公开(公告)号：US20170272907A1

公开(公告)日：2017-09-21

申请号：US15459904

申请日：2017-03-15

Applicant: CONTINENTAL AUTOMOTIVE FRANCE ,  CONTINENTAL AUTOMOTIVE GmbH

Inventor： Sylvain GODET ,  Frederic MERLET

IPC: H04W4/02 ,  G01S5/02 ,  H04B17/318

CPC classification number: H04W4/023 ,  E05B77/48 ,  G01S5/0252 ,  G01S5/0263 ,  G01S11/06 ,  G01S13/825 ,  G07C9/00174 ,  G07C9/00309 ,  G07C2209/63 ,  H04B17/318 ,  H04W4/027

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.