X波段双线偏振雷达不同衰减订正法对比分析  

Comparison of Different Attenuation Correction Methods Using X-band Dual Polarimetric Radar

作　　者：王晗 刘黎平[2] 张扬[2,4] 

机构地区：[1]浙江省大气探测技术保障中心,杭州310017 [2]中国气象科学研究院灾害天气国家重点实验室,北京100081 [3]成都信息工程大学,成都610225 [4]南京信息工程大学,南京210044

出　　处：《气象科技》2018年第1期1-9,15,共10页Meteorological Science and Technology

基　　金：国家自然科学基金项目(41675023)资助

摘　　要：X波段双线偏振雷达的衰减是影响其回波强度(ZH)和差分反射率因子(ZDR)应用的主要问题,影响了雷达的探测精度以及降水估测的精度。考虑到传播相移率(K_(DP))在低信噪比情况下数据质量问题,本文对比了4种订正方法(Z_H-K_(DP)法,整段ZPHI法,20库ZPHI法,80库ZPHI法)的订正效果,将广州S波段双线偏振雷达数据作为标准来评判佛山X波段双线偏振雷达衰减订正效果,由于两部雷达的位置差异,为了得到精确的点对点(方位角、仰角、距离库)的数据对,对广州S波段双线偏振雷达数据进行坐标转换以及插值处理,通过与广州S波段雷达数据进行对比分析相对偏差以及相关系数等,得出ZPHI订正法的效果要优于Z_H-K_(DP)综合订正法。The attenuation of X-band dual polarimetric radar is the main problem in application of echo strength and differential reflectivity factor（Z_H and Z_（DR））.It has a strong impact on the radar detecting precision and rainfall estimation.In consideration of the quality problem of K_（DP） in the low SNR situation,we used four kinds of attenuation correction methods：Z_H-K_（DP） and three kinds of segmented ZPHI methods.To have a better judgment of the Foshan X-band radar correction results of different methods,we used the data of the Guangzhou S-band radar as standards.But due to the different position information of two radars,the S-band radar data must be processed by coordinate conversion and interpolation processing.Then we got data pairs with same elevation,azimuth and range.After qualitative and quantitative analysis,we find that ZPHI is superior to Z_H-K_（DP） in relative deviation and correlation coefficient.

关 键 词：X波段双线偏振雷达 衰减订正 ZH-KDP订正法 ZPHI降水廓线订正法 

分 类 号：TN955.2[电子电信—信号与信息处理]