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 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 the vertical component 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 of an 8-channel static fan of directivity characteristics in the horizontal plane possessing a one-sided directionality, the formation in each frequency channel of a 4-channel static fan of directivity characteristics in the vertical plane that have a one-sided directionality, computation of the components of the one-way directed intensity vector in all 12-spatial channels for the total process, the signal plus interference and for interference separately, the normalization in all 12-spatial channels of the components of the one-way directed intensity vector calculated for the total signal plus interference process to the corresponding components of the one-way directed intensity vector calculated for the interference, after which the maximum signal-to-interference ratio is calculated in one of the 13 channels, 12 spatial channels and the sound pressure channel, and making a detection decision by comparing the maximum signal-to-interference ratio calculated in one of the 13 channels, 12 spatial channels and the sound pressure channel to a threshold value of the signal-to-interference ratio.
EFFECT: increase noise immunity and range of the receiving system at low frequencies in shallow sea conditions by using a receiving system that has directivity in shallow sea conditions at any arbitrarily low frequencies.
1 cl, 1 dwg
