METHOD OF PASSIVE AUTOMATIC HYDROACOUSTIC DETECTION OF MARINE OBJECTS Russian patent published in 2018 - IPC B63G9/00 

FIELD: hydro acoustics.

SUBSTANCE: invention relates to the field of hydroacoustics and is intended for the detection of marine objects in conditions of a high level of interference. Achievement of this technical result is provided in the proposed method for passive automatic hydroacoustic detection of marine objects, in which the received hydroacoustic signal is analyzed and the surrounding space is monitored thereon, signals emitted by the marine objects are received and a data package is generated at each instant for the received signal in the form of received signal levels for a plurality of bearings – angles ψi, where ψi takes values from 0 to 360° with discreteness dψ, equal to one degree, data packages are accumulated for a predetermined time t with a discrete reception of the dt packages, and a current two-dimensional image, having a height equal to the number of elements of the data package and a width corresponding to the time delay t by L units, where L is the number of accumulated packages for time t, is formed for further processing, all points in the generated two-dimensional current image are analyzed on a vertical column with the horizontal coordinate of the vertical column equal to L/2-middle of the current image, point belonging to the trajectories of the targets are found on the analyzed vertical by comparing with the threshold, upon receipt of each new data package the current image is shifted left by one pixel and the next right package is recorded in the rightmost column of the images, and the leftmost package is deleted, then the shifted current image formed from the received data packages is processed by analyzing the vertical column in the middle of the image with the horizontal coordinate of the vertical column equal to L/2-middle of the current image, and new target points are obtained determining the target path points when the data packages are sequentially received and the generated current images are processed.

EFFECT: technical result of the proposed invention is an increase in noise immunity and stealth of marine object detection.

1 cl, 3 dwg