Acoustic Daylight
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Acoustic Daylight
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Author : Broderick VanBuren Berkhout
language : en
Publisher:
Release Date : 1992
Acoustic Daylight written by Broderick VanBuren Berkhout and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Ocean sounds categories.
Acoustic Daylight
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Author : Chad Lawrence Epifanio
language : en
Publisher:
Release Date : 1997
Acoustic Daylight written by Chad Lawrence Epifanio and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Ocean sounds categories.
Acoustic Daylight At Scripps Institution Of Oceanography
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Author : Mark Readhead
language : en
Publisher:
Release Date : 1988
Acoustic Daylight At Scripps Institution Of Oceanography written by Mark Readhead and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Acoustic daylight uses ambient noise in the ocean for target imaging. This technique is introduced and compared to traditional active and passive sonar. Theoretical studies of the method are summarized and the first experiment is described. An acoustic daylight imaging system, called ADONIS, is described in detail. It was constructed at Scripps Institution of Oceanography and consisted of a 130 element hydrophone array at the focal plane of a 3 m reflecting dish. The array elements were sensitive between 8-80 kHz. Amplification of the signal from each element was done in three stages and filtered into 16 frequency bins. The data was processed by a surface computer to produce two dimensional images displayed on a screen with a 25 Hz update rate. The device was deployed at a number of sites, with most measurements done in San Diego Bay. During some of these deployments ancillary equipment was used, including omnidirectional hydrophones. These are described, as well as measurements of the noise field in the vicinity of ADONIS. A series of targets were imaged, being planar, cylindrical and spherical in shape, at ranges of 15-40 m. Acoustic daylight images of these targets are presented under varying ensonification conditions. ADONIS was able to image all targets, with varying resolution and contrast between the target and background. In some cases it was able to distinguish between different target compositions through the reflected spectral content.
Underwater Acoustic Modeling
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Author : P.C. Etter
language : en
Publisher: CRC Press
Release Date : 1995-11-30
Underwater Acoustic Modeling written by P.C. Etter and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-11-30 with Architecture categories.
Underwater Acoustic Modeling provides the only comprehensive source on how to translate our physical understanding of sound in the sea into mathematical formulas solvable by computers.
Acoustic Daylight At Scripps Institution Of Oceanography
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Author : Mark Readhead
language : en
Publisher:
Release Date : 1998
Acoustic Daylight At Scripps Institution Of Oceanography written by Mark Readhead and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Acoustic imaging categories.
Underwater Acoustic Modeling And Simulation
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Author : Paul C. Etter
language : en
Publisher: CRC Press
Release Date : 2018-04-06
Underwater Acoustic Modeling And Simulation written by Paul C. Etter and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-06 with Technology & Engineering categories.
This newest edition adds new material to all chapters, especially in mathematical propagation models and special applications and inverse techniques. It has updated environmental-acoustic data in companion tables and core summary tables with the latest underwater acoustic propagation, noise, reverberation, and sonar performance models. Additionally
Underwater Acoustic Modeling And Simulation Fourth Edition
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Author : Paul C. Etter
language : en
Publisher: CRC Press
Release Date : 2013-02-21
Underwater Acoustic Modeling And Simulation Fourth Edition written by Paul C. Etter and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-02-21 with Technology & Engineering categories.
Underwater Acoustic Modeling and Simulation, Fourth Edition continues to provide the most authoritative overview of currently available propagation, noise, reverberation, and sonar-performance models. This fourth edition of a bestseller discusses the fundamental processes involved in simulating the performance of underwater acoustic systems and emphasizes the importance of applying the proper modeling resources to simulate the behavior of sound in virtual ocean environments. New to the Fourth Edition Extensive new material that addresses recent advances in inverse techniques and marine-mammal protection Problem sets in each chapter Updated and expanded inventories of available models Designed for readers with an understanding of underwater acoustics but who are unfamiliar with the various aspects of modeling, the book includes sufficient mathematical derivations to demonstrate model formulations and provides guidelines for selecting and using the models. Examples of each type of model illustrate model formulations, model assumptions, and algorithm efficiency. Simulation case studies are also included to demonstrate practical applications. Providing a thorough source of information on modeling resources, this book examines the translation of our physical understanding of sound in the sea into mathematical models that simulate acoustic propagation, noise, and reverberation in the ocean. The text shows how these models are used to predict and diagnose the performance of complex sonar systems operating in the undersea environment.
