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.

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.