The Research on Bispectrum Detection of Underwater Target in Frequency Domain

Guang Jin He; Jin Fang Cheng; Wei Zhang

doi:10.4028/www.scientific.net/AMM.182-183.1761

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 182-183The Research on Bispectrum Detection of Underwater...

The Research on Bispectrum Detection of Underwater Target in Frequency Domain

Abstract:

As the non-Gaussianity of ship-radiated noise reduces fast when the Signal-to-Noise Ratio (SNR) becomes low, a bispectrum detector in the frequency domain is proposed to ease the problem. First, FFT method is applied on the received data to calculate the power spectrum. Second, the non-Gaussianity of the power spectrum series is tested by Hinich-Wilson Gaussian Test rule. Last, the bispectrum detector based on non-Gaussianity is used to determine whether there are ship-radiated signals. The bispectrum detector in frequency domain is applied to detect simulated noise and real ship-radiated noise. The results are compared with the detector which is in the signal’s time domain. The comparison illustrates that the bispectrum detector based on the power spectrum series(in frequency domain) is much better in detecting low SNR signals, which is very valuable in far distance detection.

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Periodical:

Applied Mechanics and Materials (Volumes 182-183)

Pages:

1761-1765

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.182-183.1761

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Online since:

June 2012

Authors:

Guang Jin He, Jin Fang Cheng, Wei Zhang

Keywords:

Bispectrum Detector, Frequency Domain, Gaussianity Test, Target Detection

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