Identification system for monitoring the presence/absence of...

G - Physics – 01 – S

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G01S 1/68 (2006.01) G01V 3/12 (2006.01) G01V 15/00 (2006.01) G06K 7/00 (2006.01) G06K 19/07 (2006.01) H04B 1/59 (2006.01)

Patent

CA 2371343

A system (20) which allows multiple senders (18) to asynchronously transmit identification codes via a common communication channel to enable a central monitor (22) to identify the presence (or absence) of each sender within the monitor's detection zone. Each sender is configured to repeatedly transmit a uniquely encoded identification frame. A frame, in accordance with the invention, is comprised of pulses spaced to minimize pulse collisions and configured to tolerate occasional collisions without impairing the monitor's ability to separately identify each transmitting sender. The identification frame comprises active intervals spaced by inactive intervals.

Cette invention se rapporte à un système (20) qui permet à des émetteurs multiples (18) de transmettre en mode asynchrone des codes d'identification via un canal de communication commun, pour qu'un moniteur central (22) puisse identifier la présence (ou l'absence) de chaque émetteur à l'intérieur de la zone de détection du moniteur. Chaque émetteur est configuré pour transmettre de façon répétée une trame d'identification à codage unique. Selon cette invention, une trame se compose d'impulsions espacées pour réduire au minimum les collisions des impulsions et conçues pour tolérer des collisions occasionnelles sans affecter la capacité du moniteur à identifier séparément chaque émetteur. La trame d'identification comprend des intervalles actifs séparés par des intervalles inactifs.

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