Get Acoustic Signal Processing for Ocean Exploration PDF

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

ISBN-10: 9401046999

ISBN-13: 9789401046992

ISBN-10: 9401116040

ISBN-13: 9789401116046

Acoustic sign Processing for Ocean Explortion has significant targets: (i) to provide sign processing algorithms that take into consideration the versions of acoustic propagation within the ocean and; (ii) to provide a point of view of the vast set of options, difficulties, and functions coming up in ocean exploration.
The e-book discusses comparable matters and difficulties centred in version dependent acoustic sign processing equipment. in addition to addressing the matter of the propagation of acoustics within the ocean, it offers correct acoustic sign processing tools like matched box processing, array processing, and localization and detection suggestions. those extra conventional contexts are herein enlarged to incorporate imaging and mapping, and new sign illustration types like time/frequency and wavelet transforms. a number of utilized elements of those issues, reminiscent of the appliance of acoustics to fisheries, sea flooring swath mapping through swath bathymetry and part test sonar, self sustaining underwater cars and communications in underwater also are considered.

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11 we note that this can will only occur in very special cases where a relative thin sedimentary layer is overlying a very hard rock. Note also that this effect is not dependent on the sediment layer to have any rigidity. The conditions necessary for this effect to occur are found by solving the dispersion equations for a range of parameter values and see if a valid solution results. An example of such analysis is shown in Fig. 12 where all the parameters are the same as given for Fig. 5Vp2 is kept constant.

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....

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. In a similar manner there are frequency bands of high transmission loss due to (!. shear waveguide effect when the layer has some rigidity. The high losses occur for frequencies where the thickness of the layer is an odd multiple of the shear wavelength and, at the same time, the layer thickness is less than about one compressional wavelength.

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Acoustic Signal Processing for Ocean Exploration by Finn B. Jensen (auth.), José M. F. Moura, Isabel M. G. Lourtie (eds.)

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