基于电磁理论和热力学方法的太赫兹波空-天-地-海衰减模型  

A Universal Attenuation Model of Terahertz Wave in Space-Air-Ground-Ocean Channel Medium Based on Electrodynamics and Thermal Physics

作　　者：杨志荣[1] 高惟君 韩充 YANG Zhirong;GAO Weijun;HAN Chong(Terahertz Wireless Communication Laboratory,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学太赫兹无线通信实验室,上海200240

出　　处：《无线电通信技术》2024年第1期96-105,共10页Radio Communications Technology

摘　　要：太赫兹(Terahertz, THz)频段(0.1~10 THz)可以提供数十GHz的连续带宽,以实现6G通信系统中的天地一体化网络(Space-Air-Ground Integrated Network, SAGIN)。然而,太赫兹波与SAGIN中信道介质的相互作用仍然是一个谜。太赫兹波在太空-大气-地表-海面(空-天-地-海)信道中所遭受到的吸收和散射效应可被建模为太赫兹光子与介质粒子的碰撞过程,在此基础上结合电磁理论和热力学方法提出了通用的太赫兹波空-天-地-海衰减模型。相比已有模型,该模型考虑了各类粒子(包括凝聚态粒子、单个分子和自由电子)所导致的衰减效应,涵盖了太赫兹波在传播过程中所能遇到的衰减效应。基于该模型对太赫兹波在大气和外层空间的传播损耗进行数值计算,计算结果表明,除自由空间损耗(Free-Space Path Loss, FSPL)外,其他衰减效应在50 km以上的大气都可以忽略不计,而在50 km以下的大气中则需要考虑这些衰减效应。Providing continuous bandwidth over several tens of GHz,the Terahertz band(0.1~10 THz)supports Space-Air-Ground Integrated Network(SAGIN)in 6G and beyond wireless networks.However,it is still mystery how THz waves interact with the channel medium in SAGIN.In this paper,the absorption and scattering effect in terahertz space-air-ground-ocean channels are modeled as a collision process between terahertz photons and medium particles,based on which a universal space-air-ground-ocean attenuation model is proposed for terahertz waves.The proposed model incorporates the attenuation effects induced by particles including condensed particles,molecules,and free electrons.The propagation loss of THz waves in the atmosphere and the outer space are numerically assessed.Numerical results indicate that the attenuation effects except Free-Space Path Loss(FSPL)are all negligible at the altitude higher than 50 km while they need to be considered in the atmosphere lower than 50 km.

关 键 词：太赫兹通信 传播损耗 信道 天地一体化网络 

分 类 号：TN92[电子电信—通信与信息系统]