Research on Key Communication Technologies of Intelligent HSR Based on LEO Satellite Networks
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 investiga-ted,which aims to achieve low-latency and highly reliable satellite-to-ground communication links.
intelligent high-speed railwaylow-earth-orbit(LEO)satellite networkwireless accesslow-latency trans-missionDoppler frequency offsetbeam switching
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