METHOD AND SYSTEM FOR DETECTING RELAY ATTACK FOR PASE SYSTEM

摘要

A passive entry system for a passenger car comprises a low frequency transceiver for transmitting a low frequency signal, an ultra-wideband transceiver and an evaluation unit. The evaluation unit comprises a computation unit for deriving a first distance measure of a key fob, which is encoded in a first received ultra-wideband signal and which is derived from a signal strength of the low frequency signal, for de- riving a second distance measure of the key fob from a time of arrival of a second received ultra-wideband signal, for comparing the first distance measure with the second distance measure and for determining a distance mismatch between the second distance measure and the second distance measure.