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METHODS AND SYSTEMS FOR MAKING A GPS SIGNAL VITAL

  • US 20090043435A1
  • Filed: 08/07/2007
  • Published: 02/12/2009
  • Est. Priority Date: 08/07/2007
  • Status: Abandoned Application
First Claim
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1. A method for making the derived position from a global positioning system (GPS) receiver mounted onboard a train or other vehicle, vital, the method comprising the steps of:

  • receiving GPS data from a plurality of satellites at a first GPS receiver located off the train, the first GPS receiver being at a first known position;

    determining any corrections necessary for each of the plurality of satellites by comparing the positions reported by the satellites to the first known position;

    receiving additional GPS data at a second GPS receiver located off the train, the second GPS receiver being at a second known location which may be the same or different from the first known location;

    validating the corrections calculated using the GPS data from the first GPS receiver using the additional GPS data from the second GPS receiver;

    if the corrections are valid, transmitting a message including the corrections to the train; and

    using the corrections and GPS data from a third GPS receiver to determine the position of the train.

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