Method for determining the position of a portable user device around a vehicle and associated location device
US10136256B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 15, 2017 |
| Grant date | Nov 20, 2018 |
| Priority date | — |
| Expiry date | Mar 15, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2209/63
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a method of determining the position of a portable user device around a vehicle by a location device placed on board the vehicle and communicating with the portable device by radio waves, including the execution of the following steps whenever the portable device receives a signal from the location device: step E3: Measuring and storing a value of strength of the signal) thus received; step E4: Measuring and storing a value of acceleration) of the portable device; step E5: Calculating a ratio between a variation of the strength value thus measured, relative to a strength value stored at a preceding instant-RSSI, and a variation of the acceleration value thus measured, relative to an acceleration value stored at the preceding instant-AC; step E6: Comparing the ratio thus calculated with at least one predetermined threshold, in order to determine a distance between the portable device and the vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.