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Device for the transmission of information through the rails between a railway track and a group of vehicles running along this track

  • US 4,420,133 A
  • Filed: 03/17/1980
  • Issued: 12/13/1983
  • Est. Priority Date: 07/17/1978
  • Status: Expired due to Term
First Claim
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1. A system for transmission of data along the rails of a railway track through a plurality of successive, contiguous zones, said data transmitted to a train passing along said track in a given direction of travel, said system comprising:

  • (1) a plurality of resonance circuits, each connected across the rails of said zone, pairs of said resonance circuits defining said zones therebetween, and said zones being independent of a block system of said railway track,(2) an alternating current generator for each zone having a predetermined frequency outside frequency bands of said block system, said predetermined frequency producing a carrier frequency for the data to be transmitted.(3) for each given zone, said pairs of said resonance circuits defining the given zone tuned to the carrier frequency of said generator within said given zone,(4) means for modulating said carrier frequency for each zone corresponding to the data to be transmitted thereby providing a data signal for each zone,(5) a plurality of insulated conductive windings in the form of conductive loops, one of said windings within each zone and positioned between the rails of said tracks adjacent the downstream side of each zone with respect to the direction of train travel, for each given zone said one winding positioned immediately proximate one of said pairs of resonance circuits of said given zone and remote from the other of said pair of resonance circuits of said given zone,(6) means for coupling the winding within each zone to receive the data signal from the modulating means of each zone, and(7) a receiver mounted onboard said train at a position near the forward end of said train along the direction of travel of said train, said receiver tuned to the respective carrier frequencies of each zone for receiving the data signals of each zone.

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