Passive entry / passive start system implementing music algorithm based on arrival angle determination of received signal via circularly polarized wave antenna

摘要

A vehicle access system is provided and includes an antenna and an access module.The antenna is configured to receive signals transmitted from the portable access device to the vehicle respectively.One antenna is a circularly polarized antenna.The access module downconverts the received signal, generates the same phase and quadrature phase signals, executes the music algorithm to determine the angle of arrival of the received signal received by the antenna, determines the distance between the portable access device and the vehicle based on the angle of arrival and It is configured to permit access to the vehicle based on the distance.