TY - JOUR
N2 - To improve the estimation of active power, the possibility of estimating the amplitude square of a signal component using the interpolation of the squared amplitude discrete Fourier transform (DFT) coefficients is presented. As with an energy-based approach, the amplitude square can be estimated with the squared amplitude DFT coefficients around the component peak and a suitable interpolation algorithm. The use of the Hann window, for which the frequency spectrum is well known, and the three largest local amplitude DFT coefficients gives lower systematic errors in squared interpolated approach or in better interpolated squared approach than the energy-based approach, although the frequency has to be estimated in the first step. All investigated algorithms have almost the same noise propagation and the standard deviations are about two times larger than the Cramér-Rao lower bound.
L1 - http://sd.czasopisma.pan.pl/Content/89823/PDF/Journal10178-VolumeXVIII+Issue4_06paper.pdf
L2 - http://sd.czasopisma.pan.pl/Content/89823
PY - 2011
IS - No 4
EP - 583-596
KW - estimation
KW - amplitude square
KW - spectral data processing
KW - interpolated DFT
KW - Hann window
A1 - Lušin, Tomaž
A1 - Agrež, Dušan
PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation
SP - 583-596
T1 - Estimation of the Amplitude Square Using the Interpolated Discrete Fourier Transform
DA - 2011
UR - http://sd.czasopisma.pan.pl/dlibra/publication/edition/89823
T2 - Metrology and Measurement Systems
DOI - 10.2478/v10178-011-0056-6
ER -