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System for identification and determination of the moment of passage of a multiple number of moving bodies at a given point on their path

  • US 4,551,725 A
  • Filed: 09/03/1982
  • Issued: 11/05/1985
  • Est. Priority Date: 09/07/1981
  • Status: Expired due to Fees
First Claim
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1. A system for identification and determination of the moment of passage of a multiple number of moving bodies over a given line intersecting their path, comprising in combination:

  • a plurality of mobile devices mounted respectively on said moving bodies, each of said mobile devices comprising transmitter means capable of transmitting a respective radio identification signal at a frequency which is representative of said moving body;

    a fixed receiving antenna set up on said line and to receive the respective identification signals;

    means for processing the identification signals received by the receiving antenna to identify each respective moving body which emitted it and the time each respective body passes by said receiving antenna;

    a fixed transmitter located in proximity to said given line for emitting a control signal controlling the transmitters of said mobile devices;

    each of said mobile devices further comprisingmeans for receiving said control signal,means for generating said identification signal at said representative frequency,first means connected between said receiving means and said generating means for converting said control signal into a reference signal with respect to which the value of said representative frequency signal is established,second means also connected between said receiving means and said generating means for converting said control signal into a gate signal,power supply means, andgate means responsive to said gate signal for connecting said power supply means to said generating means and said transmitter means for applying power thereto only as long as said control signal is received by said receiver means.

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