Method of determining position in a hybrid positioning system using a dilution of precision metric
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United States of America Patent
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Oct 2, 2012
Grant Date -
Apr 7, 2011
app pub date -
Oct 2, 2009
filing date -
Oct 2, 2009
priority date (Note) -
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Abstract
The disclosed subject matter relates to a method for determining the position of a device in a hybrid positioning system. The method includes determining an initial position estimate of a device using a non-satellite positioning system, obtaining satellite measurements from less than four satellites, wherein the measurements include each satellite's position with respect to the initial position estimate, determining a dilution of precision (DOP) based on the satellite measurements, if the DOP is small, refining the initial position estimate using the satellite measurements, and if the DOP is large, providing the initial estimate as a final position estimate for the device. In some embodiments, the non-satellite positioning system is a WLAN positioning system. In some embodiments, the method includes obtaining satellite measurements from two satellites or three satellites.
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