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Geofencing and route adherence in global positioning system with signals from fewer than three satellites

  • US 7,492,315 B2
  • Filed: 03/28/2007
  • Issued: 02/17/2009
  • Est. Priority Date: 03/28/2007
  • Status: Active Grant
First Claim
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1. A method for determining a minimum distance from a global positioning system receiver to a reference location, the method comprising:

  • (a) receiving at least one global positioning system signal from no more than two global positioning system satellites in the global positioning system receiver;

    (b) determining, from the at least one global positioning system signal received in step (a), a set of possible locations at which the global positioning system can be located; and

    (c) determining a minimum distance from the set of possible locations to the reference location as the minimum distance from the global positioning system receiver to the reference locationwherein, in step (a), said at least one global positioning system signal is received from two said global positioning system satellites and wherein step (b) comprises determining a solution plane approximating a solution surface comprising the set of possible locations near the reference location.

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