Hybrid method for high accuracy and cost-effective prediction of mobile device positions through mobile networks
View Patent ↗A method for determining the geographical location of a network-connected mobile device comprising a hybrid approach that further comprises both the utilization of strength or time delay signals and a database of fingerprints taken throughout the network area.
1. A system for determining the location of a mobile device in communication with one or more radio transmitters at known locations comprising:
a mobile communications network;
a plurality of network transceivers; and
a location server;
wherein the mobile communications network is in communication with a mobile device via the plurality of network transceivers;
wherein the location server receives and responds to requests for location-based data pertaining to the mobile device;
wherein the location server computes an initial estimate of a location of the mobile device using cell tower triangulation and calculates a plurality of expected reception profiles at each point in a geographic grid comprising points in a neighborhood of the initial estimated location by combining, for each geographic grid point, predicted reception at the geographic grid point with actual reception data obtained from stored radio frequency fingerprint data for a plurality of locations near the geographic grid point, the available stored radio frequency fingerprint data for each nearby location weighted based at least on a distance from the geographic grid point to a the respective nearby location;
wherein predicted reception for each geographic grid point is based at least on a terrain type through which a signal must travel to arrive at the grid point from each network transceiver for which reception is being predicted and on network specific data;
wherein actual reception characteristics for the mobile device are compared to the plurality of expected reception profiles for points in the geographic grid in order to determine a closest match using an error function and thereby to accurately determine a location of the mobile device.
2. The system of claim 1 , further comprising:
a data storage system;
wherein the location server is connected to the data storage system.
3. The system of claim 2 , wherein the location server stores previous location data in the data storage system.
4. The system of claim 3 , wherein the location server compares stored location data to current network conditions to find a match.
5. The system of claim 4 , wherein the location server operates within the mobile communications network.
6. The system of claim 4 , wherein the location server operates within the mobile device.