气象雷达中雨滴谱回波参数建模技术研究

针对双极化雷达的主要回波参数差分折射率Zdr和线性退振比LDR与雨滴关系的问题，该文重点研究了雨滴的形状轴比，取向分布对这两个参数的影响。与以往不同的是，该文采用了更贴近实际的fisher分布取代了原有的高斯分布的取向情况。同时在一定滴谱分布下也就是确定了轴比分布的条件下，仿真得到了LDR和Zdr然后与其他文献进行了比较。仿真表明，这两个参数既取决于折射率因子加权轴比，又同时取决于取向角分布的均值和方差。

Raindrop Echo Parameter Modeling Technology Research in Weather Radar

To solving the problem of the relation between the two main dual-polarization radar echo parameters, differential refraction（ Zdr）, linear depolarization ratio（LDR） and rain droplets, this paper mainly studies the effects of axis ratio, orientation distribution of rain droplets on Zdr and LDR. This paper adopts the Fisher distribution to replace the Gaussian orientation distribution which is more close to the actual distribution. At the same time, on the condition that the drop size distribution （DSD） is determined, we get the Zdr and LDR through simulation for comparing the results with other papers. Simulation shows LDR and Zdr is not only determined by reflectivity weighted mean axis ratio（ RWMAR）, but also the mean value and variance of the orientation distribution.