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 give sign processing algorithms that take into consideration the types of acoustic propagation within the ocean and; (ii) to offer a standpoint of the large set of thoughts, difficulties, and purposes coming up in ocean exploration.
The ebook discusses comparable matters and difficulties centred in version established acoustic sign processing tools. in addition to addressing the matter of the propagation of acoustics within the ocean, it provides suitable acoustic sign processing tools like matched box processing, array processing, and localization and detection concepts. 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 points of those subject matters, comparable to the appliance of acoustics to fisheries, sea flooring swath mapping via swath bathymetry and aspect test sonar, self reliant underwater autos and communications in underwater also are considered.
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Acoustic sign Processing for Ocean Explortion has significant ambitions: (i) to offer sign processing algorithms that take into consideration the versions of acoustic propagation within the ocean and; (ii) to offer a point of view of the extensive set of ideas, difficulties, and functions coming up in ocean exploration.
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Additional info for Acoustic Signal Processing for Ocean Exploration
The numerical models presently available for system's performance prediction are capable of treating quite complicated fluid/elastic layered bottoms, but the limiting factor is often the lack of adequate bottom parameters as input. Subsequently, a large effort is currently engaged in designing new tools and methods for collecting bottom parameters as input to acoustic propagation models. This paper gives an overview of how the bottom properties influence the propagation loss with particular emphasis on shallow water.
As a result. a directional diagram of the ambient noise field is obtained which shows level versus frequency for all horizontal directions. Measurement results show directional spectra and the horizontal variations. They can be contributed to far distant ship traffic and the levels depend on number of ships. individuals ranges and the prevailing sound propagation conditions in the various directions. Directions of low traffic can be selected and the spectrum of the ambient noise can be computed.
References  I. S. Clay, Ocean Acoustics: Theory and Experiment in Underwater Sound (McGraw-Hill, New York, NY, 1966). S. Clay and H. Medwin, Acoustical Oceanography. (Wiley, New York, NY, 1977). M. Brekhovskikh and Yu. Lysanov, Fundamentals of Ocean Acoustics. (SpringerVerlag, Berlin, FRG, 1982). J. Urick, Principles of Underwater Sound, 3rd edition. (McGraw-Hill, New York, NY, 1983).  J. Sells chopp , Towed thermistor chain data collected during the cruise NORDMEER 87, Rep. FWG-87-4 (Forschungsanstalt der Bundeswehr fiiI Wassershall- und Geophysik, Kiel, FRG, 1987).