METHOD FOR PASSIVE DETERMINATION OF COORDINATES OF NOISY OBJECT IN THE SEA Russian patent published in 2016 - IPC G01S3/80 

FIELD: acoustics.

SUBSTANCE: invention relates to hydroacoustic equipment and can be used to solve tasks of passive determination of coordinates of a noisy object in the sea, namely, the distance, the depth and the bearing during propagation of hydroacoustic signals in the sea. Technical result is achieved by that the method of passive determination of coordinates of a noisy object in the sea, according to which hydroacoustic field signals of a noisy object in the sea are received, involves frequency-time processing of the received hydroacoustic signals coming at different angles due to vertical refraction of the sound, measuring the sound speed in water depending on the depth and heaving of the sea, calculation by the measured data and known characteristics of the sea bottom of the noisy object signal, solving an equation of hydroacoustics in passive mode for the noisy object in the sea, receiving of the hydroacoustic signals is performed by a spatially developed in the vertical and horizontal planes antenna, those signals are preliminarily amplified and filtered within a frequency band, after which the signals are digitized, space-time processing of the signals is carried out, followed by mutually correlation processing of at least one pair of the signals in the vertical plane, pairs of signals are identified with high values of maximum of the mutual correlation function, measured are angles of arrival of those signals propagating along separate beam paths in the vertical plane, measured is the propagation time difference from the position of maximum of the mutual correlation function on the time axis, as well as measured is the ratio of averaged values of energies for each pair of the signals, then from the point of location of the receiving antenna beam paths are calculated for the measured angles of arrival of the signals in the vertical plane for the pairs of signals with high values of maximum of the mutual correlation function and distances and depths of points of the paths intersection are found, then at each point of the paths intersection for all pairs of the signals propagating along those beam paths calculated are time differences of propagation and the ratio of energies, compared are the measured and the calculated time differences of propagation and ratios of the averaged values of energies for all pairs of the signals, and coordinates of the noisy object in the sea are determined by the point of intersection of the beam paths, for which the most close are the measured and the calculated values of the ratios of energies and the propagation time differences for all pairs of the signals propagating along separate beam paths.

EFFECT: technical result of the invention is higher accuracy of determining coordinates of a noisy object due to elimination of uncertainty when calculating signals delays, as well as measuring ratios of energies of signals propagating along separate beam paths in the vertical plane from one bearing point.

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