Improvement and Anti-Noise Performance Analysis of Window-Length Changing Phase Difference Correction

Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (10): 210-213.

• Electronics, Communication & Automation Technology • Previous Articles Next Articles

Improvement and Anti-Noise Performance Analysis of Window-Length Changing Phase Difference Correction

Ding Kang Yang Zhi-jian

School of Automotive Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China

Received:2007-03-01 Online:2007-10-25 Published:2007-10-25
Contact: 丁康(1957-) ，男，教授，博士生导师，主要从事机械振动信号处理与故障诊断等研究. E-mail:kding@scut. edu. cn
About author:丁康(1957-) ，男，教授，博士生导师，主要从事机械振动信号处理与故障诊断等研究.
Supported by:
国家自然科学基金资助项目(50475095)

Abstract

Abstract:

This paper presents a method of improved winodw-length changing phase difference correction to estimate the frequency of harmonic signal. As compared with the unimproved one , the proposed method only needs to perform one fast Fourier transelation (FFT) and one single-point discrete Fourier translation (DET). Thus，the pro-cessing speed is greatly increased. The anti-noise performance of the improved method is also investigated in thispaper , and the variance equation of the frequency estimation error in the presence of Gaussian white noise is then deduced. Simulation is finally performed to verify the correctness of the variance equation. The results reveal the good anti-noise capability of the improved method.

Key words: frequency estimation, phase difference, anti -noise, spectrum analysis, correction

Ding Kang Yang Zhi-jian. Improvement and Anti-Noise Performance Analysis of Window-Length Changing Phase Difference Correction[J]. Journal of South China University of Technology (Natural Science Edition), 2007, 35(10): 210-213.

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Improvement and Anti-Noise Performance Analysis of Window-Length Changing Phase Difference Correction

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