System for detecting individuals or objects passing through an entrance-exit of a defined space

System for detecting the passage of persons or objects through an entry-exit (4) to a delimited space (2), including:

• a detection device associated with said delimited space (2) and including transmission means (8) for transmitting different first and second electromagnetic signals (a, b) in respectively first and second communication regions (A, B) spatially separated from each other and partially overlapping, these first and second regions (A, B) each covering an entry-exit zone (32) defined by said entry-exit (4);
• portable electronic units (40) intended to be fitted to said persons or objects and including reception means (41, 42;
• 41, 42a, 42b) for said first and second electromagnetic signals (a, b) transmitted by said transmission means (8);
• and
• means for detecting the direction of passage, through said entry-exit (4, 5), of a person or an object fitted with one of said portable electronic units (40) as a function of the reception of said first and second electromagnetic signals,
• characterised in that each portable electronic unit includes:
• amplitude measuring means for determining the reception amplitude (RSSI;
• RSSI_a, RSSI_b), by said portable electronic unit, of said first and second electromagnetic signals (a, b);
• and
• comparator means (47) for comparing the reception amplitude of said first electromagnetic signal (a) with the reception amplitude of said second electromagnetic signal (b) so as to determine which of these two signals has the highest amplitude.