Single channel blind source separation adaptive filtering amplitude correction method for telemetry vibration signals

XIAO Ying1, MA Yiwei 1, LIU Xue2

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (23) : 127-133.

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PDF(1022 KB)
Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (23) : 127-133.

Single channel blind source separation adaptive filtering amplitude correction method for telemetry vibration signals

  • XIAO Ying1, MA Yiwei 1, LIU Xue2
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Abstract

To solve the amplitude uncertainty problem of single channel blind source separation based on empirical mode decomposition (EMD) and independent component analysis (ICA), an adaptive filtering amplitude correction method was proposed. The single channel signal is decomposed into a series of intrinsic mode function (IMF) by EMD, and the number of independent components contained in the single channel signal is determined according to the marginal spectrum distribution in logarithmic coordinate. The corresponding IMF is selected as the observed signal component and blind source separation can be implemented by ICA. The order of the transversal filter is determined according to the number of separated signals, and the separated signal is used as the input signal component of the filter. The objective function of adaptive filtering is designed with the filter output and the original single channel signal, and the filter weights are adaptively adjusted to obtain convergence. The filter weights after the algorithm convergence are the amplitude correction coefficients of the corresponding separated signal components. The results of simulation and flight vehicle test telemetry vibration signal process show that the proposed method can obtain the accurate energy information of each component of the signal, which provides an effective technical way for energy detection in time-domain statistics and time-frequency analysis of telemetry vibration signals.

Key words

flight vehicle test / vibration signal / empirical mode decomposition (EMD) / blind source separation / adaptive filtering

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XIAO Ying1, MA Yiwei 1, LIU Xue2. Single channel blind source separation adaptive filtering amplitude correction method for telemetry vibration signals[J]. Journal of Vibration and Shock, 2021, 40(23): 127-133

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