Object location system and method using rfid

G - Physics – 01 – S

Patent

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G01S 13/87 (2006.01) G01S 13/32 (2006.01)

Patent

CA 2557341

A system and method is provided for locating objects using RFID tags. The system and method uses an RFID reader and a distance calculator to efficiently and accurately determine the location of objects that include an RFID tag. The RFID reader transmits a plurality of signals to the RFID tag, with the plurality of signals having different fundamental frequencies. In response, the RFID tag backscatter modulates the plurality of transmitted signals to create a plurality of backscatter-modulated signals. The RFID reader receives and demodulates the plurality of backscatter-modulated signals. The distance calculator determines the phase of the plurality of backscatter-modulated signals and determines a rate of change of the phase in the backscatter- modulated signals with respect to the rate of change in the fundamental frequency of the transmitted signals and uses this information to calculate the distance to the RFID tag.

L'invention concerne un système et un procédé permettant de localiser des objets au moyen d'étiquettes RFID. Le système et le procédé utilisent un lecteur RFID et un calculateur de distance pour déterminer efficacement et avec précision l'emplacement des objets comportant une étiquette RFID. Le lecteur RFID envoie plusieurs signaux à l'étiquette RFID, lesquels signaux ont plusieurs fréquences fondamentales différentes. En réponse, la rétrodiffusion de l'étiquette RFID module les signaux envoyés de façon à créer plusieurs signaux modulés en rétrodiffusion. Le calculateur de distances détermine la phase des signaux modulés en rétrodiffusion, ainsi qu'un vitesse de changement de la phase dans les signaux modulés en rétrodiffusion par rapport à la vitesse de changement au niveau de la fréquence fondamentale des signaux envoyés et utilise cette information pour calculer la distance jusqu'à l'étiquette RFID.

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