雨介质的等效复折射指数系统辨识研究  

System identificaiton study of equivalent complex refractionconstant of rain medium

作　　者：弓树宏[1] 黄际英[1] 王芳[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071

出　　处：《西安电子科技大学学报》2004年第5期674-677,共4页Journal of Xidian University

基　　金：国家自然科学基金资助项目(60171010);"十五"预研项目(41303030503)

摘　　要：将雨介质视为一个离散随机系统,利用系统辨识方法结合电波传播理论对此系统进行了线性判定,建立了系统模型,得到了毫米波段雨介质的等效复折射指数的计算公式.然后,利用所得公式计算得到的等效复折射指数预测了降雨衰减率,预测值与ITU R推荐公式计算结果及实测值基本符合,说明文中所使用的方法是有效的.该方法对其他离散介质也是适用的.The paper regards rain meida as a discrete random system. By estimating the linearity of the system combining the system identificaiton measure with the radio wave propagation theory, the system model is found. Then, the formula for calculating the equivalent complex refraction constant of rain media is deduced. Attenuation induced by rain is prediceted with the equivalent complex refraction constant. The attenuation predicted is nearly consistent with that calculated by the formula recommended in ITU-R and measured results, which testifies that the method used in the paper is effective. It is also helpful for other discrete media.

关 键 词：数系 等效 公式计算 折射指数 系统辨识 介质 随机系统 降雨衰减 ITU-R 电波传播 

分 类 号：TN011[电子电信—物理电子学] O435.1[机械工程—光学工程]