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http://dx.doi.org/10.5370/JEET.2012.7.2.163

Parameter Estimation Method of Low-Frequency Oscillating Signals Using Discrete Fourier Transforms  

Choi, Joon-Ho (Dept. of Elec. Eng., Chonnam National University)
Shim, Kwan-Shik (Dept. of Elec. Eng., Chonnam National University)
Nam, Hae-Kon (Dept. of Elec. Eng., Chonnam National University)
Lim, Young-Chul (Dept. of Elec. Eng., Chonnam National University)
Nam, Soon-Ryul (Dept. of Elec. Eng., Myongji University)
Publication Information
Journal of Electrical Engineering and Technology / v.7, no.2, 2012 , pp. 163-170 More about this Journal
Abstract
This paper presents a DFT (Discrete Fourier Transform) based estimation algorithm for the parameters of a low-frequency oscillating signal. The proposed method estimates the parameters, i.e., the frequency, the damping factor, the mode amplitude, and the phase, by fitting a discrete Fourier spectrum with an exponentially damped cosine function. Parameter estimation algorithms that consider the spectrum leakage of the discrete Fourier spectrum are introduced. The multi-domain mode test functions are tested in order to verify the accuracy and efficiency of the proposed method. The results show that the proposed algorithms are highly applicable to the practical computation of low-frequency parameter estimations based on DFTs.
Keywords
Discrete Fourier transform; Fourier spectrum; Time series signal; Low-frequency; Parameter estimation;
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