METHOD OF RECOGNITION OF MATERIALS OF ACOUSTICAL OBJECTS Russian patent published in 2017 - IPC G01S15/88 

FIELD: physics.

SUBSTANCE: in this invention the possible resonant frequency range of oscillations of the irradiated target is defined, for example, by calculation based on the known dimensions of the target with a predetermined accuracy or radiation probe pulse with high resolution on the location range reflecting elements target in the direction of irradiation and measurement times and reflected pulses angles of arrival emit wideband sounding pulses corresponding to one or more specific areas of a resonant vibrational frequency in the frequency bandwidth rd irradiated target, receiving a reflected signal, determine the spectrum of this signal, the spectrum is isolated substantial local maxima and measured their amplitude and width of the resonance frequency region by the level of 0.707 of the maximum amplitude in each resonant region of the spectrum of the reflected signal, the Q-factors in the resonant frequency regions are calculated by the ratio of the maximum amplitude in the resonance region of the signal spectrum to the measured bandwidth of the frequency domain and the material of the acoustic target is determined for the identified Q-values based on the decision rule formulated as a result of the analysis of the static characteristics of the change in the Q of the known materials, for example, based on the Bayes criterion.

EFFECT: expansion of the range of recognizable materials of acoustic targets and increase of noise immunity of recognition.

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