METHOD FOR DETECTING NOISY MARINE OBJECTS Russian patent published in 2022 - IPC G01S3/80 

FIELD: acoustics.

SUBSTANCE: area of application: invention relates to the field of hydroacoustics and can be used in listening direction finding systems. Method includes receiving the primary noise emission field of the objects by a multi-element antenna array with a static fan of pattern characteristics (fan of observation channels); determining the correlation of the formed observation channels with the signal of one pre-selected receiving element of the multi-element antenna array (reference channel) ensuring the reception of signals from all directions in the set coverage area; calculating the weighing coefficients for each channel and forming cleaned channels by rejecting the signal from said reference channel; performing time-frequency processing in each initial spatial observation channel and in each cleaned channel; centring and normalising the output effects of the initial and cleaned spatial channels to the distributed interference, thereby obtaining arrays of initial and cleaned indicator processes; comparing the array of initial indicator processes with the preset threshold for detecting strong interfering local interference signal; and when said signal is exceeded in at least one spatial channel, i.e., when a local interference signal is detected, making a decision on the detection of noisy marine objects based on the outputs of cleaned indicator processes.

EFFECT: increase in the reliability of detecting weak noise emission objects and prolonged contact maintained with the noisy marine object by partially suppressing strong interfering local interference signals in an additive mix of useful signal, noise, and local interference over the entire coverage area, without an operator's assistance, while the resource requirements are significantly reduced compared to known technical solutions.

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