Patent ID: 6803882
Filing Date: 2004-10-12
Classification: B60R,G07C

Abstract:
A system for verifying an access authorization to a vehicle, comprising:a vehicle-based transceiver unit including at least two transmitting/receiving antennas spaced a distance apart one of in the vehicle and on the vehicle; and a transponder unit for detecting a presence of the transceiver unit and for exchanging a predetermined identification request/response sequence one of through and with the transceiver unit within a predetermined detection area one of in and around the vehicle, wherein: the transceiver unit includes a calculation/analyzing device that detects a position of the transponder unit by using at least one of a time measurement and a phase measurement based on a mathematical geometric operation in response to a reply signal transmitted by the transponder unit and received by the at least two transmitting/receiving antennas in response to an identification request.