Communication system for guideway operated vehicles

Details Communication system for guideway operated vehicles Communication system for guideway operated vehicles

1975-06-06

1976-09-07

Kunin, Stephen G.

Railway switches and signals

Train dispatching

Train telegraphy or telephony

246 63C, 246122R, 246187B, 343711, B61L 108

Patent

active

039790916

ABSTRACT:
A communication system for track or guideway operated vehicles is disclosed. The system is adapted for two-way transmission between a vehicle and a wayside station and is provided with a transmission line of special configuration along the wayside. The transmission line comprises three conductors each having a wave configuration with the waves disposed in three-phase relationship and a return conductor which is also of wave configuration. The vehicle transmitter section is provided with an inductive loop which is coupled with the transmission line and is energized with a continuous wave signal. This produces signals on the three phase conductors which have an envelope frequency proportional to vehicle speed and a phase relationship corresponding to the relative position of the wave configurations of the phase conductors. Thus, vehicle speed may be derived by measuring frequency and vehicle position may be derived by counting cycles or pulses from a given starting point. Direction of the vehicle travel can be derived from the phase sequence of the signals in the phase conductors. At the base station, the receiver section is provided with means for squaring each of the phase signals and summing the squared signals to develop a continuous signal, i.e. one which has an amplitude independent of the position of the transmitting loop along the transmission line. The two way voice communication channel and a two way data communication channel is also provided utilizing the above mentioned transmission line. The transmission line configuration and the configuration of the transmitting and receiving loops are such that the system is immune to far field radiation.

REFERENCES:
patent: 3327111 (1967-06-01), Frech
patent: 3527897 (1970-09-01), Sugi
patent: 3772640 (1973-11-01), Aver

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