| 天气雷达反射率因子图像中三体散射自动识别 |
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| 引用本文： | 王萍,杜雪峰,徐考基.天气雷达反射率因子图像中三体散射自动识别[J].天津大学学报(自然科学与工程技术版),2014,47(8):711-718. |
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| 作者姓名： | 王萍 杜雪峰 徐考基 |
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| 作者单位： | 天津大学电气与自动化工程学院,天津,300072 |
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| 基金项目： | 中国气象局气象探测中心2012年新一代天气雷达建设业务软件系统开发及应用 |
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| 摘 要： | 三体散射的准确识别可以有效降低强冰雹的误警率、提高预报强冰雹的时效性.在详细分析三体散射产生机理的基础上,将三体散射按照其图像特点定义成2种类型.设计标准模板,在将搜索区域进行标准化变换的配合下成功解决了楔状的、短的三体散射的自动识别;用链码技术将走向一致的区域边界的比例定量地描述出来,以此解决长直的三体散射的自动识别.实验表明,该方法对短三体散射的区域断裂和长三体散射的远端粘连具有不敏感性,对三体散射的总击中率达到94.8%,误警率不足1%.
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| 关 键 词： | 三体散射 楔状识别 链码特征提取 冰雹预警 |
Automatic Identification of Three-Body Scatter Spike in the Doppler Radar Reflectivity Image |
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| Wang Ping,Du Xuefeng,Xu Kaoji.Automatic Identification of Three-Body Scatter Spike in the Doppler Radar Reflectivity Image[J].Journal of Tianjin University(Science and Technology),2014,47(8):711-718. |
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| Authors: | Wang Ping Du Xuefeng Xu Kaoji |
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| Institution: | 1.School of Electrical Engineering and Automation , Tianjin University, Tianjin300072, China) |
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| Abstract: | The accurate identification of three-body scatter spike （TBSS） can reduce the false alarm rate of strong hail and improve the timeliness of strong hail forecast.This paper provides a detailed analysis of the formation of the threebody scatter spike and then defines it into two classes.Designing the standard template,normatively transforming the target area solve the problem of short,cuneiform-shaped TBSS identification; and then the chain code is used to calculate the main direction of the boundary for identifying the long and straight TBSS.Test shows that the method is not good at the identification of the short TBSS with broken region or the long TBSS whose end is connected with others.Identification rate of TBSS is 94.8％ and false alarm rate is less than 1％. |
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| Keywords: | three-body scatter spike(TBSS) cuneiform-shaped identification feature extraction from the chain code hail warning |
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