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GPS signal acquisition system and method

  • US 7,949,035 B2
  • Filed: 12/15/2006
  • Issued: 05/24/2011
  • Est. Priority Date: 06/16/2006
  • Status: Active Grant
First Claim
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1. A method for locating a target cell among a plurality of cells corresponding to a GPS (Global Position System) signal, with the plurality of cells forming a two-dimensional array, wherein each row of the two-dimensional array corresponds to a code bin of the GPS signal and each column of the two-dimensional array corresponds to a frequency bin of the GPS signal, the method comprising:

  • (1) providing a plurality of counters, each corresponding to one of the plurality of cells;

    (2) receiving the GPS signal in a unit of time in a detecting frequency bin;

    (3) decoding the received GPS signal with each of the corresponding code bins with respect to first cells corresponding to the detecting frequency bin to generate a corresponding decoding result in a decoding vector;

    (4) comparing each of the decoding results in the decoding vector with a threshold to update a corresponding counter with respect to one of the first cells in a two-dimensional counter vector;

    (5) repeatedly performing the steps (2)-(4) for a predetermined iteration if any of the corresponding counters exceeds a limit value;

    (6) determining whether the steps (2)-(4) have been performed for all of the plurality of cells;

    (7) filtering the plurality of counters to generate filtered results;

    (8) finding a most likely cell having a maximum value among the filtered results; and

    (9) setting the most likely cell to be the target cell for acquisition of the GPS signal.

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