Abstract
The bispectrum of ship-radiated noise is estimated. The noise was received on a towed array being towed by the same ship that served as the noise source. The array was beamformed such that the forward end-fire beam pointed toward the towing platform and the broadside beam sampled the environment without the radiated noise of the ship. The results show that there exist frequency-dependent bispectral components in the ship's radiated noise, whereas the ambient noise does not contain any significant bispectral components. Since the existence of a nonzero frequency-dependent bispectrum indicates the existence of nonlinear components in the noise-generating mechanism, it is concluded that the radiated noise of the towing platform contains such nonlinear mechanisms. Also, the bispectrum has the capability of indicating the presence of transients in the data. This property will be briefly discussed, and it will be shown that the data under analysis contain transients. Based on these results, it is concluded that the bispectrum could be used to indicate the existence of transient and nonlinear sources that would normally be hidden in the background noise when the usual spectral estimation procedures are applied.
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