METHOD FOR DETECTING THE EVENTUAL PRESENCE OF AN OBJECT BY A CONTACTLESS READER, AND CORRESPONDING READER

摘要

Method for detecting the possible presence of an object by a reader capable of communicating with each other by at least one contactless communication protocol, comprising a detection phase comprising a transmission by an antenna of the reader of a magnetic field on a carrier signal having a subcarrier modulated by a first data sequence (SQ1), said modulation (101) being at least uninterpretable by said object, receiving at the reader antenna a signal resulting from said transmission, a demodulating (200) in the subcarrier reader of said resultant signal to extract a second data sequence (SQ2), a correlation (30) between the two data sequences and a detection of the possible presence or absence of said object as a function of the result of the correlation.