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System and method for GPS signal acquisition

  • US 7,782,252 B2
  • Filed: 12/13/2007
  • Issued: 08/24/2010
  • Est. Priority Date: 06/02/2007
  • Status: Active Grant
First Claim
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1. A method for acquiring a GPS signal having a predefined coarse acquisition frame period, the method comprising:

  • receiving a GPS signal portion over the coarse acquisition (C/A) frame period;

    storing the received GPS signal portion;

    correlating the received GPS signal portion to each of a plurality of versions of a reference coarse acquisition (C/A) code to obtain a respective plurality of autocorrelation values; and

    selecting a peak value among the autocorrelation values,wherein correlating the received GPS signal portion comprises;

    (i) correlating the received GPS signal portion to a reference coarse acquisition code to obtain a first autocorrelation value;

    (ii) circularly-shifting the reference coarse acquisition code to obtain a shifted reference coarse acquisition code;

    (iii) correlating the received GPS signal portion to the circularly-shifted reference coarse acquisition code to obtain a second autocorrelation value andrepeating (ii) and (iii) until the reference C/A code has shifted through one complete revolution, whereby the received GPS signal portion is correlated to each of the reference and shifted versions of the C/A code.

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