Patent ID: 7026924
Filing Date: 2006-04-11
Classification: G06K,G07B,G07C

Abstract:
1. A system for detecting the passage of persons or objects through an entry-exit to a delimited space, including: a detection device associated with said delimited space and including transmission means for transmitting different first and second electromagnetic signals in respectively first and second communication regions spatially separated from each other and partially overlapping, these first and second regions each covering an entry-exit zone defined by said entry-exit; portable electronic units intended to be fitted to said persons or objects and including reception means for said first and second electromagnetic signals transmitted by said transmission means; and detecting means for detecting the direction of passage, through said entry-exit, of a person or an object fitted with one of said portable electronic units as a function of the reception of said first and second electromagnetic signals, wherein each portable electronic unit includes: amplitude measuring means for determining the reception amplitude, by said portable electronic unit, of said first and second electromagnetic signals; and comparator means for comparing the reception amplitude of said first electromagnetic signal with the reception amplitude of said second electromagnetic signal so as to determine which of these two signals has the highest amplitude, the signal with the highest amplitude being used by said detecting means to determine the time succession of reception of said first and second electromagnetic signals.