The Research on Bispectrum Detection of Underwater Target in Frequency Domain

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 o...

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Bibliographic Details
Published inApplied Mechanics and Materials Vol. 182-183; pp. 1761 - 1765
Main Authors Zhang, Wei, He, Guang Jin, Cheng, Jin Fang
Format Journal Article
LanguageEnglish
Published Zurich Trans Tech Publications Ltd 01.06.2012
Subjects
Target Detection
Frequency Domain
Gaussianity Test
Bispectrum Detector
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Summary: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.
Bibliography:Selected, peer reviewed papers from the 2012 International Applied Mechanics, Mechatronics Automation Symposium (IAMMAS 2012), September 7-9, 2012, Shenyang, Liaoning, China
ISBN:303785426X
9783037854266
ISSN:1660-9336
1662-7482
1662-7482
DOI:10.4028/www.scientific.net/AMM.182-183.1761