Locating system and method employing radio frequency tags

G - Physics – 08 – B

Patent

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Details

G08B 13/14 (2006.01) G01S 13/74 (2006.01) G06K 7/00 (2006.01)

Patent

CA 2333142

A locating system and method employs a plurality of radio frequency readers (10, 20, 30) arrayed with respect to a region having a plurality of zones (Z10, Z12, Z123, Z20A, Z20B, Z23, Z30) within which a plurality of radio frequency tags (50, 52, 54, 56, 58) are to be located. Each reader (10, 20, 30) identifies those tags (50, 52, 54, 56, 58) present within its coverage area (12, 22, 32). The coverage areas (12, 22, 32) of all the readers (10, 20, 30) taken together substantially cover the region and at least part of the coverage area (12, 22, 32) of each reader (10, 20, 30) overlaps at least part of the coverage area (12, 22, 32) of at least one other reader (10, 20, 30). A data processor (40) receives the identification (110) of the tags (50, 52, 54, 56, 58) within the coverage area (12, 22, 32) of each reader (10, 20, 30) and applies a set of locating rules (112) to determine therefrom in which zone (Z10, Z12, Z123, Z23, Z30) within the region each identified tag is located (114).

L'invention porte sur un procédé et un système de localisation utilisant une pluralité de lecteurs (10, 20, 30) à radiofréquences disposés en réseau par rapport à une région possédant une pluralité de zones (Z10, Z12, Z123, Z20A, Z20B, Z23, Z30) dans lesquelles une pluralité d'étiquettes (50, 52, 54, 56, 58) à radiofréquences doivent être localisées. Chaque lecteur (10, 20, 30) identifie ces étiquettes (50, 52, 54, 56, 58) présentes dans cette zone (12, 22, 32) de couverture. Les zones (12, 22, 32) de couverture de tous les lecteurs (10, 20, 30) réunis recouvrent pratiquement la région et au moins une partie de la zone (12, 22, 32) de couverture de chaque lecteur (10, 20, 30) d'au moins l'autre lecteur (10, 20, 30). Un processeur (40) de données reçoit l'identification (110) des étiquettes (50, 52, 54, 56, 58) dans la zone (12, 22, 32) de couverture de chaque lecteur (10, 20, 30) et applique un ensemble de règles (112) de localisation de façon à déterminer dans quelle zone (z10, Z12, Z123, Z23, Z30) de la région est localisée (114) chaque étiquette identifiée.

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