Patent ID: 9609617
Date: 2017-03-28
CPC Classifications: G01S,H04W

Claim:
1. A method of estimating the location of a plurality of electromagnetic signal sources, comprising: scanning at a first plurality of locations to generate signal source position data, the signal sources being wireless access points, radio transmitters and/or wireless beacons, the signal source position data representing estimates of the position of one or more said signal sources; scanning at a second plurality of locations using a signal detection system to generate signal detection data, the signal detection data relating to signals received at the second plurality of locations from the signal sources; at least part of the scanning being carried out using a vehicle-mounted device, a mobile phone or other hand-held portable device; processing the signal source position data in dependence on the signal detection data to correct estimation errors in the signal source position data; and outputting the processed signal source position data; storing the processed signal source position data; receiving a user location request from a user device, the user location request including data obtained from a signal detection system associated with the user device; processing the stored signal source position data in dependence on the user location request data to generate user location data representing an estimate of the location of the user device; and outputting the user location data.