地空路径太赫兹波雨天衰减特性分析  

Characteristic analysis of rain attenuation for terahertz waves transmission along earth-space paths

作　　者：曹相春[1] 郝建红[1] 赵强[2] 张芳[2] 范杰清[1] 董志伟[2] CAO Xiangchun;HAO Jianhong;ZHAO Qiang;ZHANG Fang;FAN Jieqing;DONG Zhiwei(School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China;Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]北京应用物理与计算数学研究所,北京100094

出　　处：《太赫兹科学与电子信息学报》2023年第8期971-976,共6页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金联合资助项目(U1730247);高功率微波技术重点实验室资助项目(6142605200301)。

摘　　要：雨滴的散射和吸收作用会严重增加地空链路上太赫兹波的传输损耗,降低无线通信的性能。为实现太赫兹波在地空链路上的传输应用,必须对太赫兹波在降雨环境中的传输特性进行深入研究。本文对原有的雨衰模型进行了修正,基于Mie理论,分析了降雨率的变化对地空链路上太赫兹波传输的影响,并与原有模型的计算结果进行了对比。结果表明:在整个太赫兹频段,雨衰减损耗会随降雨率的增加而增大,随频率的增加先增大后减小,且高频太赫兹波段相对0.1~1 THz频段范围的雨衰损耗更小;同时,当频率超过1 THz时,大气窗口越靠近10 THz,损耗越小,在降雨天气环境进行无线通信传输时将更具有通信优势,且频率越低,天顶角越大,模型修正前后的差异性更加明显。The scattering and absorption of raindrops will seriously increase the transmission loss of terahertz waves in the earth-space links and reduce the performance of wireless communications.In order to realize the transmission application of terahertz waves in the earth-space links,it is necessary to deeply study the transmission characteristics of terahertz waves in the rainfall environment.In this paper,the original rain attenuation model is further modified,and the influence of rainfall rate on terahertz wave transmission over the earth-space links is analyzed based on Mie theory.The calculation results are compared with that of the original model,and it shows that,in the whole terahertz bands,the rain attenuation loss increases with the increase of rainfall rate,and increases first and then decreases with the increase of frequency.There exists less rain attenuation loss in the high-frequency terahertz bands than in 0.1~1 THz bands.When the frequency exceeds 1 THz,the closer the atmospheric window is to 10 THz,the smaller the loss will be,and it will have more advantages in wireless communication transmission in rainy weather environment.The lower the frequency,the greater the zenith angle,and the difference of the rain attenuation model before and after modification will be more obvious.

关 键 词：太赫兹 雨衰减 MIE理论 散射 

分 类 号：TN011[电子电信—物理电子学] O441.4[理学—电磁学]