METHOD OF DETECTING THE NOISE-PRODUCING, MOVING IN THE SEA OBJECTS Russian patent published in 2018 - IPC G01S15/04 

FIELD: hydro acoustics.

SUBSTANCE: invention relates to the field of hydroacoustics and can be used in noise control systems. Detection method includes receiving noise signal with combined receiver comprising a sound pressure receiver and a three-component receiver of the vibrational speed vector, frequency-time processing of the received signal, calculation in each frequency channel, which is formed as a result of frequency-time processing of the received noise signals, complex amplitudes of noise pressure, three components of the vibrational velocity vector, for the total process, the signal plus interference and for the interference separately, the formation in each frequency channel of the values averaged over the time T₁ of seven informative parameters, three components of the real component of the intensity vector, three components of the imaginary component of the intensity vector and the square of the noise pressure, centering and rationing for signal interference for three components of the real component of the intensity vector, three components of the imaginary component of the intensity vector and the square of the sound pressure, secondary spectral analysis of power fluxes for three components of the real component of the intensity vector, three components of the imaginary component of the intensity vector and the square of the noise pressure in the given frequency range of the secondary spectrum for the total process, the signal plus interference and for the interference separately, centering, rationing for interference and selection of the spectral component of the secondary spectrum with the maximum signal-to-interference ratio, the formation in each frequency channel, based on the results of the primary and secondary spectral analysis, of 14 informative parameters, which are normalized for the interference, calculation of the maximum signal-to-interference ratio for one of the 14 informative parameters and making the decision to detect by comparison with the threshold value of the signal-to-noise ratio of the maximum signal-to-noise ratio, which is calculated in one of the 14 informative parameters.

EFFECT: technical result is increased interference immunity and range of the receiving system at low frequencies in shallow and deep sea conditions by means of using the receiver system based on the combined receiver, in which a lot of informative parameters are formed.

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