METHOD FOR PROCESSING A PSEUDO-NOISE SIGNAL IN SONAR Russian patent published in 2020 - IPC G01S15/00 

FIELD: hydro acoustics.

SUBSTANCE: invention relates to hydroacoustics and can be used for constructing systems for automatic detection of echo signals received by a sonar on a background of noise and reverberation interference, and measurement of object parameters when using pseudo-noise signals. Disclosed method of processing a pseudo-noise signal in sonar comprises emitting a probing pseudo-noise signal, receiving echo mutually correlation processing, the determination of the maximum correlation response, determining speed and distance of located object, determine the mean value of the frequency emitted F_em probing signal, signal reception is carried out with a static fan of directional characteristics crossing at a level of not less than 0.7 of the maximum, a set of temporal realizations of the echo signal with duration T is carried out simultaneously on all characteristics of directivity, correlation coefficient between time implementations of successive adjacent spatial channels is determined, pairs of adjacent spatial channels are selected, between which correlation coefficient exceeds 0.5, selecting a pair of channels with a maximum correlation coefficient, determining a cross-correlation function between channels of the selected pair, determining a maximum of the cross-correlation function, determining the time position of the selected maximum and its amplitude, determining the area of positive readings of the maximum of the correlation function, determining the zone of negative readings before the beginning of the zone of positive readings and the zone of negative readings after the zone of positive readings, boundary readings having different polarity are determined, the period of the carrying autocorrelation function is measured and the carrier frequency of the received echo signal is determined, after which the radial velocity is determined.

EFFECT: proposed method allows to reduce processing time of a pseudo-noise signal and to increase its efficiency when used in sonar for detecting objects and measuring parameters.

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