Article tracking system

G - Physics – 01 – S

Patent

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Details

G01S 13/87 (2006.01) G01S 13/84 (2006.01) G06K 7/00 (2006.01) G06K 17/00 (2006.01) G07C 9/00 (2006.01)

Patent

CA 2268951

System for tracking mobile tags. Cell controllers with multiple antenna modules generate a carrier signal which is received by the tags. Tags shift the frequency of the carrier signal, modulate an identification code onto it, and transmit the resulting tag signal at randomized intervals. The antennas receive and process the response, and determine the presence of the tags by proximity and triangulation. Distance of a tag from an antenna is calculated by measuring the round trip signal time. The cell controllers send data from the antenna to a host computer. The host computer collects the data and resolves them into positional estimates. Data are archived in a data warehouse, such as an SQL Server.

L'invention concerne un système destiné à repérer des étiquettes émetteur-récepteur mobiles. Des contrôleurs de cellule possédant des modules d'antenne à usages multiples génèrent un signal de porteuse qui est reçu par les étiquettes. Les étiquettes décalent la fréquence du signal de porteuse, modulent un code d'identification sur celui-ci, et transmettent le signal d'étiquette produit à intervalles aléatoires. Les antennes reçoivent et traitent la réponse, et déterminent l'emplacement de l'étiquette par proximité et triangulation. On calcule la distance séparant l'étiquette d'une antenne en mesurant le temps de parcours du signal. Les contrôleurs de cellule envoient des données de l'antenne à un ordinateur principal. L'ordinateur principal collecte les données et en dérive à des estimations de position. Les données sont archivées dans une unité de stockage de données, tel qu'un serveur SQL.

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