The detailed description of the invention is given with reference to the figures which represent:
a, 4b and 4c: timing diagrams respectively of the request signals transmitted by a unit on board the vehicle, of the measurement performed by the identifying device of the intensity of the ambient radio frequency field in the frequency domain of the request signals, of the presence and/or locking signals transmitted by the identifying device, when the measured field is less than a predetermined threshold level.
a, 5b and 5c: timing diagrams respectively of the request signals transmitted by a unit on board the vehicle, of the measurements performed by the identifying device of the intensity of the ambient radio frequency field in the frequency domain of the request signals, of the presence and/or locking signals transmitted by the identifying device, when the measured field is temporarily greater than a predetermined threshold level.
Number | Date | Country | Kind |
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0601495 | Feb 2006 | FR | national |