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Weak signal acquisition

  • US 20070085736A1
  • Filed: 05/23/2006
  • Published: 04/19/2007
  • Est. Priority Date: 10/14/2005
  • Status: Active Grant
First Claim
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1. A method of acquisition of a weak satellite signal from a satellite, in the presence of an interfering strong satellite signal from another satellite in a global positioning system receiver, comprising the steps of:

  • identifying said strong interfering satellite signal that causes cross-correlation;

    determining the millisecond boundary correlation histogram for said incoming strong interfering satellite signal, wherein the millisecond boundary correlation histogram is derived by determining and integrating correlation values starting from different millisecond boundaries for a navigation data bit;

    correlating and integrating the locally generated code representing said weak satellite signal with the incoming signal at different chip delays for an extended period of time, thereby identifying the chip delays at which the correlation peaks occur;

    generating millisecond boundary correlation histograms for navigation data bit at each of said identified chip delays at which correlation peaks occur; and

    identifying the unique histogram amongst the multiple correlation histograms.

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