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Rail vehicle positioning system

  • US 5,129,605 A
  • Filed: 09/17/1990
  • Issued: 07/14/1992
  • Est. Priority Date: 09/17/1990
  • Status: Expired due to Term
First Claim
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1. A rail vehicle positioning system of the type used to provide a locomotive engineer with information relating to the position of a locomotive;

  • said system comprising in operative combination;

    a GPS global positioning system receiver disposed on said locomotive for providing a GPS signal;

    a wheel tachometer disposed on said locomotive for providing a tachometer signal;

    means for calibrating said wheel tachometer to correct for any error by comparing said GPS signal with said tachometer signal;

    and means for generating a position, speed, direction, and acceleration signal in response to said GPS signal and said tachometer signal.

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