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Method for setting search band widths of a GPS receiver

  • US 5,408,239 A
  • Filed: 03/04/1993
  • Issued: 04/18/1995
  • Est. Priority Date: 03/16/1992
  • Status: Expired due to Term
First Claim
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1. A method of setting a search band in a GPS receiver, the method comprising the steps of:

  • a) reading from a memory a stored oscillator offset value, and determining if said stored oscillator offset value is within a predetermined reference range;

    b) if said stored offset value is within said predetermined reference range, setting said search band around a center frequency determined by a doppler effect of said GPS satellite and said stored oscillator offset value and searching over a first range of frequencies; and

    c) if said stored offset value is outside said predetermined reference range, setting said search band around a center frequency determined by said doppler effect of said GPS receiver and said stored oscillator offset value and searching over a second frequency range, said second frequency range being wider than said first range of frequencies.

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