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PASSIVE ENTRY SYSTEM AND METHOD FOR A VEHICLE

  • US 20110148573A1
  • Filed: 12/22/2009
  • Published: 06/23/2011
  • Est. Priority Date: 12/22/2009
  • Status: Active Grant
First Claim
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1. A method for determining the location of a remote transmitter positioned about a vehicle, the method comprising:

  • transmitting a measuring signal from a first antenna located about the vehicle to a remote transmitter;

    receiving an acknowledgement signal from the remote transmitter in response to the measuring signal, wherein the acknowledgement signal includes a first received signal strength indication (RSSI) value for the first measuring signal, and the first RSSI value is a function of the amplitude of the first measuring signal as received by the remote transmitter;

    establishing at least one authorization zone based upon the geometrical shape of the signal radiated from the first antenna, wherein the authorization zone is established using at least one corresponding set of predetermined RSSI value ranges correlating to the first measuring signal; and

    determining whether the remote transmitter is in the at least one authorization zone by comparing whether the first RSSI value is within at least one of the RSSI value ranges.

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