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System for controlling right of access to a vehicle

  • US 20030156068A1
  • Filed: 04/15/2003
  • Published: 08/21/2003
  • Est. Priority Date: 04/11/2000
  • Status: Active Grant
First Claim
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1. A system for verifying the access authorization to a vehicle having a vehicle-based transceiver unit (E) which has at least two transmitting/receiving antennas spaced a distance apart in or on the vehicle, and having a transponder unit (T) which is set up for detection of its presence and for exchanging a predetermined identification request/response sequence through or with the transceiver unit (E) within a predetermined detection area in or around the vehicle (F), wherein the transceiver unit (E) has calculation/analyzing means which perform the detection of a position of the transponder unit (T) by using a time and/or phase measurement based on a mathematical geometric method in response to a reply signal transmitted by the transponder and received by the at least two transmitting/receiving antennas in response to the identification request.

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