METHOD OF DETERMINING POSITION IN A HYBRID POSITIONING SYSTEM USING A DILUTION OF PRECISION METRIC
First Claim
1. A method for determining position of a device in a hybrid positioning system, the method comprising:
- 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.
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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.
191 Citations
23 Claims
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1. A method for determining position of a device in a hybrid positioning system, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for determining position of a device in a hybrid positioning system, the method comprising:
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determining an initial position estimate of a device using a non-satellite positioning system; obtaining satellite measurements from three satellites, wherein the measurements include each satellite'"'"'s position with respect to the initial position estimate; grouping the three satellites into three groups of two satellites; determining an angle between each of the two satellites with respect to the initial position determination for each group; and selecting two or more satellites from the group of three satellites based on the angles measured, wherein satellites having large angles between them are selected and satellites having small angles in between them are not selected. - View Dependent Claims (18, 19, 20, 21)
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22. A method for determining position of a device in a hybrid positioning system, the method comprising:
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determining an initial position estimate of a device using a non-satellite positioning system; obtaining satellite measurements from three satellites, wherein the measurements include each satellite'"'"'s position with respect to the initial position estimate; grouping the three satellites into three groups of two satellites; determining an angle between each of the two satellites with respect to the initial position determination for each group, wherein the angle is the DOP for each group; determining three intermediate positions for the device using each group of two satellites; weighting the three intermediate positions for the device using the DOP for each group of two satellites; and determining a final position of the device by averaging the weighted intermediated positions. - View Dependent Claims (23)
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Specification