Direct analysis of non-quadratic phase coupling for detection of linearly modulated signals

Fidel Hernández and Aitzol Iturrospe
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phmc_15_048.pdf705.02 KBAugust 24, 2015 - 8:13am

The detection of a linearly modulated signal is currently accomplished by applying the Bispectrum. This technique is capable of detecting quadratic phase coupled spectral components, and consequently, can be used in order to reveal a linearly modulated signal presence. However, a linear modulation by itself does not exhibit quadratic phase coupled spectral analysis. Then, the application of the Bispectrum for detecting linearly modulated signals could be unsuccessful. In this paper a general method for detection of linearly modulated signals, which can be applied whether the signals comprise quadratic phase coupled spectral components or not, is proposed. This method is evaluated through numerical simulations and it is applied for detecting a local fault in rolling element bearings. The achieved results are compared with those obtained by the traditional spectral analysis and the Bispectrum, revealing the effectiveness obtained by the application of the proposed method.

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Data-driven methods for fault detection, diagnosis, and prognosis
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