METHOD FOR OBTAINING INFORMATION ABOUT AN UNDERWATER NOISE EMITTING OBJECT Russian patent published in 2023 - IPC G01S3/80 

FIELD: hydroacoustics.

SUBSTANCE: invention can be used to solve problems of processing the noise emission signal of an object in hydroacoustic systems, and is intended to determine the moment in time when an underwater moving object, observed by means of noise direction finding, makes a manoeuvre along the depth of its immersion. The method is based on receiving a hydroacoustic noise signal of an object by a multi-element antenna with a developed aperture in a vertical plane, calculating a set of signal autocorrelation functions over a number of successive time intervals, followed by determining a set of time delays between paired beams, which appear as abscissas of local maxima of autocorrelation functions. When implementing the method, the receiving antenna is additionally lowered to a depth that obviously exceeds the maximum possible immersion depth of the investigated underwater object, and to determine the object's manoeuvre in depth, an analysis of the dynamics of the time delay between the arrival of a pair of angle-unresolvable rays is used.

EFFECT: automatic determination of the moment when the object changes the immersion depth and a significant reduction in the number of arithmetic operations relative to the prototype method, which allows the proposed method to be applied in conditions of limited computing resources and (or) in the absence of a human operator, for example, on board autonomous uninhabited underwater vehicles.

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