Telecommunications – Transmitter and receiver at separate stations – Near field
Reissue Patent
2007-11-29
2010-10-19
Milord, Marceau (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Near field
C455S011100, C455S013300, C455S101000, C455S562100, C455S069000, C455S067160, C455S522000, C455S345000, C455S343500, C340S539100, C340S539130, C340S010410, C340S005720, C340S010400, C340S007330, C340S010200, C333S001100, C333S024200, C324S318000, C324S326000, C324S207170, C324S247000, C343S823000, C343S823000, C343S823000, C343S841000, C343S703000
Reissue Patent
active
RE041843
ABSTRACT:
A method detects relaying of a contactless data communication by a radio amplifier for intercepting and manipulating the communication to achieve an unauthorized authentication. The method involves transmitting an electromagnetic field successively from at least two spatially separated antennas of a transmitting unit, receiving the transmitted fields in a receiving unit, determining field strength vectors of the received fields allocated to each antenna, and comparing actual values of the vectors with prescribed nominal values stored in a nominal value field that maps the true field strength distribution in multi-dimensional space around the transmitting unit. The actual field strength magnitude and the reception angle between the transmitting antennas can be determined from the vectors and compared with stored nominal values in this manner. When the determined actual values match prescribed nominal values of the nominal value field, the occurrence of a relaying of the signal can be reliably excluded.
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Blatz Werner
Moser Helmut
Atmel Automotive GmbH
Milord Marceau
Muncy Geissler Olds & Lowe, PLLC
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