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Anti-aliasing nonstationary signals detecion algorithm based on interpolation in the frequency domain using the short time Fourier transform

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2 Author(s)
Bian Hailong ; CAT Lab, School of Automation Engineering, Univ. of Electronic Science and Technology, Chengdu 610054, P. R. China ; Chen Guangju

To eliminate the aliasing that appeared during the measurement of multi-components nonstationary signals, a novel kind of anti-aliasing algorithm based on the short time Fourier transform (STFT) is brought forward. First the physical essence of aliasing that occurs is analyzed; second the interpolation algorithm model is setup based on the Hamming window; then the fast implementation of the algorithm using the Newton iteration method is given. Using the numerical simulation the feasibility of algorithm is validated. Finally, the electrical circuit experiment shows the practicality of the algorithm in the electrical engineering.

Published in:

Journal of Systems Engineering and Electronics  (Volume:19 ,  Issue: 3 )