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首页> 外文期刊>Advances in Geosciences >Dual-polarization C-band weather radar algorithms for rain rate estimation and hydrometeor classification in an alpine region
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Dual-polarization C-band weather radar algorithms for rain rate estimation and hydrometeor classification in an alpine region

机译：双极化C波段天气雷达算法，用于高寒地区的降雨率估算和水凝物分类

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摘要

Dual polarization is becoming the standard for new weather radar systems. Incontrast to conventional weather radars, where the reflectivity is measuredin one polarization plane only, a dual polarization radar providestransmission in either horizontal, vertical, or both polarizations whilereceiving both the horizontal and vertical channels simultaneously. Sincehydrometeors are often far from being spherical, the backscatter andpropagation are different for horizontal and vertical polarization.Comparing the reflected horizontal and vertical power returns and theirratio and correlation, information on size, shape, and material density ofcloud and precipitation particles can be obtained. The use of polarimetricradar variables can therefore increase the accuracy of the rain rateestimation compared to standard Z-R relationships of non-polarimetricradars. It is also possible to derive the type of precipitation from dualpolarization parameters, although this is not an easy task, since there isno clear discrimination between the different values. Fuzzy logic approacheshave been shown to work well with overlapping conditions and impreciselydefined class output.In this paper the implementation of different polarization algorithms forthe new Austrian weather radar on Mt. Valluga is described, and firstresults from operational use are presented. This study also presents firstobservations of rain events in August 2007 during the test run of the radar.Further, the designated rain rate estimation and hydrometeor classificationalgorithms are explained.
机译：双极化正成为新气象雷达系统的标准。与仅在一个偏振平面上测量反射率的常规天气雷达相反，双偏振雷达提供水平，垂直或两种偏振状态下的透射，同时同时接收水平和垂直通道。由于水流通常不是球形，因此水平极化和垂直极化的背向散射和传播是不同的。比较反射的水平和垂直功率返回及其比率和相关性，可以获得有关云和降水粒子的大小，形状和物质密度的信息。因此，与非极化雷达的标准 Z-R 关系相比，极化雷达变量的使用可以提高降雨率估算的准确性。尽管这不是一件容易的事，但由于在两个不同的值之间没有明显的区别，因此从双极化参数中得出降水的类型也是可能的。模糊逻辑方法已被证明在重叠条件和不精确定义的类输出条件下可以很好地工作。 本文针对奥地利新型气象雷达在山上实现了不同的极化算法。描述了瓦卢加（Valluga），并介绍了使用的第一结果。这项研究还介绍了雷达试运行期间2007年8月的降雨事件的首次观测结果，并解释了指定的降雨率估算和水凝物分类算法。

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