METHOD FOR PROCESSING SHORT-TERM NON-STATIONARY RANDOM NOISE EMISSION PROCESS Russian patent published in 2023 - IPC G01S3/80 

FIELD: hydroacoustics.

SUBSTANCE: method for processing a noise emission signal from an object, comprising receiving a time sequence of a noise emission signal by an antenna with a static fan of directional characteristics, sampling the received time sequence, a set of samples of the time sequence for all directional characteristics, presenting the result to an indicator, in which the duration of the set of time sequence of the signal is determined by the upper frequency, the signal is processed in the low-frequency range, for each time set the average value of the amplitude A_avg of all signals of all spatial channels is determined, a threshold equal to KA_avg is determined, the channels in which the threshold was exceeded are determined, and if the number of channels is more than 4, the correlation coefficients between temporary sets of adjacent spatial channels from among those in which the threshold was exceeded, and between successive temporary implementations of each spatial channel, and with a correlation coefficient less than 0.5, record the time of measurement of the correlation coefficient as the beginning of a non-stationary process T_n, with a decrease signal below KA_avg, remember the end time of the non-stationary process T_k, determine the time interval ΔT=T_k-T_n, and decide that there is an emergency change in the stationarity of the situation at time T _n atΔ T>T_time, where T_time is the time interval determined for the specific sources of non-stationary short-term noise emission processes.

EFFECT: determination of changes in stationarity of the noise process at the input of the receiving device when receiving a noise emission signal.

1 cl, 1 dwg