Importance

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Abstract

A method for characterizing, by way of at least one primary antenna (13, 31) on board a motor vehicle (10), a mobile device (20) of indeterminate type comprising a secondary antenna (21) of indeterminate size, approaching said motor vehicle (10) in an indeterminate approach mode, said primary antenna (13, 31) being intended to communicate with the secondary antenna (21) of the mobile device (20), and generating a voltage (V) across its terminals, the voltage being linked to an on-board system (11) of the motor vehicle (10), the invention proposes that the method of characterization comprises the following steps:

step 1: measurement by the on-board system (11) of the voltage across the terminals of the primary antenna (13, 31), over a series of predetermined time periods,step 2: computation of a voltage difference for each predetermined time period,step 3: comparison of the voltage difference with a value previously stored in the memory,step 4: if the voltage difference is positive, then the mobile device (20) is of dielectric type, otherwise if it is negative, it is of metallic type,step 5: if the voltage difference is zero over a predetermined time period above a threshold, then the mobile device (20) is in static approach mode, otherwise it is in dynamic approach mode.

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First Claim