METHOD FOR TIME-FREQUENCY CORRELATION ANALYSIS OF DIGITAL SIGNALS

摘要

FIELD: physics.;SUBSTANCE: values are selected from the resultant signal of the product of results of direct Fourier transformation of a first signal and complex conjugate values of results of direct Fourier transformation of a second signal P_j and signals M^k, j=0,1,…,2^n-1+1; m=2,3,…,2^n-1+1; k = 0,1,…, m-1 are formed in accordance with the expression The obtained M^k signals undergo inverse Fourier transformation Z^k = F^-1[M^k]. A frequency-time correlation function where t_i∈[t_min, t_max]; f_k∈[f_min, f_max]; f_d is sampling frequency of the signal is determined from results of inverse Fourier transformation. A curve of the frequency-time correlation function r_l2(f,t) is plotted using the obtained results, from which correlation of harmonic components of signals at different frequencies is determined.;EFFECT: broader functional capabilities of analysing correlation of signals in the frequency domain.;4 dwg, 1 tbl