Radio communication system for use in tunnels

Details Radio communication system for use in tunnels Radio communication system for use in tunnels

1998-01-07

2000-03-21

Vo, Nguyen

Telecommunications

Carrier wave repeater or relay system

Monitoring

455523, H04B 160, H04B 1500

Patent

active

06041216&

ABSTRACT:
A radio communications system is intended for use by trains in a tunnel. This system includes an antenna subsystem which incorporates a radiating coaxial cable disposed along the length of the tunnel and extending beyond the portals thereof, including surface coverage for transition. Plural bi-directional, in-line amplifiers are inserted along the length of the radiating coaxial cable at predetermined intervals for amplifying the RF signals carried by the radiating coaxial cable. A monitoring repeater and a control repeater are provided along with an interface for joining the two repeaters to the radiating coaxial cable. A monitoring subsystem includes an end-of-train device and a head-of-train device. A control subsystem includes the control encoder located in a lead locomotive for encoding control input signals for the lead locomotive, a control transmitter for transmitting the encoded control signal to other locomotives, and a control receiver located in each other locomotive for receiving the encoded control signal.

REFERENCES:
patent: 3609247 (1971-09-01), Halstead
patent: 4777652 (1988-10-01), Stolarczyk et al.
patent: 4879755 (1989-11-01), Stolarczyk et al.
patent: 5093929 (1992-03-01), Stolarczyk et al.
patent: 5230080 (1993-07-01), Fabre et al.
patent: 5301082 (1994-04-01), Stolarczyk et al.
patent: 5404570 (1995-04-01), Charas et al.
patent: 5603080 (1997-02-01), Kallander et al.

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