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专利名称：Passive response communication system发明人：Eric Perraud,Michel Burri申请号：US10228518申请日：20020827
公开号：US20030043023A1公开日：20030306
专利附图：
摘要：A method of passive response communication, especially for an access controlsystem, in which a first transponder () transmits an interrogation signal to a remotesecond transponder (), which responds by transmitting data back to the first transponder(), the two transponders each comprising a transmitter and a receiver, and a
communication signal exchanged between said transponders () in at least one directionincluding a plurality of anti-relay-attack pulses (). At least one distinguishing pulse ()selected among the anti-relay-attack pulses has a distinctive shape and the receiver ofsaid communication signal is selectively responsive to the shapes of said plurality ofpulses (). Interception of the transmitted signal in a relay attack using digital transceiverswill not relay the distinctive shape and the response of the second transponder isinhibited.
申请人：PERRAUD ERIC,BURRI MICHEL
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