吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (2): 653-657.doi: 10.13229/j.cnki.jdxbgxb201502047

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New frequency estimation method for harmonic signal submerged in complex noise background

SUN Xiao-dong,QUAN Ai-juan, LI Yong   

  1. College of Communication Engineering, Jilin University,Changchun 130022,China
  • Received:2013-06-25 Online:2015-04-01 Published:2015-04-01

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Abstract: A new frequency estimation method for harmonic signals embedded in strong chaotic interference is proposed. This method is based on the frequency doubling, wavelet packet theory and cross spectrum theory, and it is composed of three steps. First, using the cycle characteristic of harmonic, the sampling data are equidistantly taken value of the harmonic signals and then construct a new data sequence. The doubling harmonic is deviated from the chaotic centre frequency. Second, the wavelet packet decomposition algorithm is applied to analyze the energy distribution characteristics of the harmonic signals and chaotic signals. Finally, according to the results of second step, the components, on which the harmonic signal energy concentrates, are extracted, then, the cross spectrum method is applied to estimate the frequencies of the harmonic signals. Simulation results demonstrate the effectiveness of the proposed method.

Key words: information processing technology, frequency estimation , chaos signal, frequency doubling, wavelet packet theory , cross spectrum

CLC Number: 

  • TN911.71
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