高原气象

高原气象 >

2015 , Vol. 34 >Issue 1: 279 - 287

DOI: https://doi.org/10.7522/j.issn.1000-0534.2013.00102

论文

C波段车载双偏振雷达ZDR资料处理方法研究

  • 吴林林 ,
  • 刘黎平 ,
  • 袁野 ,
  • 纪雷 ,
  • 李妙英
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  • 南京信息工程大学, 南京 210044;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. 安徽省人工影响天气办公室, 合肥 230061;4. 解放军理工大学 气象海洋学院, 南京 211101

收稿日期: 2012-12-28

  网络出版日期: 2015-02-28

基金资助

2012年度省局气象科技发展基金项目(KM201209); 公益性行业(气象)科研专项(GYHY201306040); 北极阁基金(BJG201209)

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Study on ZDR Processing Algorithm of C-Band Mobile Dual Polarization Radar

  • WU Linlin ,
  • LIU Liping ,
  • YUAN Ye ,
  • JI Lei ,
  • LI Miaoying
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  • Nanjing University of Information Science and Technology, Nanjing 210044, China;2. State-Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;3. Anhui Weather Modification Office, Hefei 230061, China;4. People's Liberation Army University of Science and Technology Institute of Marine meteorological, Nanjing 211101, China

Received date: 2012-12-28

  Online published: 2015-02-28

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摘要

本文介绍了车载双偏振雷达参数ZDR的处理方法, 首先分析了信噪比SNR对ZDR参数的影响, 得出信噪比SNR至少要>18 dB, ZDR数据才可信; 其次分析了雷达附近的不同类型遮挡物对ZDR参数的影响, 结果表明, 尖状的遮挡物容易造成ZDR正的偏差, 房屋等遮挡物容易造成负偏差, 而对树林等遮挡物, 偏差的正负变化很大.随着遮挡程度的减小, ZDR的变化幅度变小; 针对ZDR的系统误差, 使用反射率因子结合ΦDP增量可以很好的进行计算, ZDR系统误差在短时间内变化不大, 但是, 随时间变化而逐渐变化, 需要进行实时订正; 最后, 使用FIR滤波方法进行KDP参数计算并用于ZDR衰减订正, 取得了不错的效果.针对业务应用, 给出了实时处理ZDR参数的业务流程图.

关键词： ZDR; 系统误差; 遮挡分析; KDP

本文引用格式

吴林林 , 刘黎平 , 袁野 , 纪雷 , 李妙英 . C波段车载双偏振雷达ZDR资料处理方法研究[J]. 高原气象, 2015 , 34(1) : 279 -287 . DOI: 10.7522/j.issn.1000-0534.2013.00102

Abstract

ZDR Processing algorithm of C-band mobile dual polarization radar was recommend. First the effect of SNR on parameter ZDR was analysed. The result shows that SNR should be at least more than 18 dB, then ZDR data can be credible; secondly the effect of blockage around radar on ZDR was analysed,The results show that the pointed shape blockage is easy to cause the ZDR positive deviation, the house and building is easy to cause the negative bias, while the shelter of the woods, the positive and negative deviation of great change. With the decreasing degree of occlusion, changes in amplitude of ZDR becomes small; aiming at the system biases of ZDR, put forward the method by combining reflection factor and ΦDP increment to judge light rain area and get it, from the time series analysis of ZDR system bias, we concluded that the ZDR system bias must be adjust in time; in the end, Using the FIR filtering method for KDP calculation and use it for attenuation correction; Aiming at work application, provide the transaction flow diagram for real-time processing ZDR parameter.

Key words： ZDR; System biases; Blockage analysis; KDP

参考文献

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