Patent ID: 6966491

Claim:
A system for detecting the passage of a person or an object through an entry-exit of a delimited space, the system comprising: a detection device associated with said delimited space and comprising transmission means for transmitting first and second electromagnetic signals in respective spatially separate and partially overlapping first and second communication regions each crossing an entry-exit zone defined by said entry-exit; a portable electronic unit adapted to equip said person or object and comprising receiver means for receiving said first and second electromagnetic signals transmitted by said transmission means; and means for detecting the direction of passage through said entry-exit of a person or an object equipped with a portable electronic unit as a function of the reception of said first and second electromagnetic signals, wherein said first and second electromagnetic signals are transmitted substantially in phase at the same frequency and each comprises an identical message portion, one of said first and second electromagnetic signals further comprising an additional message portion identifying the corresponding communication region, transmission of the other of said first and second electromagnetic signals being interrupted during the transmission of said additional message portion.