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Continuous integration based satellite navigational signal acquisition

  • US 7,180,446 B2
  • Filed: 07/12/2005
  • Issued: 02/20/2007
  • Est. Priority Date: 07/12/2005
  • Status: Expired due to Fees
First Claim
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1. A method implemented in a global satellite navigation receiver for acquisition of signals received from navigational satellites, the method comprising:

  • in a coarse acquisition phase;

    for a selected dwell in a list of code-frequency dwells, calculating a non-coherent accumulated power from the signals,if the non-coherent accumulated power is less than a low threshold value then eliminating the selected dwell from the list of code-frequency dwells and continuing the coarse acquisition phase,if the non-coherent accumulated power is greater than a high threshold then initiating a fine acquisition phase using the selected dwell;

    if a number of integration intervals for the selected dwell exceeds a predetermined duration then initiating the fine acquisition phase using the list of code-frequency dwellsin the fine acquisition phase;

    for a given dwell, calculating a fast Fourier transform of a set of recent signal samples to determine coherent accumulated powers for a set of frequencies, anddiscarding frequencies whose coherent accumulated powers are less than an average power.

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