Title：Relay attack defense method and system based on pulse flight time ranging
Country：China
Patent No.：201910093208.5
Legal Status：Authorized
Inventor：Woogeun Rhee, Haixin Song, Zhihua Wang
Assignee：Tsinghua University
Address：Tsinghua University,Haidian District Beijing 100084, China
Filing Date：2019-01-30
Issue Date：2021-05-28
Abstract：
The invention discloses a relay attack defense method and system based on pulse flight time ranging, wherein the method includes the steps of synchronizing a verification node and a certification nodein advance; allowing the verification node to emit a pulse with a challenge bit Ci subjected to pulse position modulation; allowing the verification node to receive a first pulse, detecting an envelope rising edge of the first pulse, and demodulating to obtain data Ci; allowing the certification node to calculate a response bit Ri based on the challenge bit Ci; allowing the certification node todelay based on the envelope rising edge of the first pulse to obtain an emitted pulse trigger signal, and transmitting a pulse with the response bit Ri subjected to pulse position modulation; allowingthe verification node to receive a second pulse, detecting an envelope rising edge of the second pulse, demodulating to obtain data Ri, and measuring signal flight time; allowing the verification node to verify the position of the certification node and correctness of the response bit Ri. The method herein helps reduce signal transceiving delay of the certification node, provides high ranging precision, and helps effectively decrease the relay attack chances.
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