METHOD FOR AUTOMATICALLY DETECTING A USER IDENTIFICATION DEVICE ASSOCIATED WITH A VEHICLE, USER IDENTIFICATION UNIT, COMPUTER PROGRAM PRODUCT AND COMPUTER-READABLE MEDIUM

摘要

The invention relates to a method for automatically detecting a user identification device (16) associated with a vehicle (1), wherein a user identification unit (2) of the vehicle (1) has at least one transmitting antenna (4, 6, 8, 10), at least one receiving antenna (12) and a controller (14), and the controller (14) controls the at least one transmitting antenna (4, 6, 8, 10) to emit in each case at least one query signal to the user identification device (16), evaluates whether the response signal received from the user identification device (16) correlates with the at least one query signal and controls a vehicle component of the vehicle (1) in accordance with this evaluation. In order to improve a defense against a relay attack on a vehicle (1) that can be operated by means of a user identification device (16), according to the invention, in the control of the at least one transmitting antenna (4, 6, 8, 10), a supply of current to the at least one transmitting antenna (4, 6, 8, 10) is varied in order to emit the at least one query signal. The invention further relates to a user identification unit, to a computer program product and to a computer-readable medium.