Radio communication system for use in tunnels

摘要

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.