GLOBAL POSITIONING SYSTEM USING BROADBAND NOISE REDUCTION
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United States of America Patent
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Issued Date -
Sep 4, 2008
app pub date -
Aug 16, 2007
filing date -
Aug 17, 2006
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Abandoned
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Abstract
The present invention is directed to a global positioning system (GPS) having improved signal-to-noise ratio for reducing the required signal level for which GPS may be implemented in electronic devices or cell phones. The acquisition function of the GPS receiver is improved by inserting new signal processing for broadband noise reduction that allows subsequent improved estimation of critical time shift and frequency shift parameters needed for GPS acquisition at lower received signal levels. The decoding of the navigation bits from the satellite transmissions is improved to provide ephemeris data needed for computing navigation solutions at lower received signal levels, by examining the output of the same new signal processing for broadband noise reduction for spikes in the power of the output time series that correspond to navigation bit flips.
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