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 bear in mind the versions of acoustic propagation within the ocean and; (ii) to provide a point of view of the extensive set of ideas, difficulties, and purposes coming up in ocean exploration.
The e-book discusses comparable concerns and difficulties centred in version established acoustic sign processing equipment. in addition to addressing the matter of the propagation of acoustics within the ocean, it provides appropriate acoustic sign processing equipment like matched box processing, array processing, and localization and detection options. 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 issues, akin to the appliance of acoustics to fisheries, sea ground swath mapping by way of swath bathymetry and facet experiment sonar, self sustaining underwater cars and communications in underwater also are considered.
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Extra info for Acoustic Signal Processing for Ocean Exploration
16. c With shear ' - ' 12B. ) ~ B. 4. 0 ~ 256. o I-I 12B. ~ ""::i L _' . 0 ~ 64. 32. 16. 0 00 B. 4. 0 Grazing angle (degrees) Fig. 14. I =: 200 m/s and without shear, V,I =: O. III the layer, to produce the very high additional loss of about 17 dB at 20 km. With Dl = 10 m the additional loss is more moderate since in this case mainly the modes at about 15° are affected, with lower and higher modes falling outside the high loss region. 4. Shear waveguide effect. The final case to be studied with the single layer model is when the sedimentary layer can support a shear wave with a velocity that is lower than both the compressional velocity of the water and the sub bottom.
Am. 70, 149-156. M. (1980). "Waves in Layered Media" (Academic Press, New York)  Porter M. (1991)"The KRAKEN normal mode program," SM-245, SACLANT Undersea Research Centre, La Spezia. B. and Feria, M. C. (1979) "SNAP: The SACLANTCEN normal-mode acoustic propagation model," SM-121, SACLANT Undersea Research Centre, La Spezia. , (1980). A. B. Jensen (Plenum, New York), 557575. 40 TABLE I Parameters for the figures Figure No. 15 DIRECTIONAL MEASUREMENT OF DEEP SEA AMBIENT NOISE SPECTRA Heinz G.
4a in Eq. 2. 3. Layered bottom with fluid sediment We now consider a bottom with a top sedimentary layer over a semi-infinite subbottom. The subbottom can be either a fluid or a solid but in this section the layer is modelled as a fluid, leaving the solid layer to the following section. 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.
Acoustic Signal Processing for Ocean Exploration by Finn B. Jensen (auth.), José M. F. Moura, Isabel M. G. Lourtie (eds.)