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Methods and systems for acquiring signals using coherent match filtering

  • US 7,907,679 B2
  • Filed: 01/12/2007
  • Issued: 03/15/2011
  • Est. Priority Date: 01/12/2007
  • Status: Active Grant
First Claim
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1. A method for verifying a detection of a correlation peak representing an acquisition of a received acquisition code symbol sequence, the method comprising:

  • receiving the acquisition code symbol sequence, wherein the acquisition code symbol sequence includes a plurality of acquisition code symbols, and wherein an acquisition code symbol includes a subcode sequence having a plurality of subcodes;

    performing a correlation of the plurality of subcodes to produce a plurality of correlation peaks;

    correcting each peak of the plurality of correlation peaks in frequency, phase, and time to produce a plurality of coherently-aligned peaks;

    performing a coherent match filter process on the plurality of coherently-aligned peaks to produce a match filter result;

    verifying the detection of the correlation peak when the match filter result exceeds a first threshold; and

    further verifying the detection of the correlation peak by performing a non-linear process on the plurality of coherently-aligned peaks.

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