System and method for locating objects and communicating...

H - Electricity – 01 – Q

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H01Q 11/02 (2006.01)

Patent

CA 2600708

Communication between a remote locator and a transponder is used to determine the relative position of the transponder. The transponder and locator each include a transmitter and a receiver. The locator transmits an inquiry in the form of a relatively powerful cyclically encoded signal with repetitive elements, uniquely associated with a target transponder. Periodically, each transponder correlates its coded ID against a possible inquiry signal, determining frequency, phase and framing in the process. Upon a match, the transponder transmits a synthesized response coherent with the received signal. The locator integrates multiple cyclical response elements, allowing low-power transmissions from the transponder. The locator correlates the integrated response, determines round-trip Doppler shift, time-of-flight, and then computes the distance and angle to the transponder. The transponder can be wearable, bionically implanted, or attached to, or embedded in, some object.

Dans cette invention, on utilise la communication entre un localisateur distant et un transpondeur pour déterminer la position relative du transpondeur. Le transpondeur et le localisateur comprennent chacun un émetteur et un récepteur. Le localisateur transmet une demande sous la forme d'un signal relativement puissant codé cycliquement comportant des éléments répétitifs, associé de façon unique à un transpondeur cible. Périodiquement, chaque transpondeur met en corrélation son identification codée avec un signal de demande possible, déterminant la fréquence, la phase et la structure de trame dans le processus. En cas de correspondance, le transpondeur transmet une réponse synthétisée cohérente avec les signal reçu. Le localisateur intègre de multiples éléments de réponse cyclique, permettant ainsi des transmissions de faible puissance à partir du transpondeur. Le localisateur met en corrélation la réponse intégrée, détermine le décalage Doppler aller-retour et le temps de vol et calcule ensuite la distance et l'angle par rapport au transpondeur. Le transpondeur peut être porté par l'utilisateur, implanté en mode bionique ou fixé ou incorporé à l'objet.

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