SONAR METHOD FOR OBJECT CLASSIFICATION Russian patent published in 2023 - IPC G01S15/00 

FIELD: hydroacoustics.

SUBSTANCE: invention relates to the field of hydroacoustics and can be used to build systems for automatic detection of echo signals received by a sonar against the background of noise and reverberation interference, and its classification using pseudo-noise signals. To ensure the effect, a method for classifying objects is proposed, containing the emission of a probing pseudo-noise signal, receiving an echo signal, performing optimal multi-channel correlation processing, including measuring interference, measuring the amplitude of correlation functions, choosing a correlation function with a maximum amplitude A_max, determining the time position T_Amax of the maximum correlation function, the result of cross-correlation processing with the maximum amplitude Amax and the realization of the input signal before processing in a wide band are simultaneously compared, Т_Amax is taken for the end time of the received signal at the input current, the average value of the interference A_int and the threshold in a wide band are determined, the amplitudes of temporary realizations are measured sequentially in time in a wide frequency band that exceeded the threshold, the time position of the amplitude of the first realization that exceeded the threshold T_in is determined, the time position of the final amplitude that exceeded the threshold T_fin is determined, and the difference (T_in - T_fin) is determined, while if (T_in - T_fin)>2T_sig, where Tsig is the duration of the probing signal, the difference (T_in - T_ok) is determined, and if (T_in – T_ok)>0.1T_sig, it is decided that the target is surface, if (T_in – T_ok)> 0.1T_sig, it is decided that the target is underwater.

EFFECT: expansion of the list of classified objects.

1 cl, 1 dwg