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Tow ship noise is a typical multi-path directional interference, and the receiving response of which on towed line array is worthy of in-depth study. Firstly, the sea trial data was analyzed to summarize the tow ship noise characteristics. Then the underwater acoustic field of tow ship noise was modeled to achieve the power distribution of the noise. Finally an important result was obtained, that...
Tow ship noise is a typical directional interference for towed line array sonar, nonstationary process with several characteristic properties, such as multi-path and angle dispersion, which greatly add the difficulty to cancel or suppress the noise. Empirical Mode Decomposition (EMD) is a novel method used for processing nonlinear and nonstationary signals. Finite Intrinsic Mode Functions (IMFs) are...
A novel method for the canceling of directional interferences was presented. Tow ship noise is a typical directional interference when towed sonar works, which has bothered sonar researchers for years. Inverse beamforming is a novel method for the canceling of directional interference, but it has its limitation to cancel tow ship noise just because of its multi-path propagation characteristic. Based...
A novel algorithm for the canceling of broadband multi-path interference was presented, namely IBF-ANC (Inverse Beamforming & Adaptive Noise Canceling) combined algorithm. The interference was reconstructed by IBF and used to be the reference at the input end of adaptive noise canceller, which overcame the defect of ANC algorithm. As many practical experiences showed that it was very difficult...
Direction of arrival (DOA) estimation of narrowband wavefronts impinging on an array of sensors has long been of great research interest. In this paper, it is shown that for a uniform linear array (ULA), discrete Fourier transform (DFT) domain-based DOA estimation rely on knowledge of the power spectral density (PSD). We present a novel approach for signal tracking, which updates the signal PSD for...
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