Identification of objects by a reader

G - Physics – 06 – K

Patent

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G06K 7/00 (2006.01)

Patent

CA 2321673

An identification system is provided for identifying a plurality of object-based transponders (14, 16, 18, 20) using an interrogator (10). The interrogator (10) includes a transmitter for transmitting an interrogation signal to the transponders, a receiver for receiving identification signals from the transponders, and processor means (21) for determining the individual and connect receipt of an identification signal. The transponders operate on the basis of backscatter modulation, and include a detector for detecting the presence of an interrupt signal from the interrogator. Control logic responsive to the detector is arranged to cease signal transmission from the transponder if the transponder completes transmission of the identification signal without receiving an interrupt signal during such transmission. The interrogator (10) is arranged to receive the identification signals from the transponders (14, 16, 18, 20) and substantially contemporaneously to determine if any identification signal has been individually and correctly received. In the event of any identification signal not being individually and correctly received, the interrogator (10), at substantially the same time, transmits a common interrupt signal for temporarily suspending signal transmission from the transponder (14) if the transponder is transmitting its identification signal at the time it receives the interrupt signal. The transponder (14) independently ceases signal transmission if it completes transmission of an identification signal without receiving an interrupt signal.

L'invention concerne un système d'identification permettant d'identifier une pluralité de transpondeurs (14, 16, 18, 20) basés objet, utilisant un interrogateur (10). L'interrogateur (10) comprend un émetteur permettant d'émettre un signal d'interrogation vers les transpondeurs, un récepteur permettant de recevoir des signaux d'identification des transpondeurs et un processeur (21) permettant de déterminer la réception individuelle et correcte d'un signal d'identification. Les transpondeurs fonctionnent sur la base d'une modulation de rétrodiffusion et comprennent un détecteur permettant de détecter la présence d'un signal d'interruption provenant de l'interrogateur. Une logique de commande sensible au détecteur est arrangée de façon à interrompre une transmission de signal provenant du transpondeur si celui-ci achève une transmission du signal d'identification sans recevoir de signal d'interruption pendant cette transmission. L'interrogateur (10) est organisé de façon à recevoir les signaux d'identification des transpondeurs (14, 16, 18, 20) et à déterminer sensiblement simultanément si un signe d'identification a été individuellement et correctement reçu. Dans le cas où un signal d'identification n'a pas été individuellement et correctement reçu, l'interrogateur (10), sensiblement au même moment, transmet un signal d'interruption commun qui suspend temporairement une émission de signal provenant du transpondeur (14), si celui-ci transmet son signal d'identification au moment où il reçoit le signal d'interruption. Le transpondeur (14) interrompt indépendamment une transmission de signal si il achève une transmission d'un signal d'identification sans recevoir de signal d'interruption.

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