Patent ID: 11899091
Assignee: CONTINENTAL AUTOMOTIVE GMBH
Field: Measurement (Instruments)
Classification: CPC G  B  H | IPC B  G  H

Claim 7:
8. A communication module for a vehicle, said communication module being capable of communicating with a device for authenticating a user of said vehicle over a wireless communication link, each communication module comprising an electronic clock that defines the sampling frequency of the signals received from the device, the communication module being configured so as to:
transmit, over the wireless communication link, a request signal destined for the device at a first instant,
receive, over the wireless communication link, a response signal sent by the device following the reception, by said device, of the transmitted request signal,
add noise to the received response signal,
sample the noisy response signal,
detect, at a second instant, the noisy response signal when the amplitude of said noisy response signal exceeds a predetermined detection threshold, and
send the value of the second detected instant to a computer so that said computer estimates the distance between the vehicle and the device.