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METHOD OF ACQUIRING ERROR CORRECTION VALUE OF REFERENCE FREQUENCY, TERMINAL DEVICE, AND RECORDING MEDIUM

  • US 20080068258A1
  • Filed: 08/29/2007
  • Published: 03/20/2008
  • Est. Priority Date: 09/14/2006
  • Status: Active Grant
First Claim
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1. A method of causing a terminal device, which receives satellite signals from a plurality of satellite positioning system (SPS) satellites and locates a position, to acquire an error correction value of a reference frequency, the method comprising:

  • periodically calculating a first drift of a local oscillator using the reference frequency;

    calculating a search range of the satellite signal using the first drift;

    calculating a second drift of the local oscillator using a reception frequency of the satellite signal;

    calculating a reference frequency error which is an error of the reference frequency by calculating a difference between the first drift and the second drift; and

    calculating an error correction value of the reference frequency by subjecting a plurality of the reference frequency errors to a statistical process.

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