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US 6,618,670 B1Granted
Resolving time ambiguity in GPS using over-determined navigation solution
AssigneeSiRF Technology, Inc.
InventorMangesh M. Chansarkar
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Abstract
The invention describes methods and apparatuses for determining a user position based on a minimization of the errors introduced into the GPS system because of clock bias, noise, multipath, or other uncertainties. By overdetermining position, for example, clock biases can be removed from the system.
Claims4
A method for resolving a variable ambiguity in a global positioning system receiver, comprising:
- determining a plurality of pseudoranges to a plurality of Global Positioning System satellites;
- an error range for each of the pseudoranges, wherein the error range gives a maximum and a minimum for each of the pseudoranges;
- and
- minimizing a distance from a predetermined estimate of user position to the maximum and minimum for the plurality of pseudoranges.
1 more element
Dependencies are inferred from the claim text.