By Finn B. Jensen (auth.), José M. F. Moura, Isabel M. G. Lourtie (eds.)
Acoustic sign Processing for Ocean Explortion has significant objectives: (i) to offer sign processing algorithms that bear in mind the types of acoustic propagation within the ocean and; (ii) to offer a standpoint of the extensive set of strategies, difficulties, and purposes coming up in ocean exploration.
The ebook discusses comparable concerns and difficulties centred in version dependent acoustic sign processing equipment. along with addressing the matter of the propagation of acoustics within the ocean, it offers correct acoustic sign processing equipment 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 features of those themes, reminiscent of the appliance of acoustics to fisheries, sea flooring swath mapping through swath bathymetry and aspect experiment sonar, self reliant underwater cars and communications in underwater also are considered.
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Additional resources for Acoustic Signal Processing for Ocean Exploration
The reflection coefficient for this 28 -6 til ...... 0 . 0 . 0 Fig. 7. Reflection loss as function of frequency and grazing angle for the slow sedimentary layer model. 4) and Tl2 is the reflection coefficient for a plane wave at the interface between the layer and the subbottom. 1. LOW VELOCITY FLUID LAYER. The compressional wave velocity in the layer is assumed to be lower than the compressional wave velocities of both the water and the subbottom and therefore the layer constitutes a waveguide.
The remaining high losses in Fig. 14b are caused by the interface wave effect since the condition, discussed in the preceding section, is satisfied with the parameters used in this example. An examination of the positions of the peak loss due to shear resonance, which are predicted very well by Eq. 17, discloses that they occur at lower frequencies than the losses due to interface waves. 5. Seasonal dependence In the previous discussion we have assumed constant sound velocity in the water and concentrated on the various mechanisms of bottom reflection loss.
It should also be noted that the actual values of the reflection loss depend on the attenuation coefficients of the sediment and the substrate; without media attenuations no high loss will occur. The normal mode code KRAKEN  is used to calculate the transmission loss for a shallow water situation with water depth 100 m and source and receiver at 50 m. In this calculation the parameters of Table 1 are used and the frequency is 100 Hz. Fig. 13 shows smoothed transmission loss VB range for three different layer thickness.