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Karl-Walter Bonfig, Zhongdong Liu, Jörg Himmel

Improved Phase-Difference Method for the Frequency Estimation of Noisy Signals in Short Measurement Time

Keywords: DFT, FFT, frequency measurement, leakage effect, phase-difference method

In this paper the phase-difference method is investigated for the frequency estimation of a noisy signal. It is shown that frequency outliers appear in the application of the phase-difference method even though the signal-to-noise ratios are high. The origin of the frequency outliers are analysed statistically. For the correction of the frequency outlier a discriminant is proposed. Compared with other common methods, the improved phase-difference method can estimate the frequency of noisy signals with higher accuracy and moderate computational complexity.

tm – Technisches Messen, Oldenbourg Wissenschaftsverlag

Print ISSN: 0171-8096
Volume: 72, 12/2005
Pages: 679 - 692

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