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大气科学  2012 

X波段双线偏振气象雷达反射率的衰减订正

DOI: 10.3878/j.issn.1006-9895.2011.11075

Keywords: X波段双线偏振雷达,衰减订正,自适应约束算法

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Abstract:

X波段天气雷达的强衰减是影响其探测精度与应用推广的主要问题。本文旨在寻求适用于降水过程中对X波段双偏振雷达进行衰减订正的一种方法。在订正前先对雷达数据进行了质量控制和预处理;在分析了国内外已有订正方法的基础上,选择并改进了自适应约束算法作为雷达反射率进行衰减订正的方法;最后进行方法的效果验证。既对衰减订正前后反射率与同时段S波段雷达反射率作对比,又对偏振参数KDP~ZH、AH~ZH之间关系的变化进行分析,不仅如此,还直接与地面降水实况作比较等。分析表明,对X波段双线偏振雷达进行反射率衰减订正后的效果显著优于订正前,特别是,当存在较大范围(含对流型)降雨时,采用此种订正方法可以明显提高降水的估测精度。

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