Frequency estimation for densely intervaled components based on all-phase filtering

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (4) : 77-82.

YANG Jundong1，YU Jiang1，HUANG Ming1，ZHANG Guo2，GE Fuhua1

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Abstract

To enhance the frequency estimation accuracy for densely-intervaled components,this paper proposed an all-phase filtering based spectrum correction method.Firstly，a factor reflecting the phase linearity deviation of 3 spectral lines centered with the spectral peak was constructed,which can identify whether dense components exist around the frequency position of interest.Secondly,substituting this frequency component into the analytic formula of all-phase narrow-band filter yields all the filter tap coefficients.Lastly,the estimation results were acquired by implementing an existing spectrum correction operation (such as the ratio correction) on the effective sample segment of the all-phase filter’s output.Numerical results show that,the proposed estimator can greatly remove the inter-spectra interference errors and thus achieves a higher accuracy than the existing spectrum method,which possesses a vast potential of applied prospects.

Key words

Frequency estimation / All-phase filtering / inter-spectra interference / analytic formula

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YANG Jundong1，YU Jiang1，HUANG Ming1，ZHANG Guo2，GE Fuhua1. Frequency estimation for densely intervaled components based on all-phase filtering[J]. Journal of Vibration and Shock, 2019, 38(4): 77-82

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