Method for optimizing the power supply for a towed linear...

G - Physics – 01 – S

Patent

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G01S 7/521 (2006.01) H01Q 1/34 (2006.01)

Patent

CA 2650525

The invention relates to sonar transmission means and in particular to transmission means that enable the implementation of an omnidirectional acoustic transmission. The invention relates to a method for implementing an omnidirectional transmission using a towed linear aerial of length L greater than the wave length of the output signal, constituted by a plurality of P projectors, with the space between projectors being substantially less than /2. The inventive method consists mainly in applying to each projector an output signal emanating from a common output signal, said common signal being assigned a delay expressed in accordance with a law that comprises a non-linear term dependent on the position of the projector in the aerial, the application of said law enabling the sendout chart angular aperture to be modulated. The invention enables in particular the implementation of sonar detection systems that comprise transmitting and receiving aerials of substantially identical diameter which can be wound onto one and the same winch without it being necessary to separate them.

L'invention concerne les moyens d'émission sonar et en particulier les moyens d'émission permettant de réaliser une émission acoustique omnidirectionnelle. L'invention porte sur un procédé pour réaliser une émission omnidirectionnelle au moyen d'une antenne linéaire tractée de longueur L supérieure à la longueur d'onde ? du signal émis, constituée d'une pluralité de P projecteurs l'espacement entre projecteurs étant sensiblement inférieur à ?/2. Le procédé selon l'invention consiste principalement à appliquer sur chaque projecteur un signal d'émission issu d'un signal d'émission commun, ce signal commun étant affecté d'un retard dont l'expression suit une loi comportant un terme non linéaire fonction de la position du projecteur dans l'antenne. l'application de cette loi permettant de moduler l'ouverture angulaire du diagramme d'émission. L'invention permet en particulier de réaliser des systèmes de détection sonars, comportant des antennes d'émission et de réception ayant des diamètres sensiblement identiques qui peuvent être enroulées sur un même treuil sans qu'il soit nécessaire de les séparer.

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