METHOD FOR DETECTION OF UNDERWATER SOURCE OF BROADBAND NOISE Russian patent published in 2020 - IPC G01S3/80 

FIELD: hydro acoustics.

SUBSTANCE: method for detecting an underwater source of broadband noise relates to hydroacoustics and can be used in systems for noise direction and underwater monitoring. Method includes reception of broadband source noise by two spaced apart receivers, wherein for each receiver in the received signal time fragments processing cycles, in each formed frequency channel the horizontal energy flow value and the angle of its arrival are calculated, dividing the entire observation horizon of 0–360 degrees into equal horizontal assigned angular sectors, establishing information channels from the formed frequency channels, grouped by the angle of their arrival in the angular sectors with the value of the total energy of the frequency channels included therein above the average value in all assigned sectors, generating from energy channel characteristics spectral energy portraits of the received signal, calculating estimates of current coordinates of the noise source at angles of arrival of energy flows of information frequency channels inherent in both receivers, analyzing the results of processing cycles of time fragments of the received signal and making a decision on detecting a broadband noise source based on a set of data on time stability of spectral energy portraits received by receivers during observation time, and degree of their identity in each receiver, concentration of coordinate estimates in local area, as well as compliance of temporal variability of average values of coordinate estimates to expected dynamics of source motion and location of source is determined by current values of coordinate estimates, and by time variability of coordinate estimates speed and direction of source motion are calculated.

EFFECT: high noise immunity and probability of correct detection of a broadband noise source owing to obtaining and using a much wider range of objective data on the source based on monitoring time stability of angular and spectral characteristics of streams of acoustic energy from a source on information frequencies of the observed frequency range, as well as determining the current location and motion parameters of the source by solving the detection problem from two points of the water area in which the detection object is located.

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