Methods and systems for stationary user detection in a hybrid positioning system
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United States of America Patent
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Jan 3, 2012
Grant Date -
Dec 10, 2009
app pub date -
Jun 5, 2009
filing date -
Jun 6, 2008
priority date (Note) -
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Abstract
This disclosure describes methods and systems for stationary user detection in a hybrid location system. In some embodiments, the method for determining whether a satellite enabled device is stationary by measuring the Doppler frequency of received satellite signals can include acquiring satellite measurements from at least two satellites, wherein the satellite measurements include Doppler frequency measurements, acquiring a rough estimate of location of the satellite enabled device and calculating an internal frequency offset of satellite enabled device.
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