MODE OF FORMING BY A WORKING SECTOR OF FREQUENCY-MODULATED DIRECTION CHARACTERISTIC OF A SONAR MULTI-ELEMENT CIRCULAR ANTENNA Russian patent published in 2007 - IPC G01S15/00 

FIELD: the invention refers to underwater acoustics particularly to radiating sections of hydro locators using circular antennas.

SUBSTANCE: the technical result of the invention is possibility of forming a relatively narrow direction characteristic (less then 40^o-30^o) in a wide diapason of frequencies by the sector of the circular antenna of relatively small wave dimensions. For obtaining the indicated result the mode of forming a frequency-independent direction characteristic by the sector of the multi-element hydro acoustic radiating circular antenna includes excitation of each n-element of the sector with an electric signal with a weighting coefficient , where ϕ_n - an angular position of the element of the antenna, taking a reading from the symmetry axle of the sector, ϕ_o -the half-width of the sector and radiation of acoustic signals by elements of the sector into water medium different by the fact, that electrical signals of excitation of each of n elements of the sector delay for a time , where r - the radius of the antenna; c- the sound speed in the water; α - a coefficient whose value is chosen in accordance with approximate formula .

EFFECT: possibility of forming a narrow direction characteristic in a width diapason of frequencies.

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