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Collision warning system

  • US 5,252,978 A
  • Filed: 07/16/1992
  • Issued: 10/12/1993
  • Est. Priority Date: 07/27/1991
  • Status: Expired due to Fees
First Claim
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1. A method of providing a collision warning signal for at least one vehicle, comprising the steps of:

  • (a) transmitting from the surface of the earth a radio signal;

    (b) receiving at the surface of the earth, a radio signal returned by a vehicle in response to the radio signal transmitted in step (a);

    (c) determining an elapsed time between the transmitting of the radio signal and the receiving of the corresponding returned radio signal;

    (d) determining the position of the vehicle at least in part in dependence upon the elapsed time determined in step (c);

    (e) comparing the position of the vehicle determined in step (d) with terrain data stored in a data base; and

    (f) generating a warning signal based on the comparing in step (e) if predetermined parameters are satisfied.

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