Sine-Wave Amplitude Estimation by a Two-Point Interpolated DFT Method Robust to Spectral Interference from the Image Component

Daniel Belega, Dominique Dallet, Dario Petri

Abstract

This paper proposes a new two-point Interpolated Discrete Fourier Transform (IpDFT) method for the amplitude estimation of a sine-wave with high rejection capability of the spectral interference from the image component. The method is based on the Maximum Sidelobe Decay (MSD) windows. The analytical expression of both the proposed amplitude estimator and its variance due to additive white noise are derived. Computer simulations and experimental results show that the proposed estimator outperforms both the classical IpDFT and the three-point IpDFT methods when the number of acquired sine-wave cycles is small.

Keywords

Amplitude estimation; multipoint interpolated DFT method; non-coherent sampling; spectral interference; statistical analysis.

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IMEKO-TC4-2014-374.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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