Underwater Acoustic Modelling And Simulation
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Author : P.C. Etter
language : en
Publisher: CRC Press
Release Date : 2003-12-08
Underwater Acoustic Modelling And Simulation written by P.C. Etter and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-12-08 with Technology & Engineering categories.
Underwater Acoustic Modeling and Simulation examines the translation of our physical understanding of sound in the sea into mathematical models that can simulate acoustic propagation, noise and reverberation in the ocean. These models are used in a variety of research and operational applications to predict and diagnose the performance of complex s
Underwater Acoustic Modelling And Simulation Third Edition
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Author : P.C. Etter
language : en
Publisher: CRC Press
Release Date : 2003-12-08
Underwater Acoustic Modelling And Simulation Third Edition written by P.C. Etter and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-12-08 with Technology & Engineering categories.
Underwater Acoustic Modeling and Simulation examines the translation of our physical understanding of sound in the sea into mathematical models that can simulate acoustic propagation, noise and reverberation in the ocean. These models are used in a variety of research and operational applications to predict and diagnose the performance of complex sonar systems operating in the undersea environment. Previous editions of the book have provided invaluable guidance to sonar technologists, acoustical oceanographers and applied mathematicians in the selection and application of underwater acoustic models. Now that simulation is fast becoming an accurate, efficient and economical alternative to field-testing and at-sea training, this new edition will also provide useful guidance to systems engineers and operations analysts interested in simulating sonar performance. Guidelines for selecting and using available propagation, noise and reverberation models are highlighted. Specific examples of each type of model are discussed to illustrate model formulations, assumptions and algorithm efficiency. Instructive case studies demonstrate applications in sonar simulation.
Correlation Time Of Ocean Ambient Noise Intensity In San Diego Bay And Target Recognition In Acoustic Daylight Images
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Author : Adam J. Wadsworth
language : en
Publisher:
Release Date : 2010
Correlation Time Of Ocean Ambient Noise Intensity In San Diego Bay And Target Recognition In Acoustic Daylight Images written by Adam J. Wadsworth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
A method for passively detecting and imaging underwater targets using ambient noise as the sole source of illumination (named acoustic daylight) was successfully implemented in the form of the Acoustic Daylight Ocean Noise Imaging System (ADONIS). In a series of imaging experiments conducted in San Diego Bay, where the dominant source of high-frequency ambient noise is snapping shrimp, a large quantity of ambient noise intensity data was collected with the ADONIS (Epifanio, 1997). In a subset of the experimental data sets, fluctuations of time-averaged ambient noise intensity exhibited a diurnal pattern consistent with the increase in frequency of shrimp snapping near dawn and dusk. The same subset of experimental data is revisited here and the correlation time is estimated and analysed for sequences of ambient noise data several minutes in length, with the aim of detecting possible periodicities or other trends in the fluctuation of the shrimp-dominated ambient noise field. Using videos formed from sequences of acoustic daylight images along with other experimental information, candidate segments of static-configuration ADONIS raw ambient noise data were isolated. For each segment, the normalized intensity auto-correlation closely resembled the delta function, the auto-correlation of white noise. No intensity fluctuation patterns at timescales smaller than a few minutes were discernible, suggesting that the shrimp do not communicate, synchronise, or exhibit any periodicities in their snapping. Also presented here is a ADONIS-specific target recognition algorithm based on principal component analysis, along with basic experimental results using a database of acoustic daylight images.