基于模糊逻辑的地物回波识别方法及效果检验  

THE ALGORITHM AND VERIFICATION OF GROUND CLUTTER IDENTIFICATION BASED ON FUZZY LOGIC

作　　者：黄兴友[1] 李盈盈 张帅[1] 黄书荣 韦凯华 HUANG Xing-you;LI Ying-ying;ZHANG Shuai;HUANG Shu-rong;WEI Kai-hua(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,NUIST,Nanjing 210044,China;Guangdong Meteorological Observatory,Guangzhou 510640,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,江苏南京210044 [2]广东省气象台,广东广州510640

出　　处：《热带气象学报》2018年第3期305-313,共9页Journal of Tropical Meteorology

基　　金：国家自然科学基金项目(41475034);国家重点基础研究发展计划(973计划)项目(2013CB430101)共同资助

摘　　要：提出一种基于模糊逻辑的新一代天气雷达地物回波识别方法。通过统计典型个例的回波特性得到隶属度函数及权重,并根据反射率因子范围的不同设置相应的隶属度函数及权重。该方法针对降水强度量级的回波,即反射率因子不小于15 d Bz,对于非降水强度回波则不进行处理,从而保留对短临预报具有指示作用、且强度较弱的特征回波,如晴空湍流回波以及阵风锋回波。根据雷达回波垂直方向连续性对剔除地物回波所产生的"空洞"进行填补,从而进一步减小地物回波对雷达数据质量造成的影响。最后通过两种方法对识别算法进行效果检验,结果表明该算法对地物回波有显著的识别效果。This paper proposes a method for ground clutter identification based on the fuzzy logic technique in CINRAD.Derived from the characteristics of radar echoes in typical cases,membership functions and their weights vary with radar reflectivity.This method deals with the echo at precipitation intensity of no less than 15 dBz but leaves the echo at nonprecipitation intensity untreated,thus keeping weak characteristic echoes useful for nowcasting of such features as clear air turbulence and gust fronts.To weaken the influence from the ground clutter further,gaps created by removing ground clutter will be filled based on the continuity of echoes in the vertical direction.This algorithm of identification has been tested in two ways and the result shows that it performs well in ground clutter identification.

关 键 词：天气雷达 地物识别 模糊逻辑 回波特性 质量控制 

分 类 号：P412.25[天文地球—大气科学及气象学]