METHOD OF PROCESSING SONAR ECHO SIGNAL Russian patent published in 2014 - IPC G01S15/00 

FIELD: physics.

SUBSTANCE: method includes emitting a probing signal, receiving an echo signal with a static characteristic sheaf; selecting a time realisation successively all spatial channels; processing successively on all spatial channels; determining the noise level as a result of summation of all readings in the first reception cycle on all spatial channels; calculating the detection threshold based on the average value of all readings Asr; selecting the minimum value in each set of time readings of the envelope successively on all spatial channels according to the rule 0≤Amin<Asr; storing the number of the spatial channels in which minimum values of envelopes are detected; selecting the maximum reading Amax in each set of readings of the envelope on all spatial channels; cutting, while leaving the minimum reading according to the rule, n successive readings; selecting the least, and the maximum reading according to the rule; from n successive readings, selecting the maximum in each set of time readings of the envelope on all spatial channels; automatic detection of echo signals exceeding the selected detection threshold Amax>Aporog=kAsr successively on all spatial channels of the static sheaf of the beam pattern; measuring and storing the amplitudes and numbers of readings of signals exceeding the detection threshold; measuring and storing the numbers of spatial channels in which a signal was detected; measuring the angular length UP max of the object from the number of spatial channels exceeding the detection threshold; determining the numbers of readings and spatial channels in which the selected threshold was not exceeded and in which the signal level is close to 0; determining the angular length UPmin of the region of minimum readings from the number of spatial channels in which 0≤Amin<Asr, and determining presence of a shadow of the object if the angular lengths match.

EFFECT: high information value of input information by selecting shadowgraphic features of an echo signal from an object.

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