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Method and apparatus for locating an object using reduced number of GPS satellite signals or with improved accuracy

  • US 5,977,909 A
  • Filed: 03/13/1998
  • Issued: 11/02/1999
  • Est. Priority Date: 03/13/1998
  • Status: Expired due to Term
First Claim
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1. A method for identifying a location of an object to be tracked comprising the steps of:

  • measuring at said object to be tracked data related to propagation time differences between signals transmitted from a plurality of satellites and received at said object to be tracked;

    transmitting said data by said object to be tracked to a central station; and

    calculating at said central station the location of said object to be tracked based upon the transmitted data, a predetermined database containing information constraining the location of the object to be tracked, and data derived from at least one receiver apart from said object to be tracked receiving said signals from said plurality of satellites.

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