Patent ID: 9639557
Date: 2017-05-02
CPC Classifications: G01S,G06F,H04W

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, wherein each electromagnetic signal source has a zone code assigned to it, a first zone code being associated with a subset of signal sources having substantially the highest level of accuracy of position estimation, a second zone code being associated with zones of signal sources whose position estimates depend on position estimates associated with a zone of the first zone code.