Reduction of noise in electrical field measurements

Details Reduction of noise in electrical field measurements Reduction of noise in electrical field measurements

G - Physics

01

V

G01V 3/12 (2006.01)

Patent

CA 2659401

A method for removing cultural noise from a measurement of the field generated by an electromagnetic source, such as a current bi-pole or a magnetic loop source, the method comprising: simultaneously measuring the electromagnetic signal at a field measurement position and a calibration position close to the field measurement position, but in a null field of the source; using the field measurement and the calibration measurement to compute a filter that estimates the component of the field measurement that is correlated with cultural noise; convolving the computed filter with the calibration measurement to yield the estimated cultural noise component, and subtracting that component from the field measurement.

L'invention concerne un procédé permettant d'éliminer le bruit culturel d'une mesure du champ mesuré par une source électromagnétique, telle qu'une source bipolaire de courant ou à boucle magnétique. Le procédé comprend les étapes suivantes: mesure simultanée du signal électromagnétique dans une position de mesure de champ et une position de calibrage proche de la position de mesure du champ, mais dans un champ nul de la source; utilisation de la mesure de champ et de la mesure de calibrage de manière à informatiser un filtre qui estime que le composant de la mesure de champ est mise en corrélation avec le bruit culturel; et convolution du filtre informatisé avec la mesure du calibrage de manière à produire le composant de bruit culturel estimé, et la soustraction du composant de la mesure du champ.

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