METHOD OF DETERMINING COORDINATES OF NOISY OBJECTS USING VERTICALLY DEVELOPED LOWERED UNFOLDING SOUND-TRANSPARENT ANTENNAE OF HYDROACOUSTIC SYSTEMS Russian patent published in 2024 - IPC G01S3/80 

FIELD: hydroacoustics.

SUBSTANCE: invention relates to hydroacoustics and can be used for passive determination of coordinates of a near-surface noisy in the sea object (NO) in conditions of existence of far zones of acoustic illumination (FZAI), namely: direction of movement of NO, speed of mutual change of distance between carrier of receiving antenna of hydroacoustic complex (HAC) and NO, as well as distance to NO. Angles of arrival of beams symmetric in the vertical plane touching the surface and the sea bottom are determined; a vertical fan of the DP oriented to these angles is formed, and the moments of arrival of the beams symmetrical in the vertical plane are measured. When detecting a signal from a NO, the moments of time of detection and loss of signals are measured, and a decision on the direction of movement of the noisy object is made from the DP angle of detection of the signal. By measuring the difference in detection time moments (loss) at symmetrical angles relative to the horizontal plane of signals propagating along the "HH" and "BH" or "HB" and "BB" families of beams, and having calculated the horizontal distance travelled by the beam coming out of the horizon of the receiver at an angle upwards and returning to this horizon from above, the rate of mutual change in the distance between the NO and the receiving antenna of the HAC is determined. Width of the lower and upper half-zones of the FZAI is measured from the time of detection (loss) of the signal in the DP formed at symmetrical angles. By comparing the measured and calculated half-zone widths, the number of the FZAI and the initial distance to the NO at the moment of its detection are determined. According to initial distance and radial speed of NO current distance to NO is calculated.

EFFECT: high accuracy of determining coordinates of detected NOs in conditions of far zones of acoustic illumination.

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