发计划项目(2018YFC1507502);国家重点研发计划重点专项(2018YFF0300100);北京市气象局科技项目(BMBKJ201705003)。

摘　　要：衰减是影响X波段雷达数据质量的主要因素之一,直接影响到X波段雷达在强对流监测预警中的应用效果。文中在分析中、外雷达衰减订正方法的基础上,选择并改进了一种利用雷达网中不同雷达相互订正的方法,该方法通过不断迭代运算,使订正误差达到最小,形成了适合于网络化X波段雷达的反射率因子衰减订正方法。订正结果与原始雷达数据以及差分相位(φ_(DP))订正法结果进行对比,并且还同时与北京S波段雷达观测数据进行了对比。结果表明:衰减订正对X波段雷达穿透强降水后的回波以及探测距离较远的回波效果比较明显,订正后的回波与S波段雷达观测结果比较吻合。Attenuation is one of the main factors that affect the data quality of X-band radars, which directly affects the application effectiveness of X-band radars in severe convection monitoring and early warning. Based on the analysis of different radar attenuation correction methods, both domestic and abroad, this study improves one of the radar attenuation correction methods that utilizes mutual correction among different radars in the radar network, and establishes a reflectivity factor attenuation correction method that is suitable for networked X-band radars. With the new method, the correction error is minimized through continuous iterative computation. The correction outputs are compared with original radar data and results using the differential phase(φ_(DP)) correction method as well as observations of the Beijing S-band radar. It is found that the attenuation correction is more effective for the X-band radar echoes that penetrate heavy rainfall or at long detection distance, and the corrected echoes are consistent with the Sband radar observations.

关 键 词：X 波段 网络化雷达 衰减订正 双偏振 

分 类 号：P412.25[天文地球—大气科学及气象学]