Method and apparatus for mitigating multipath effects at a satellite signal receiver using a sequential estimation filter
AssigneeGlobal Locate, Inc.
InventorsFrank van Diggelen, Charles Abraham, Sergei Podshivalov
Life of this patent
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Abstract
A method and apparatus for mitigating multipath effects in a satellite signal receiver is described. In one example, measured pseudoranges are obtained from the satellite signal receiver to a plurality of satellites. For each measured pseudorange: an expected pseudorange is derived from a sequential estimation filter in the satellite signal receiver. The measured pseudorange and the expected pseudorange are differenced to compute a pseudorange residual. The measured pseudorange is applied to the sequential estimation filter only if the pseudorange residual is within a window.
Claims16
A method of mitigating multipath effects in a satellite signal receiver, comprising:
- obtaining measured pseudoranges from the satellite signal receiver to a plurality of satellites;
- and
- for each measured pseudorange of the measured pseudoranges:
- deriving an expected pseudorange from a sequential estimation filter in the satellite signal receiver;
- differencing the measured pseudorange and the expected pseudorange associated therewith to compute a pseudorange residual;
- and
- applying the measured pseudorange to the sequential estimation filter only if the pseudorange residual is within a window.
A mobile device, comprising:
- a satellite signal receiver for processing signals from a plurality of satellites to obtain measured pseudoranges;
- and
- a sequential estimation filter configured to sequentially process each measured pseudorange of the measured pseudoranges by deriving an expected pseudorange, differencing the measured pseudorange and the expected pseudorange to compute a pseudorange residual, and updating a state vector only if the pseudorange residual is within a window.
Dependencies are inferred from the claim text.