1 - L'identification de fronts d'ondes corrélés et distordus

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URI: http://hdl.handle.net/2042/1634
Title: 1 - L'identification de fronts d'ondes corrélés et distordus
Author: MUNIER (J.)
Abstract: On montre qu'il existe une variante de la méthode des éléments propres, fondée sur la relation de dépendance linéaire existant entre les lignes de la matrice-sources
Description: Over the past 2 decades, the spatial analysis methods developed were based upon restricting hypotheses that are not fulfilled in practical cases and, therefore, often yield disappointing results . This is particularly true when uncorrelated sources, plane wavefronts and identical sensors hypotheses are introduced . In a classical approach, source parameters estimates are obtained using the information contained in the eigenvalues and eigenvectors of the received signais cross-spectral matrix . Making use of the properties of this matrix, an alternate version of the eigensystem method based upon the linear dependency between the source-matrix rows is shown to exist . A deep insight into the causes of performance loss clearly shows an interest for an estimation as compiete as possible of the distorted wavefronts . Letting the modules of the sources-vectors elements being equal, a new algorithm which permits the estimation of their phases is finally adressed .
Subject: Traitement signal; Signal acoustique; Antenne acoustique; Analyse spatiale; Onde acoustique; Front onde; Distorsion signal; Source sonore; Matrice interspectrale; Source corrélée
Publisher: GRETSI, Saint Martin d'Hères, France
Date: 1987

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