FIELD: physics.
SUBSTANCE: signal under analysis is fed to a selective filter bank; signal power is measured at the filter outputs; before measurement, the range of controlled frequencies is broken down to resolution elements; values of complex transfer constants of filters in all resolution elements are determined; weight coefficients 
are determined, where Hik is the complex transfer constant of the i-th filter in the k-th resolution element, Ω is the size of the resolution element, ωk is the frequency from the k-th resolution element; a weight matrix v(t) is formed therefrom; at a certain moment in time t, signal power values at the filter outputs are measured and the merged into a vector p(t); an auxiliary vector z is determined from the measurement equation p(t)=vT(t)z or, if there is need to take measurement error into account, from the equation p(t)=vT(t)z+n(t), where n(t) is the measurement error vector; from the component of the obtained vector 
where ∧ denotes an estimate of the corresponding value, a matrix 
is formed, where 
from the first column of the matrix Q, the complex spectrum of the analysed signal is determined with accuracy of the resolution element in form of a vector 
EFFECT: high accuracy.
1 dwg
