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Method for determining the position of a portable user device around a vehicle and associated location device

  • US 10,136,256 B2
  • Filed: 03/15/2017
  • Issued: 11/20/2018
  • Est. Priority Date: 03/16/2016
  • Status: Active Grant
First Claim
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1. Method of determining the position of a portable user device (SD′

  • ) around a vehicle (V) using a location device (10

    ) on board said vehicle (V) and communicating with the portable device (SD′

    ) by radio waves, said portable device (SD′

    ) being equipped with an electronic circuit for measuring the received signal strength, and with an accelerometer or internal clock (M20) for acceleration measurement, wherein whenever the portable device (SD′

    ) receives a signal from the location device (10

    ), the method comprises;

    Measuring and storing a value of strength of the signal (RSSI(t)) thus received,Measuring and storing a value of acceleration (AC(t)) of the portable device (SD′

    ),Calculating a ratio (R) between a variation of the strength value thus measured, relative to a strength value stored at a preceding instant (RSSI(t−

    1)-RSSI(t)), and a variation of the acceleration value thus measured, relative to an acceleration value stored at said preceding instant (AC(t−

    1)-AC(t)),Comparing the ratio (R) thus calculated with at least one predetermined threshold (S1, S2), in order to determine a distance (D) between the portable device and the vehicle.

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