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Method for the transmission of informations and/or instructions

  • US 4,655,421 A
  • Filed: 10/23/1984
  • Issued: 04/07/1987
  • Est. Priority Date: 02/21/1983
  • Status: Expired due to Fees
First Claim
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1. A system for transmitting information commands to a railway vehicle travelling on a railway track, comprising:

  • at least one ground station located along the railway track;

    each said ground station comprising a plurality of passive transponders, electrically independent from each other and spaced apart longitudinally of the track in a predetermined sequence of spacing;

    each transponder comprising passive receiving means for receiving electromagnetic oscillations and passive transmitting means electrically connected to said passive receiving means and spaced from the receiving means for retransmitting the received electromagnetic oscillations, all said passive receiving means having the same first geometric relationship to the longitudinal center plane of said railway track and all of said passive transmitting means having a second different geometric relationship to the longitudinal center plane of the track, said two relationships being symmetrical about the longitudinal center plane of said railway tack;

    the system further comprising a terminal located on the railway vehicle and comprising at least one transmitter in alignment with said passive receiving means and arranged to transmit electromagnetic oscillations to the passive receiving means of the transponders, and at least one receiver in alignment with said passive transmitting means and arranged to receive the retransmitted electromagnetic oscillations from the passive transmitting means of each transponder as the receiver passes thereby;

    whereby the sequence and nature of the signals transponded by said ground station as said railway vehicle travels past said ground station constitutes a code group consisting of individual digits transponded respectively by successive transponders of said ground station;

    said code group having information command code meaning and communicating said meaning from said ground station to said railway vehicle; and

    a decoder on said railway vehicle for decoding the information command code thus received by the receiver.

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