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Calibration and correction system for satellite position location systems

  • US 6,816,111 B2
  • Filed: 01/03/2003
  • Issued: 11/09/2004
  • Est. Priority Date: 12/13/2002
  • Status: Active Grant
First Claim
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1. A method of correcting a GPS receiver comprising:

  • producing a first frequency locked to a cellular network signal;

    generating a second frequency in a GPS oscillator during a first time period;

    computing a first error based upon comparisons of said first and second frequencies during said first time period;

    computing a second error base upon comparisons of said first and second frequencies during a second time period;

    providing an error function from said first and second errors;

    predicting a GPS oscillator error using said error function for a next time period; and

    correcting said GPS oscillator in said next time period responsive to said predicted GPS oscillator error.

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