METHOD FOR PASSIVELY DETERMINING SPATIAL POSITION OF DETECTED UNDERWATER OBJECT NOISY IN SEA USING POSITIONAL STATIONARY HYDROACOUSTIC COMPLEX Russian patent published in 2023 - IPC G01S3/80 

FIELD: hydroacoustics.

SUBSTANCE: intended to determine the position of a detected object in space when processing the received noise emission signal of the object by a stationary hydroacoustic complex. The method includes receiving a hydroacoustic noise signal with a hydroacoustic antenna, converting the received analog signal into digital form, tracking a noisy object in the noise direction finding mode, spectral analysis of the hydroacoustic noise signal in a wide frequency band F_l - F_up, where F_l and F_up are the lower and the upper frequency of the range of processing of the noise emission signal by equipment, determination of interference and measurement of the signal spectrum, reception of the hydroacoustic noise signal is carried out with a hydroacoustic antenna of a positional stationary hydroacoustic complex, determine the frequency F_max of the spectral component at which the amplitude of the received signal is maximum A_max, determine the frequency value F_0.5 for the spectral component, the signal amplitude of which is 0.5 A_max, and if the frequency value F_0.5<F_max, then determine the lower frequency of the spectral component of the spectrum at which the signal amplitude exceeded the threshold, take it as the lower limit frequency F_ls of the noise emission range of a noisy object, determine the resolution of the frequency range of the noise direction finding system in depth Δ_fr, where Δ_fr = (F_up - F_l)/H where H is the expected maximum depth of the object, the band of the missing low-frequency part of the noise emission signal is determined as the difference between the value of the lower limit frequency of the received signal F_ls and the lower limit frequency of the equipment F_l(F_ls - F_l), and the expected depth of the noisy object H_ob is determined as H_ob = (F_ls - F_l)/ Δ_fr.

EFFECT: simplifying the method for determining the depth of a source noisy in the sea and increasing its reliability.

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