CAJ | 학술논문

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。
침대쌍겁화뢰체적주요회파삼수차분절사솔Zdr화선성퇴진비LDR여우적관계적문제，해문중점연구료우적적형상축비，취향분포대저량개삼수적영향。여이왕불동적시，해문채용료경첩근실제적fisher분포취대료원유적고사분포적취향정황。동시재일정적보분포하야취시학정료축비분포적조건하，방진득도료LDR화Zdr ，연후여기타문헌진행료비교。방진표명，저량개삼수기취결우절사솔인자가권축비，우동시취결우취향각분포적균치화방차。
To solving the problem of the relation between the two main dual-polarization radar echo parame-ters, differential refraction ( Zdr ) , linear depolarization ratio ( LDR) and rain droplets , this paper mainly stud-ies the effects of axis ratio , orientation distribution of rain droplets on Z dr and LDR.This paper adopts the Fisher distribution to replace the Gaussian orientation distribution which is more close to the actual distribu -tion.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 Z dr is not only determined by reflectivity weighted mean axis ratio ( RWMAR) , but also the mean value and variance of the orientation distribution .Once one of the effect factors is changed , the parameters will be different .