卫星互联网若干关键技术研究  

Research on several key technologies of satellite Internet

作　　者：张更新 王运峰 丁晓进[2,3] 洪涛 刘子威[1,2] 张晨[1,2] ZHANG Gengxin;WANG Yunfeng;DIGN Xiaojin;HONG Tao;LIU Ziwei;ZHANG Chen(College of Telecommunications&Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;Institute of Satellite Communication,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;School of Internet of Things,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]南京邮电大学卫星通信研究所,江苏南京210003 [3]南京邮电大学物联网学院,江苏南京210003

出　　处：《通信学报》2021年第8期1-14,共14页Journal on Communications

基　　金：国家自然科学基金资助项目(No.91738201)。

摘　　要：卫星互联网具备全球广域无缝覆盖能力,是未来陆海空天一体化网络的重要组成部分。首先,讨论了卫星互联网体系架构,包括系统一般组成、组网方式、工作过程等,研究了卫星互联网场景下的宽带和窄带业务模型建模方法,以提取业务的空时分布不均特征;然后,分析了频谱共享中的星间同频干扰问题,初步分析表明未来非地球同步轨道(NGSO)星座间会存在较严重的同频干扰,探讨了低轨卫星波束成形设计和高轨卫星跳波束设计方案,通过高效挖掘空间域资源,可显著提升系统容量;最后,对卫星互联网领域的几个技术发展方向进行了展望。Satellite Internet has the ability of global seamless coverage,which will be an important part of the future land-sea-air-space integrated network.Firstly,the architecture of satellite Internet was discussed,which included the gen-eral composition of the system,networking mode,working process,etc.Secondly,the methods of modeling broadband and narrowband traffic were proposed to extract the uneven space-time distribution characteristics of traffic for satellite Internet.Then,the co-frequency interference of spectrum-sharing was analyzed,showing that there would be more se-rious co-frequency interference among different non-geostationary satellite orbit(NGSO)constellations in the future.Next,the schemes of both beamforming design for low earth orbit satellite and beam-hopping design for high orbit satel-lite were explored,which could significantly improve the system capacity through efficient mining of space-domain re-sources.Finally,the development prospect of several technologies of satellite Internet were given.

关 键 词：卫星互联网 体系架构设计 业务模型 波束成形 干扰分析 

分 类 号：TN92[电子电信—通信与信息系统]