Contribution of Interharmonic Component on the Interpolated DFT Frequency Estimator

Daniel Belega, Dario Petri, Dominique Dallet

Abstract

This paper investigates the contribution to the sine-wave frequency estimator returned by the interpolated discrete Fourier transform (IpDFT) algorithm of a small amplitude interharmonic component located at least one bin apart the unknown frequency. 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.

Keywords

error analysis, frequency estimation, interharmonic component, interpolated DFT algorithm, windowing

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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