Device for the detection of the position of a railway vehicle

Details Device for the detection of the position of a railway vehicle Device for the detection of the position of a railway vehicle

1979-07-05

1981-06-23

Miller, J. D.

Railway switches and signals

Block-signal systems

Automatic

246 63R, 246249, B61L 2502

Patent

active

042746116

ABSTRACT:
In a train control system wherein emitter beacons are located at predetermined points on the track near to one of the running rails, a device for detecting the position of a vehicle running on the railway track. It comprises into each beacon a radiating vertical-axis coil powered by an alternating current of a given frequency and, on board the vehicle, near to the corresponding rail, a pick-up unit including two pairs of receiver coils the axes of which are horizontal and perpendicular to the running rails. The associated circuits comprise two differential amplifiers connected to at least to two band-pass filters and a multiplier circuit in order to generate a positive signal when and only when the beacon is located between the two pairs of coils and the frequency of the beacon is the central frequency of the filters.

REFERENCES:
patent: 3201583 (1965-08-01), dit Rolle
patent: 3609676 (1971-09-01), Jauquet et al.

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