23rd IMEKO TC 4 International Symposium and the 5th Chinese Conference on Electromagnetic Metrology Technical (IMEKO TC4 2019)

162 / 2019-03-15 21:24:25

Contribution of Interharmonic Component on the Interpolated DFT Frequency Estimator

Error analysis, Frequency estimation, Interharmonic component, Interpolated DFT algorithm, Windowing.

Plenary track > Waveform Analysis and Measurements

This paper investigates the contribution on the sine-wave frequency estimation returned by the interpolated discrete Fourier transform (IpDFT) algorithm due to a small amplitude interharmonic component located more than one bin apart the fundamental component. An analytical expression for the frequency estimation error is derived assuming that a maximum sidelobe decay (MSD) window is employed and its accuracy is verified through computer simulations. Based on the derived expression some useful remarks are finally drawn.