Improvement to a method for controlling an autonomous mobile...

G - Physics – 05 – D

Patent

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G05D 1/02 (2006.01)

Patent

CA 2474946

The invention concerns a navigation device for a mobile robot comprising means for measuring the amplitude and the phase of an electromagnetic signal emitted by a wire acting as limit for a working area of the robot. The measuring means samples the amplitude of the signal during each time interval, the result of each measurement is stored in a memory and the measurements are repeated for several time intervals, the collected results being added in said memories until the content of a memory reaches a reference threshold. The number of samples required and the content of each memory is interpreted by numerical analysis to determine the distance or distance variation relative to said limiting elements. Any phase change corresponding to a passage beyond the limiting wire is easily detected and results for example in a command returning the robot to its working area.

L'invention concerne un dispositif de navigation pour robot mobile comportant un moyen de mesure de l'amplitude et de la phase d'un signal électromagnétique périodique émis par un fil faisant office de limite pour une surface de travail du robot. Le moyen de mesure effectue un échantillonnage de l'amplitude du signal durant chaque période, le résultat de chaque mesure de l'échantillonnage est stocké dans une mémoire et les mesures sont répétées pendant plusieurs périodes, les résultats récoltés étant additionnés dans lesdites mémoires jusqu'à ce que le contenu d'une mémoire atteigne un seuil de référence. Le nombre d'échantillonnages nécessaire et le contenu de chaque mémoire est interprété par analyse numérique pour déterminer la distance ou variation de distance par rapport auxdits éléments de limite. Tout changement de phase correspondant au passage au delà du fil de limite est aisément détecté et résulte par exemple en une commande de retour du robot vers sa zone de travail.

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