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Method and apparatus for acquiring satellite positioning system signals

  • US 6,133,874 A
  • Filed: 08/11/1998
  • Issued: 10/17/2000
  • Est. Priority Date: 03/08/1996
  • Status: Expired due to Term
First Claim
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1. A method for reducing search time to acquire satellite positioning system (SPS) signals in a satellite positioning system (SPS) receiver, said method comprising:

  • determining a first pseudorange to a first SPS satellite;

    determining an approximate location of said SPS receiver;

    determining an estimated pseudorange for a second pseudorange to a second SPS satellite, said estimated pseudorange being determined from said approximate location and said first pseudorange;

    searching for time of arrival of SPS signals from said second SPS satellite in a range determined by said estimated pseudorange.

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