G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 13/74 (2006.01) G01S 13/76 (2006.01) G08B 21/02 (2006.01) G01S 5/00 (2006.01) G01S 5/14 (2006.01) G01S 13/78 (2006.01) G01S 13/87 (2006.01)
Patent
CA 2255829
A method and a system for monitoring a plurality of movable objects, wherein each of the objects is equipped with a transponder with which a stationary node is arranged to communicate. Each transponder is caused to reply to a unique signal from the node and each transponder that sends a response signal gives to the response signal a transponder identification addition. A node is caused to detect the speed and direction at which each transponder moves towards and away from the node. Movement of the transponder relative to the node is evaluated by node associated means on the basis of the speed and direction of the transponder. A register over those transponders with which the node shall communicate is set-up for each node. A plurality of separate nodes are provided and each node is provided with such a register. The nodes are arranged to communicate with one another, so as to enable a node to record in its monitoring register a transponder from another node.
Ce procédé et ce système servent à surveiller plusieurs objets mobiles, chacun de ces objets étant équipé d'un transpondeur avec lequel un noeud fixe est amené à communiquer. Chaque transpondeur est amené à répondre à un signal unique provenant du noeud et chaque transpondeur qui envoie un signal de réponse attribue à ce signal de réponse un signe supplémentaire d'identification du transpondeur. Un noeud est amené à détecter la vitesse et la direction auxquelles chaque transpondeur se déplace dans des directions le rapprochant et l'éloignant du noeud. Les déplacements du transpondeur par rapport au noeud sont évalués par un moyen associé au noeud sur la base de la vitesse et de la direction du transpondeur. Un registre relatif à ces transpondeurs avec lesquels le noeud doit communiquer est établi pour chaque noeud. Plusieurs noeuds séparés sont prévus et chaque noeud est pourvu d'un tel registre. Les noeuds sont amenés à communiquer entre eux, afin de permettre à un noeud d'enregistrer dans son registre de surveillance un transpondeur d'un autre noeud.
Ridout & Maybee Llp
Unwire Ab
LandOfFree
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