SYSTEM FOR EXTENDING BI-DIRECTIONAL SATELLITE RADIO COMMUNICATIONS IN TUNNELS
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United States of America Patent
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Issued Date -
Mar 19, 2009
app pub date -
Mar 30, 2006
filing date -
Mar 30, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention consists of a communication system that relays a satellite signal inside railway tunnels and relays the signals transmitted inside said tunnels towards the satellite, in such a way as to assure to vehicles transiting inside the tunnels a perfect transmission and reception quality even in the absence of satellite visibility. The system is based on a fixed terminal, for gallery illumination, connected to a fixed satellite station, and on a mobile terminal installed on the vehicle, connected to a mobile satellite terminal. The system automatically effects a switching action between satellite channel and radio channel in the tunnel, and vice versa, to assure the continuity of the vehicle-satellite connection. The system finds elective application for railway vehicles.
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