Self-focusing method for synthetic antenna sonars

Details Self-focusing method for synthetic antenna sonars Self-focusing method for synthetic antenna sonars

G - Physics

01

S

G01S 7/526 (2006.01) G01S 7/52 (2006.01) G01S 15/89 (2006.01) G10K 11/34 (2006.01) G01S 15/87 (2006.01)

Patent

CA 2230165

Self-focusing methods for synthetic antenna sonars are described, which include using two or more frequencies having differing phase centres, the positions of which move along the physical receiving antenna from one recurrence to the next. In one embodiment of the invention, three distinct frequencies are used, one for imaging and the other two for self-focusing. In another embodiment, two distinct frequencies are used alternately for self-focusing and for imaging. Yet another embodiment provides using all of three or more distinct frequencies for self-focusing and imaging by aperture synthesis, with their transmitting phase centres, which are distributed with a constant pitch along the physical receiving antenna, being displaced in a circular permutation from one recurrence to the next

L'invention concerne les procédés d'autofocalisation pour les sonars à antenne synthétique. Elle consiste à utiliser au moins deux fréquences ayant des centres de phase différents et dont les positions varient le long de l'antenne physique de réception d'une récurrence à la suivante. Dans un mode de réalisation on utilise trois fréquences distinctes, une pour l'image et les deux autres pour l'autofocalisation. Dans un autre mode de réalisation, on utilise deux fréquences distinctes, qui servent alternativement pour l'autofocalisation et pour l'image. Dans un autre mode de réalisation on utilise au moins trois fréquences distinctes qui servent toutes à l'autofocalisation et la formation de l'image par synthèse d'ouverture et dont les centres de phase d'émission, répartis à pas constant le long de l'antenne physique de réception, sont déplacés d'une récurrence à la suivante selon une permutation circulaire.

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