By Finn B. Jensen (auth.), José M. F. Moura, Isabel M. G. Lourtie (eds.)

*Acoustic sign Processing for Ocean Explortion* has significant ambitions: (i) to offer sign processing algorithms that keep in mind the types of acoustic propagation within the ocean and; (ii) to provide a point of view of the vast set of suggestions, difficulties, and purposes bobbing up in ocean exploration.

The booklet discusses similar matters and difficulties targeted in version established acoustic sign processing equipment. in addition to addressing the matter of the propagation of acoustics within the ocean, it offers proper acoustic sign processing tools like matched box processing, array processing, and localization and detection ideas. those extra conventional contexts are herein enlarged to incorporate imaging and mapping, and new sign illustration versions like time/frequency and wavelet transforms. numerous utilized elements of those subject matters, akin to the applying of acoustics to fisheries, sea flooring swath mapping through swath bathymetry and facet test sonar, self sufficient underwater cars and communications in underwater also are considered.

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Occur with a layered bottom. Thus we have found that when the velocity in the surface layer is lower than the velocity in the water, a particular strong reflection loss will occur at zero grazing angle certain narrow frequency bands. We have associated this mechanism with a compressional waveguide effect and determined the relationship between the bottom parameters and the frequency for the high losses. It is easy to generalize to the situation with any low velocity layer in a multi-layered bottom.

This effect was first discused by Vidmar [11,12] and later by Hughes et al. [13]. 36 In principle the dispersion equation for the shear waveguide can be established in the same manner as for the compressional waveguide but in practice this is very difficult and requires extensive algebraic manipulations. A very simplified result is obtained by considering the sedimentary layer bounded between vacuum and an infinite hard solid. Assuming only shear waves in the layer and neglecting shear-to -compressional wave conversion, we obtain the simple dispersion equation (17) When the shear velocity in the sediment layer is much smaller than the sound velocity in the water, the shear waves propagate nearly vertically and the solutions of the dispersion equation becomes, with m = 1,2,3....

37 (1965) 19-27. D. Tappert, The parabolic approximation method, in: Wave Propagation and Underwater Acoustics, eds. B. S. Papadakis (Springer-Verlag, New York, NY, 1977) pp. 224-28,1. R. Chapman, A wide-angle split-step algorithm for the parabolic equation, J. Acoust. Soc. Amer. 74 (1983) 1848-1854. [22] D. Lee and G. Botseas, IFD: An implicit finite-difference computer model for solving the parabolic equation, Rep. TR-6659 (Naval Underwater Systems Center, New London, CT, 1982). D. Collins, A higher-order parabolic equation for wave propagation in an ocean overlying an elastic bottom, J.