System for ultrasound ranging in the presence of ultrasound...

G - Physics – 01 – S

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G01S 11/14 (2006.01) A61B 8/08 (2006.01) G01S 5/30 (2006.01)

Patent

CA 2493711

A distance measuring system comprises first and second transducers, and an ultrasound ranging subsystem coupled to the first and second transducers for performing a plurality of distance measurements between the first and second transducers. The distance measuring system further comprises a filter coupled to the ultrasound ranging subsystem for filtering ultrasound interference from the plurality of distance measurements (such as, e.g., eight), and outputting a distance based on the filtered distance measurements. The filter filters the ultrasound interference by selecting one of the plurality distance measurements, in which case, the outputted distance is the selected distance measurement. Because the ultra sound interference will typically represent itself as the shortest distance measurement, the selected distance measurement is preferably greater than the minimum distance measurement (such as, e.g., the maximum distance measurement), thereby filtering the ultrasound interference out.

L'invention concerne un système de mesure de distance qui comprend un premier et un deuxième transducteur, et un sous-système de télémétrie par ultrasons couplé auxdits transducteurs pour effectuer une pluralité de mesures de distance entre ceux-ci. Le système de mesure de distance comprend en outre un filtre, couplé au sous-système de télémétrie, pour filtrer le brouillage d'ultrasons de la pluralité de mesures de distance (p. ex. huit) et produire une distance sur la base des mesures de distance filtrées. Le filtre filtre le brouillage d'ultrasons en sélectionnant une des multiples mesures de distance, et, dans ce cas, la distance produite est la mesure de distance sélectionnée. Comme le brouillage d'ultrasons représente typiquement la mesure de distance la plus courte, la mesure de distance sélectionnée est de préférence supérieure à la mesure de distance minimum (p. ex. mesure de distance maximum), ce qui permet d'éliminer par filtrage le brouillage d'ultrasons.

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