Surface identification using microwave signals for...

A - Human Necessities – 61 – B

Patent

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A61B 5/05 (2006.01)

Patent

CA 2595774

A method and a system of determining a surface location defining an interface between an object to image and an antenna is provided. The method uses geometric principles and the fact that an impedance mismatch at the interface results in significant reflection. A propagation time from the surface to each antenna of a plurality of antennas is estimated. The propagation time locates the surface on a circle centered at each antenna and having a radius calculated using the propagation time. A tangent line connects the intersection of adjacent circles with the surface. The surface is estimated to be located at the tangent point where the circle and the shared tangent line between adjacent antennas intersect. Multiple tangent points may be averaged for each interior antenna. A curve is fit to the set of tangent points to provide an estimate of the surface location.

L'invention concerne un procédé et un système permettant de déterminer un site de surface définissant une interface entre un objet à imager et une antenne. Le procédé utilise des principes géométriques et le fait qu'un défaut d'adaptation d'impédance à l'interface produit une réflexion importante. Le procédé comporte les étapes consistant à: estimer le temps de propagation entre la surface et chaque antenne d'une pluralité d'antennes; placer grâce au temps de propagation la surface sur un cercle centré sur chaque antenne, le rayon du cercle étant calculé à l'aide du temps de propagation; relier par une tangente l'intersection de cercles adjacents avec la surface. On estime que la surface se situe au point de tangence où se coupent le cercle et la tangente partagée par des antennes adjacentes. On peut faire la moyenne de multiples points de tangence pour chaque antenne intérieure. Une courbe est tracée à l'aide de l'ensemble des points de tangence afin de produire une estimation du site de surface.

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