Rf system for tracking objects

G - Physics – 01 – S

Patent

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Details

G01S 13/75 (2006.01) A61B 19/00 (2006.01)

Patent

CA 2601632

A system (10) for tracking an object in space for position, comprises a transponder device (12) connectable to the object. The transponder device (12) has one or several transponder aerial(s) (20) and a transponder circuit (21) connected to the transponder aerial (20) for receiving an RF signal through the transponder aerial (20). The transponder device (12) adds a known delay to the RF signal thereby producing an RF response for transmitting through the transponder aerial (20). A transmitter (42) is connected to a first aerial (43) for transmitting the RF signal through a first aerial (43). A receiver (42) is connected to the first, a second and third aerials (43, 44, 45) for receiving the RF response of the transponder device (12) therethrough. A position calculator (46) is associated to the transmitter (42) and the receiver (42) for calculating a position of the object as a function of the known delay and the time period between the emission of the RF signal and the reception of the RF response from the first, second and third aerials (43, 44, 45). A method is also provided.

La présente invention concerne un système (10) de suivi de position 3D d'objet comprenant un transpondeur (12) se reliant à l'objet. Le transpondeur (12) porte au moins une antenne (20) et un circuit (21) branché sur l'antenne (20) de façon à recevoir un signal radio via cette antenne (20). Le transpondeur (12) ajoute au signal radio un retard connu, ce qui constitue une réponse radio pour l'émission via l'antenne (20) du transpondeur. Un émetteur (42) est branché sur une première antenne (43) de façon à émettre le signal radio via cette première antenne (43). Un récepteur est branché sur les trois antennes (43, 44, 45) de façon à recevoir par leur intermédiaire la réaction radio du transpondeur (12). Un calculateur de position (46) associé à l'émetteur (42) et au récepteur (42) pour calculer une position de l'objet en fonction du retard connu et de la période de temps écoulé entre l'émission du signal radio et la réception du signal radio de réponse en provenance de la première, de la deuxième et de la troisième des antennes (43, 44, 45). L'invention concerne également un procédé correspondant.

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