Read e-book online Acoustic Sensing Techniques for the Shallow Water PDF

By Jean-Claude Le Gac, Yann Steéphan (auth.), Andrea Caiti, N. Ross Chapman, Jean-Pierre Hermand, Sérgio M. Jesus (eds.)

ISBN-10: 1402043724

ISBN-13: 9781402043727

ISBN-10: 1402043864

ISBN-13: 9781402043864

This quantity includes the gathering of papers from the second one workshop on Experimental Acoustic Inversion strategies for Exploration of the Shallow Water surroundings.

Acoustic strategies give you the finest capacity for distant sensing of ocean and sea ground procedures, and for probing the constitution underneath the ocean flooring. No different power propagates as successfully within the ocean: radio waves and visual mild are critically restricted in variety as the ocean is a hugely conductive medium. despite the fact that, sound from breaking waves and coastal transport should be heard through the ocean, and marine mammals converse acoustically over basin scale distances.

The papers during this ebook point out a excessive point of study curiosity that has generated major development in improvement and alertness of experimental acoustic inversion thoughts. The purposes span a vast scope in geosciences, from geophysical, organic or even geochemical study. The checklist contains: estimation of geotechnical homes of sea mattress fabrics; navigation and mapping of the ocean flooring; fisheries, aquaculture and sea mattress habitat evaluate; tracking of marine mammals; sediment delivery; and research of traditional geohazards in marine sediments.

Audience

This ebook is essentially meant for physicists and engineers operating in underwater acoustics and oceanic engineering. it is going to even be of curiosity to marine biologists, geophysicists and oceanographers as capability clients of the methodologies and methods defined within the ebook contributions.

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Additional resources for Acoustic Sensing Techniques for the Shallow Water Environment: Inversion Methods and Experiments

Example text

The basic ideas behind the different approaches are surveyed using a selection of key references and—whenever possible—trying to maintain a chronological order. Starting with Parvulescu’s pioneering work on matched equivalent-space signal (MESS) processing in Sec. 2 we subsequently outline the development of classical matched filter processing, beginning with Bucker’s original work and focusing on some of the most relevant processors in Sec. 3. Tappert’s work on acoustic retrogation in the 80s, which actually coincides with the early work on matched field processing, can be considered as “unconventional” matched field processing.

Jackson and Dowling [35], did not require knowledge of the medium properties or experimental geometry, whereas standard MFP source localisation methods suffered from the need for a nearly perfect and often unobtainable description of the medium. Compensation for multipath propagation and array imperfections was automatically achieved by a time-reversed retransmission of signals received by an array. Proceeding in chronological order, a number of experimental demonstrations of the TR mirror/ phase conjugate array followed in the second half of the 90s.

24, 25] have refined Tappert’s matched-field processor with an unnormalised ambiguity surface which is backpropagated using a higher-order Pade´ PE algorithm. Importantly, the computational effort needed to form the modified ambiguity surface is independent of the number of elements in the VRA. In [26] the authors also indicate how the backpropagated PE method can be used for spectral decomposition and matched-mode processing applications. In contrast to the two PE-based methods dealt with so far, Voltz and Lu [27, 28] apply a backpropagating ray technique for source localisation that exploits both the temporal and the spatial characteristics of the multipath arrival structure at a VRA.

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Acoustic Sensing Techniques for the Shallow Water Environment: Inversion Methods and Experiments by Jean-Claude Le Gac, Yann Steéphan (auth.), Andrea Caiti, N. Ross Chapman, Jean-Pierre Hermand, Sérgio M. Jesus (eds.)


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