60 GHz与300 GHz频段航天器舱内通信信道特性

太赫兹(THz)技术有望在航天器舱体轻质化和舱内高容量传输需求方面发挥重要作用.本文构建了典型航天器舱内毫米波60 GHz与太赫兹300 GHz频段信道三维仿真模型，基于射线追踪法获取了两种典型发射机部署位置下的无线信道特性，提取并分析了路径损耗指数、阴影衰落因子、莱斯K因子、均方根时延扩展和角度扩展等关键信道参数，研究了发射机的部署位置对特定频段舱内信道的影响.结果表明：相同环境下，频率越高、路径损耗与莱斯K因子越大而时延扩展越小；相同频率下，发射机部署于舱内角落的信道特性优于部署于舱内上壁中央.本文所研究的无线信道特性将为未来复杂舱内环境下的太赫兹通信系统设计和部署提供启示.

Channel characterization for spacecraft capsule communication at 60 GHz and 300 GHz

Terahertz (THz) technology is anticipated to be crucial to spacecraft capsule weight reduction and the requirement for high-capacity transmission inside the capsule. In the millimeter-wave 60 GHz and terahertz 300 GHz bands, the typical spacecraft cabin channel is modelled in three dimensions in this article. Using the ray-tracing technique, the radio channel characteristics of the deployment places of the two representative transmitters are determined. It was looked into how the channel in a particular frequency band cabin would change depending on where the transmitter would be deployed. The results demonstrated that, in the same environment, the higher the frequency is, the higher the path loss and the Rice factor K are and the lower the delay expansion is. At the same frequency, the channel characteristics are better when the transmitter is placed in the corner in the cabin as opposed to its upper-wall center. The radio channel characteristics examined in this research will provide ideas for how terahertz communication systems will be designed and implemented in complicated cabin environments in the future.