北京SA雷达电磁干扰回波特征及质控算法初探  

Characteristics of Electromagnetic Interference Echo of SA Radar and Quality Control Method in Beijing

作　　者：仰美霖[1,2] 江源 刘黎平[2] 陈明轩[1] 马建立 李思腾 YANG Meilin;JIANG Yuan;LIU Liping;CHEN Mingxuan;MA Jianli;LI Siteng(Institute of Urban Meteorology,China Meteorological Administration,Beijing 100089,China;State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China;Natinal Meteorological Center,Beijing 100081,China)

机构地区：[1]中国气象局北京城市气象研究所,北京100089 [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]国家气象中心,北京100081

出　　处：《干旱气象》2018年第5期802-812,共11页Journal of Arid Meteorology

基　　金：北京市自然科学基金(8184072);北京市科技计划课题(Z161100004516018);国家重点研发计划(2017YFC1502102)共同资助

摘　　要：北京地区电磁环境复杂,雷达回波电磁干扰较为严重,且类型多样,对雷达资料的应用特别是雷达资料同化和降水估测等定量研究影响严重。本文收集2008年8月至2013年3月北京SA雷达基数据,挑选出无降水、有降水天气过程共932个雷达基数据,研究分析北京SA雷达电磁干扰的回波特征及出现原因。在此基础上,利用并改进干扰回波自动识别算法对北京SA雷达电磁干扰回波开展初步质控研究,并进行效果检验。结果表明,北京SA雷达电磁干扰回波有5种类型,分别为散点状、窄条幅状、宽条幅状、满屏螺旋带及麻点、高仰角层不明干扰回波。电磁干扰多出现在低仰角层,且对强度场影响较严重,而对径向速度场和谱宽影响较小,电磁干扰回波的出现与天气状况无关,且出现时间无规律。产生电磁干扰回波的原因主要有固定方向的远距离干扰、同频或临频的近距离干扰、雷达信号处理故障或硬件老化等。自动识别算法对于散点状、窄条幅状及高仰角层不明干扰回波处理效果较好,而对于满屏螺旋带及麻点、宽条幅状电磁干扰回波处理效果较差。The electromagnetic environment is complex in Beijing,which leads to severe electromagnetic interference with multiple types on radar echo,so these interferences have very serious effects on radar data applications,especially on radar data assimilation and quantitative estimation of precipitation.In this paper,932 samples of SA radar data in Beijing under non-precipitation or precipitation weather processes were selected from 2008 to 2013,the characteristics of electromagnetic interference echo of SA radar in Beijing and their reasons were analyzed.And on this basis,the automatic identification algorithm to interference echo of SA radar in Beijing was applied and improved,so as to improve the quality of radar data.Meanwhile,the effect of algorithm on interference echo was tested.The results show the electromagnetic interferences on SA radar echo in Beijing were divided into five types,in cluding scattered dot shape electromagnetic interference echo,narrow banner shape electromagnetic interference echo,wide banner shape electromagnetic interference echo,full screen spiral belt and pitting shape electromagnetic interference echo,unknown disturbance echo on high elevation layers,respectively.Most interference echoes appeared on low elevation layers,and it primarily affected on reflectivity field,while the effect on radial velocity field and spectral width was less.The electromagnetic interference echo in radial velocity field appeared the purple with distance folding(RF).The occurrence of electromagnetic interference echo had nothing to do with weather conditions,and the occurrence time was random.The reasons of occurring electromagnetic interference were mainly long-distance single frequency point interference with fixed direction,the short-distance same frequency or adjacent frequency interference with certain bandwidth and the signal processing failure and hardware aging.The appalication effect of impoved algorithm was good on scattered point shape,narrow banners shape and unknown electromagnetic interference ech

关 键 词：北京SA雷达 电磁干扰回波特征 质量控制 

分 类 号：P414[天文地球—大气科学及气象学]