POSITIONING SYSTEM
First Claim
1. A method of managing a database of positioning data, the positioning data including electromagnetic signal source data for use by a positioning system, and the method comprising:
- receiving signal data relating to signals received by user devices from a plurality of electromagnetic signal sources;
associating each of the electromagnetic signal sources with an appropriate geographical region selected from a plurality of geographical regions;
selecting a subset of the plurality of electromagnetic signal sources in dependence on their associated geographical regions;
processing the signal data relating to the subset of the plurality of electromagnetic signal sources to compute position estimates of the electromagnetic signal sources; and
updating the database of electromagnetic signal source data in dependence on the computed position estimates.
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Accused Products
Abstract
There is disclosed a method of managing a database of positioning data, the positioning data including electromagnetic signal source data for use by a positioning system, and the method comprising: receiving signal data relating to signals received from a plurality of electromagnetic signal sources; associating an appropriate one of a plurality of zone identifiers with each of the electromagnetic signal sources, each zone identifier being associated with a respective geographical zone; selecting a subset of the plurality of electromagnetic signal sources in dependence on their associated zone identifiers; processing the signal data relating to the subset of the plurality of electromagnetic signal sources to compute position estimates of the electromagnetic signal sources; and updating the database of electromagnetic signal source data in dependence on the computed position estimates.
38 Citations
34 Claims
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1. A method of managing a database of positioning data, the positioning data including electromagnetic signal source data for use by a positioning system, and the method comprising:
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receiving signal data relating to signals received by user devices from a plurality of electromagnetic signal sources; associating each of the electromagnetic signal sources with an appropriate geographical region selected from a plurality of geographical regions; selecting a subset of the plurality of electromagnetic signal sources in dependence on their associated geographical regions; processing the signal data relating to the subset of the plurality of electromagnetic signal sources to compute position estimates of the electromagnetic signal sources; and updating the database of electromagnetic signal source data in dependence on the computed position estimates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 29, 30, 31, 32)
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12. A method of managing a database of positioning data, the positioning data including electromagnetic signal source data for use by a positioning system, and the method comprising:
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receiving signal data relating to signals received from a plurality of electromagnetic signal sources; associating an appropriate one of a plurality of zone codes with each of the electromagnetic signal sources, each zone code being associated with a respective geographical zone, and wherein the zone codes comprise a first zone code associated with a subset of signal sources having substantially the highest level of accuracy of position estimation, and a second zone code associated with zones of signal sources whose position estimates depend on position estimates associated with electromagnetic signal source associated with the first zone code; processing the signal data to compute position estimates of the electromagnetic signal sources; and updating the database of electromagnetic signal source data in dependence on the computed position estimates. - View Dependent Claims (22, 23, 24)
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25. A method of improving the estimation of the position of a device, the device being operable to use a positioning system that generates position estimates in dependence on positioning data relating to emissions from electromagnetic signal sources, and the method comprising:
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using the positioning system to generate an initial estimate of the position of the device; detecting at least one emission from a respective at least one electromagnetic signal source; estimating the position of said at least one electromagnetic signal source in dependence on said initial estimate of the position of the device; updating the positioning data in dependence on the estimated position of said at least one electromagnetic signal source; using the positioning system to generate a further estimate of the position of the device; and outputting the further estimate of the position of the device. - View Dependent Claims (26, 27, 28)
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33. (canceled)
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34. (canceled)
Specification