Method of detecting and viewing low-power moving acoustic...

G - Physics – 01 – S

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G01S 3/801 (2006.01)

Patent

CA 2569815

The invention relates to a method which is suitable for use in the field of underwater detection and, more specifically, to the problem associated with the detection of low-power acoustic underwater objects by passive detection systems, of the passive drifting buoy type, which are used, for example, by maritime patrol systems. The inventive method consists in processing the complex amplitude/azimuth spectrum of an acoustic signal received by a directional buoy. For different envisaged target models, the aforementioned processing comprises: (i) the association of the complex frequency components of the received signal, which are located along the time-evolution curve of the frequency of a signal corresponding to a model target; and (ii) a comparison of the module and argument variation of said frequency components with the module and argument variation over time of the spectral components of the signal corresponding to the model. For said purpose, the processing involves the use of both the amplitude and azimuth information contained in the signal received. According to the invention, the processing can be used to produce representations of the evolution of the signal received, both in frequency form and in geographical form. In addition, the invention enables the fusion of data originating from several buoys being used simultaneously in the same zone.

Le procédé selon l'invention concerne le domaine de la détection sous-marine et traite en particulier du problème de la détection d'objets sous- marin faiblement sonores par des systèmes de détection passifs, du type des bouées passives larguées, utilisées par les systèmes de patrouille maritime par exemple. Le procédé consiste dans un traitement du spectre complexe amplitude - azimut d'un signal acoustique reçu par une bouée directive. Ce traitement effectue, pour différents modèles de cibles envisagés, l'association des composantes fréquentielles complexes du signal reçu, situées le long de la courbe d'évolution au cours du temps de la fréquence d'un signal correspondant à une cible modèle, et la comparaison de la variation en module et en argument de ces composantes fréquentielles à la variation en module et en argument au cours du temps des composantes spectrales du signal correspondant au modèle, le traitement utilisant à la fois les informations d'amplitude et d'azimut contenues dans le signal reçu. Le traitement selon l'invention permet de réaliser des représentations de l'évolution du signal reçu aussi bien sous une forme fréquentielle que sous une forme géographique. Il permet en outre la fusion de données provenant de plusieurs bouées exploitées simultanément sur une même zone.

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