System framework for mobile device location
US7994981B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2010 |
| Grant date | Aug 9, 2011 |
| Priority date | — |
| Expiry date | Sep 7, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for estimating the location of a beacon from an ensemble of measurements associated with said beacon, where, contained in each measurement, are GPS data from which surfaces of location may be extracted, together with the ID's of beacons detectable at the point of measurement, is disclosed. The method comprises extracting the canonical set of surfaces of location implicit in each of the associated measurements, and determining the estimate of the location of the beacon as the point for which the sum of the squares of the distances to each of the surfaces so extracted is minimized. A system for the compilation of a database of beacon locations from measurements containing a time-stamped recording of the composite GPS signal (which recording is referred to as a datagram), together with the ID's and associated signal strengths of beacons detectable at the point of measurement, is also disclosed. The system comprises GPS signal processing means for extracting, from each time-stamped datagram, the canonic set of surfaces of location, and beacon location estimation means for estimating the location of a beacon from an ensemble of surfaces of location associated with said beacon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.