Patent ID: 6915122
Filing Date: 2005-07-05
Classification: H01Q

Abstract:
1. A method for calibrating a hands-free access system comprising an authentication and control unit mounted in a vehicle with at least one antenna that emits an electromagnetic field and an antenna controller, and a portable identification member capable of communicating from a distance with the authentication and control unit to be authenticated, which method consists in the following steps: A. sending to the authentication and control unit, from a measurement and control apparatus equipped with an antenna for receiving an electromagnetic field, connected to the authentication and control unit via wire link, a message to configure the authentication and control unit in a calibration mode, B. on receipt of the message, generating a signal and transmitting it from the authentication and control unit via said emitting and receiving antennas to said measurement and control apparatus, C. measuring electromagnetic and spectral characteristics of said signal received on the receiving antenna in the measurement and control apparatus, comparing them with reference values and sending calibration data to the authentication and control unit via the wire link if the measured characteristics do not correspond to the reference values, D. on receipt of the calibration data by the authentication and control unit, modifying the operating parameters of the antenna controller.