SONAR METHOD OF OBJECT DETECTION AND MEASUREMENT OF PARAMETERS THEREOF Russian patent published in 2018 - IPC G01S15/00 

FIELD: hydro acoustics.

SUBSTANCE: invention relates to the field of hydroacoustics, and the method for detecting an object and measuring the parameters comprises the radiation of a sounding complex signal of time T and a band F at time trad, forming M-reference signals, their central frequency is shifted in frequency relative to the radiated signal by an amount K, the reception of the echo signal, the determination of M correlation functions between the echo signal and each of the M-reference signals, the measurement of the amplitude of the correlation functions, the choice of the correlation function with the maximum amplitude Amax, the determination of the temporal position of the maximum of the correlation function tmax for determining the distance from the formula D=0.5S(tmax-trad), where S is the speed of sound, the determination of the reference signal number M_tmax to determine the speed V_tmax, the display of the result on the indicator, the magnitude of the shift in frequency K does not exceed 0.5/T, determine the extreme number of the reference channel of a symmetric M_tmax with respect to the radiation frequency, and in this channel the maximum value of the emission of the correlation function Athr is determined, and if Amax>2Athr, the amplitudes of all the emissions of the correlation function of the channel with Amax, the value of which exceeds 0.5 Amax, determine the time position of each ejection t_i, determine the difference between the outermost emissions and the length of the echo signal L=0.5S(t₁-t_n), where t₁ – the first ejection of the correlation function, which exceeded the threshold, t_n – the last release of the correlation function that exceeds the threshold determines the number of emissions that exceed threshold N, and determine the target class in terms of speed, extent and number of emissions.

EFFECT: invention can be used to build systems for automatic detection of echoes received by the sonar against a background of noise and reverberation interference.

1 cl, 1 dwg