MODE OF FORMING A DIRECTION CHARACTERISTIC OF A MULTI-ELEMENT DISRETE SONAR ANTENNA Russian patent published in 2007 - IPC G01S15/00 

FIELD: the invention refers to the field of underwater acoustics technique connected with radiation of sonar tonal and tonal-impulse signals of great intensity in a limited space sector.

SUBSTANCE: it may be used in radiating sections of sonars, hydro acoustic logs and other hydro acoustic means. The technical result of the invention is in creation of possibility of radiation of wide axially symmetric sectors of space with an acoustic signal whose intensity exceeds in many times the intensity of the signal which may be achieved at forming with known modes of direction characteristic of the same width and also creation of possibility of operational management of the width of the direction characteristic by way of changing the value of the coefficient G. For provision of this technical result the mode of forming direction characteristic of a multi-element discrete hydro acoustic antenna has a plane aperture limited with a circumference whose radius is greatly more than the length of the wave sound in the water and whose aperture is divided on N zones inside whose frontiers the elements of the indicated antenna are electrically united and form sections; it includes incoherent excitation by the electric signals of the elements, entering in different sections, transformation of the electric signals of excitation by the elements into sound vibrations and radiation of sound waves by working surfaces of the elements , the frontiers of the zones are concentric circumferences, and the phases of excitation of the elements of the sections are defined by the law: where ϕ_n -a phase of excitation of the elements of the sections with the index n; - the coefficient defining the depth of the phase distribution; r_n - an average radius of the section with index n; R - a radius of the aperture of the antenna, C - an arbitrary constant. For reducing non-uniformity of the direction characteristic in the space sector where signal of great power is radiated it is suggested to introduce amplitude distribution and for simplification of realization of the mode it is proposed to unite in one channel of excitation of the antenna the elements of the sections whose phases of the signals of excitation differ on 2π.

EFFECT: creates possibility of radiation of wide axially symmetric sector of space with an acoustic signal.

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