【作者】 李贺；

【导师】 杨晋生；

【作者基本信息】 天津大学 ， 电子科学与技术， 2021， 硕士

【摘要】 随着第六代无线通信网络的全球兴起,卫星、无人机等空间网络已成为构建空天地海一体化通信系统的有效补充。全频谱资源将被进一步挖掘,其中太赫兹无线通信技术以其兼具微波通信和光通信的特点,成为未来超高速通信的主要解决方案,在空间通信方面引起广泛关注。本文以研究星间太赫兹通信场景的信道特性为目标,通过信道建模与仿真分析得到信道关键参数。工作内容概括如下:首先基于空间环境特点,建立了太赫兹星间通信系统场景模型,对太赫兹星间通信链路进行了数值仿真,得到星间静态场景和动态场景下卫星与空间站的相对位置以及空间站姿态跟随时间变化的结果。其次使用适用于星间太赫兹通信的多射线信道模型,该模型基于射线跟踪算法,计算了太赫兹信号在传播过程中产生的直射、反射、散射和绕射分量,探究了太赫兹波在卫星与空间站之间的传播过程,实现了对星间信道特性的准确模拟。之后基于仿真对场景进行计算,分析了星间静态场景和动态场景下不同的信道特性,具体阐述了影响星间通信质量的三个模块:空间传输损耗、多径效应和多普勒频移。探究了空间通信中多径的生灭现象以及多径效应对太赫兹通信系统性能的影响。最后根据仿真结果萃取了信道时-空-频特征参数,探究了时间、空间、频域的色散效应,对太赫兹星间通信的多维度信道特性做了全面表征,对参数结果作了统计性分析,从仿真的角度验证了信道模型的准确性。本文所提出的信道模型和仿真方法可用于评估星间太赫兹波通信系统的性能,仿真结果为星间无线信道系统的设计提供了参考。更多还原

【Abstract】 With the global rise of the sixth-generation wireless communication network,space networks such as satellites and drones have become an effective supplement to the construction of an integrated air-space-ground-sea communication system.Full spectrum resources will be further excavated,in which terahertz wireless communication technology,with its characteristics of both microwave communication and optical communication,will become the main solution of ultra-high-speed communication in the future,which has attracted widespread attention in space communication.In this paper,the channel key parameters are obtained through channel modeling and simulation analysis to study the channel characteristics of inter-satellite terahertz communication scenarios.The content of the work is summarized as follows:Firstly,based on the characteristics of the space environment,the scenario model of the terahertz inter-satellite communication system is established,and the terahertz inter-satellite communication link is numerically simulated.The results of the relative position of the satellite and the space station and the time change of the space station’s state in the static scene and the dynamic scenarios are obtained.Secondly,a multi-ray channel model suitable for inter-satellite terahertz communication is used in this paper.Based on the ray tracing algorithm,the model calculates the direct,reflected,scattered and diffracted components of the terahertz signal in the process of propagation.The propagation process of the terahertz wave between the satellite and the space station was explored,and the accurate simulation of the inter-satellite channel characteristics is realized.Then the scenario model is calculated based on simulation,and the different channel characteristics in the static and dynamic scenarios between satellites are explored through simulation.The three modules that affect the quality of inter-satellite communication are analyzed in detail,they are space transmission loss,multipath effect and Doppler frequency shift.The birth and death phenomenon of multipath in space communication and the influence of multipath effect on the performance of terahertz communication system are explored.Finally,according to the simulation results,the channel time-space-frequency characteristic parameters are extracted,the dispersion effects of time,space and frequency domain are explored,and the multi-dimensional channel characteristics of terahertz inter-satellite communication are fully characterized,and the statistical characteristics of the parameter results are analyzed.The analysis verifies the accuracy of the channel model from the perspective of simulation.The channel model and simulation method proposed in this paper can be used to evaluate the performance of the inter-satellite terahertz wave communication system,and the simulation results provide a reference for the design of the inter-satellite wireless channel system.更多还原