An improvement of the nonparametric frequency estimation below two signal periods using two windowsBegeš, Gaber (Avtor) Agrež, Dušan (Avtor) Hudoklin, Domen (Avtor) discrete Fourier transform (DFT) coefficientsfrequencyinterpolationmaximum sidelobes decay (MSD) windowsnonparametric estimationspectral distortionThis article presents a method for improving the nonparametric frequency estimation of the fundamental periodicity of a multifrequency signal when a smaller number of periods are covered—up to two periods in the measurement time. The estimation procedure uses the weights of two Rife-Vincent I (RV1) windows on the same set of acquired signal samples and then uses a combination of two consecutive discrete Fourier transform (DFT) amplitude coefficients in the quotient. To reduce the harmonic influence, the technique of near-coherent frequency evaluation is used, and to reduce the interharmonic influence, a method can be added, where the rest of the signal is averaged after determining the periodic part of the signal. The simulation and experimental results obtained show a very good compromise between fast and accurate estimation.20242025-09-18 12:37:53Članek v reviji173576sl