METHOD OF DETECTING NOISY OBJECTS IN SHALLOW AND DEEP SEA Russian patent published in 2018 - IPC G01S3/80 

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 by a 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 formed as a result of frequency-time processing of the received noise signals, complex amplitudes of sound pressure, three components of the vibrational speed vector, three components of the real component of the intensity vector and three components of the imaginary component of the intensity vector in the local coordinate system associated with the combined receiver, for the total process, the signal plus interference and for the interference separately, the formation in each frequency channel averaged over a time T₁ values of 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, the formation in each frequency channel averaged over a time T₂=10 T₁ complex amplitudes of the zero and first harmonics of the secondary spectrum for the 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, rationing of all 21 informative parameters computed for the total signal plus interference process by the corresponding values of the informative parameters calculated for the interference, calculating the maximum signal-to-interference ratio for one of the 21 informative parameters, and making the detection decision by comparing the signal-to-interference ratio of the maximum signal-to-interference ratio calculated in one of the 21 informative parameters to a threshold value.

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

1 cl, 1 dwg