Method for determining the position of a portable user device around a vehicle and associated location device
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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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.
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Citations
15 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- ) around a vehicle (V) using a location device (10′
-
9. A location device (10′
- ) for locating a portable user device (SD′
) around a vehicle (V), said device (10′
) being on board the vehicle (V), and communicating with the portable device (SD′
) by radio waves, said device (10′
) comprising one or more antennas and electronic circuits configured for receiving a signal strength value sent by the portable device (SD′
) and configured for receiving an acceleration value (AC(t)) sent by the portable device (SD′
), said device (10′
) further comprising;
•
one or more microcontrollers configured for storing the strength values (RSSI(t)) and acceleration values (AC(t)) thus received, configured for 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)), and configured for 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 (SD′
) and the vehicle (V), anda clock (H1). - View Dependent Claims (10, 11, 12, 13, 14)
- ) for locating a portable user device (SD′
-
15. Portable user device (SD′
- ), communicating by radio waves with a location device (10′
) on board a motor vehicle (V), the portable device being designed to be located around the vehicle (V) by said location device (10′
), said portable device (SD′
) comprising;one or more antennas and electronic circuits configured for measuring a received radio signal strength value (RSSI(t)) of a signal sent by the location device (10′
), configured for measuring a value of acceleration (AC(t)) of said portable device (SD′
),one or more microcontrollers configured for storing the strength values (RSSI(t)) and acceleration values (AC(t)) thus measured, configured for 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)), and configured for 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 (SD′
) and the vehicle (V), and a clock (H2).
- ), communicating by radio waves with a location device (10′
Specification
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Current AssigneeContinental Automotive France (Continental AG), Continental Automotive GmbH (Continental AG)
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Original AssigneeContinental Automotive France (Continental AG), Continental Automotive GmbH (Continental AG)
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InventorsGodet, Sylvain, Merlet, Frederic
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Primary Examiner(s)Arevalo, Joseph
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Application NumberUS15/459,904Publication NumberTime in Patent Office615 DaysField of Search455418, 4554563, 4554564, 455573US Class CurrentCPC Class CodesE05B 77/48 by electrical meansG01S 11/06 using intensity measurementsG01S 13/825 with exchange of informatio...G01S 5/0252 Radio frequency fingerprintingG01S 5/0264 at least one of the systems...G07C 2209/63 Comprising locating means f...G07C 9/00174 Electronically operated loc...G07C 9/00309 operated with bidirectional...H04B 17/318 Received signal strengthH04W 4/023 using mutual or relative lo...H04W 4/027 using movement velocity, ac...
