An algorithm for estimating rain rate by a dual‐frequency radar
An algorithm for estimating rain rate by a dual‐frequency radar
复制标题
双频雷达降雨率估算算法
DOI：
10.1029/rs018i005p00697
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
M. Fujita
中科院分区：
文献类型：
--
作者：
M. Fujita
本文研究了双频雷达在雨衰减波段的雨率估计算法。估计是基于最小二乘法的概念。在该算法中，接收到的回波功率的比值在相邻的距离单元在每个频率被用来消除一些未知的和/或不确定的因素，如雷达校准因子。该算法，这是适用于当在一个频率的一部分回波丢失，由于雨衰减，也被开发。在估计算法中，假定比衰减与降雨率的关系（k-R关系）和有效Z因子与降雨率的关系（Z-R关系）均为通常的幂律形式。k-R关系是固定的，而Z-R关系则是用实测量和降雨率的最小二乘回归形式表示的。计算机仿真实验的结果证明了该算法的有效性。
This paper concerns an estimation algorithm of rain rates for a dual-frequency radar at rain-attenuating bands. The estimations are made based on the concept of least squares. In the algorithm, the ratios of received echo powers at adjacent range bins at each frequency are used to eliminate some unknown and/or undetermined factors, such as radar calibration factors. The algorithm, which is applicable when a part of echoes at one frequency is missing due to rain attenuation, is also developed. In the estimation algorithm, the relationship between specific attenuation and rain rate (k-R relationship), and that between effective Z factor and rain rate (Z-R relationship), are assumed to be expressed by the usual power law form. The k-R relationships are fixed; however, the Z-R relationships are expressed by the least squares regression form in terms of the measured quantities and the rain rates. The results of computer simulation experiments are described to demonstrate the validity of the present algorithm.