智能高速铁路中基于低轨卫星网络的通信关键技术研究  

Research on Key Communication Technologies of Intelligent HSR Based on LEO Satellite Networks

作　　者：张嘉驰 刘留[2] 周涛[2] 蔺伟 梁轶群 ZHANG Jiachi;LIU Liu;ZHOU Tao;LIN Wei;LIANG Yiqun(Department of Police Information,Shandong Police College,Jinan 250200,China;School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China;Signal&Communication Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]山东警察学院警务信息系,山东济南250200 [2]北京交通大学电子信息工程学院,北京100044 [3]中国铁道科学研究院集团有限公司通信信号研究所,北京100081

出　　处：《铁道学报》2024年第8期69-77,共9页Journal of the China Railway Society

基　　金：国家自然科学基金(61931001);中国国家铁路集团有限公司科技研究开发计划(N2023G060)。

摘　　要：智能高速铁路是构建现代综合交通运输体系的重要组成部分,建立支持高移动性、高速率、高可靠性、高实时性的通信链路是列车安全运行的基石。针对高速铁路空间跨度范围大、轨旁通信设备成本高、越区切换频繁等问题,探讨基于低轨卫星互联网技术实现车地通信的可能性及关键技术。分析智能高速铁路通信业务需求并根据不同的业务类型采用对应的专网或公网进行承载。研究了基于公网卫星互联网络的高速铁路无线接入架构。并在此基础上进一步探讨了面向智能高速铁路的卫星接入与低时延传输、星地链路多普勒频偏、星内/间波束切换等关键技术,以期实现低时延、高可靠的星地通信链路。The intelligent high-speed railway(HSR)is a pivotal part in the construction of a modern comprehensive transportation system.Establishing communication links with high-speed supportability,high-data-rate,high-reliability,and high-real-time is the cornerstone of safe train operations.In light of the typical challenges of large spatial span,high cost of trackside communication equipment,and frequent handovers for HSRs,this paper explored the feasibility and key technologies of train-ground communication based on the low-earth-orbit(LEO)satellite Internet system.Specifically,an analysis was given on the requirements of communication services for intelligent HSRs and the use of private or public networks to transfer the corresponding services.The paper further studied the public LEO satellite network-based HSR wireless access architecture.On this basis,3 key technologies including satellite access and low-latency transmission,Doppler frequency offset of satellite-ground link,and intra-satellite/inter-satellite beam switching were further investigated,which aims to achieve low-latency and highly reliable satellite-to-ground communication links.

关 键 词：智能高速铁路 低轨卫星网络 无线接入 低时延传输 多普勒频偏 波束切换 

分 类 号：U285[交通运输工程—交通信息工程及控制]