Investigation on Spectral Aliasing Error Resulted from Truncating Signals Incoherently

Abstract:

The aliasing error resulted from truncating signals incoherently is one of main spectrum errors. The investigation on the error remains quite limited. This restricted the development of high accuracy spectrum analysis. This work discussed the truncation effect and the corresponding aliasing error in quantity, and revealed its dependence upon the truncation conditions. Then a concise technique was proposed to suppress the truncation aliasing error of DFT spectrum by modifying the first datum of the digital signal in time domain. Under general truncation conditions, the simulations show that the error correction of the 5 spectral lines near the main lobe is effective and the maximum absolute error of the main spectral line is decreased from ±2.4‰ to ±0.5‰.

• Periodical: Applied Mechanics and Materials (Volumes 568-570)
• Pages: 208-211
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.568-570.208
• Online since: June 2014
• Authors: Hui Zhang, Feng Han*, Xiao Yan Bao, Hua Yao Mao
• Keywords: DFT, Harmonic Analysis, Spectral Error, Truncation Aliasing Error

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