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 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 signals 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.
bispectrum detector target detection Gaussianity test frequency domain
Guangjin He Jinfang Cheng Wei Zhang
Department of Weaponry Engineering,Naval University of Engineering,430033 Wuhan,China
国际会议
沈阳
英文
1761-1765
2012-09-07（万方平台首次上网日期，不代表论文的发表时间）