Application of interference suppression gate in line spectrum extraction

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (23) : 253-258.

NIU Fang1, 2, 3, HUI Juan1, 2, 3, ZHAO Anbang1, 2, 3, 4

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Abstract

Due to complexity of ship radiated noise and marine environment noise, it is difficult to directly extract line spectra from demodulated signals of ship radiated noise.Here, an interference suppression gate was designed to suppress broadband noise interference in line spectrum extraction.Simulations for single-frequency input signal and harmonic input one verified the effectiveness of the suppression algorithm.Moreover, statistical analysis was performed for the output signal to noise ratio (SNR) gain of the interference suppression gate.The processing results of actual ship radiated noise data showed that application of interference suppression gate can effectively reduce broadband noise interference, and provide convenience for line spectrum extraction; the extracted propeller shaft frequency can be taken as a feature quantity for ship target classification and recognition; the interference suppression gate algorithm can also be applied in line spectrum detection.

Key words

interference suppression gate / line spectrum extraction / shaft frequency / ship radiated noise

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NIU Fang1, 2, 3, HUI Juan1, 2, 3, ZHAO Anbang1, 2, 3, 4. Application of interference suppression gate in line spectrum extraction[J]. Journal of Vibration and Shock, 2019, 38(23): 253-258

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