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The book is an edited collection of research articles covering the current state of sonar systems, the signal processing methods and their applications prepared by experts in the field. The first section is dedicated to the theory and applications of innovative synthetic aperture, interferometric, multistatic sonars and modeling and simulation. Special section in the book is dedicated to sonar signal processing methods covering: passive sonar array beamforming, direction of arrival estimation, signal detection and classification using DEMON and LOFAR principles, adaptive matched field signal processing. The image processing techniques include: image denoising, detection and classification of artificial mine like objects and application of hidden Markov model and artificial neural networks for signal classification. The biology applications include the analysis of biosonar capabilities and underwater sound influence on human hearing. The marine science applications include fish species target strength modeling, identification and discrimination from bottom scattering and pelagic biomass neural network estimation methods. Marine geology has place in the book with geomorphological parameters estimation from side scan sonar images. The book will be interesting not only for specialists in the area but also for readers as a guide in sonar systems principles of operation, signal processing methods and marine applications.
Sonar. --- Asdic --- Echo ranging --- Sound navigation ranging --- Detectors --- Electronics in navigation --- Signals and signaling, Submarine --- Ultrasonic equipment --- Underwater acoustics --- Acoustic & sound engineering
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This book develops the theory of ocean ambient noise mechanisms and measurements, and also describes general noise characteristics and computational methods. It concisely summarizes the vast ambient noise literature using theory combined with key representative results. The air-sea boundary interaction zone is described in terms of non-dimensional variables requisite for future experiments. Noise field coherency, rare directional measurements, and unique basin scale computations and methods are presented. The use of satellite measurements in these basin scale models is demonstrated. Finally, this book provides a series of appendices giving in-depth mathematical treatments. With its complete and careful discussions of both theory and experimental results, this book will be of the greatest interest to graduate students and active researchers working in fields related to ambient noise in the ocean.
Underwater acoustics. --- Underwater acoustics --- Ambient sounds --- Physics --- Earth & Environmental Sciences --- Physical Sciences & Mathematics --- Acoustics & Sound --- Marine Science --- Acoustics, Underwater --- Hydroacoustics --- Underwater sound --- Physics. --- Oceanography. --- Acoustics. --- Acoustical engineering. --- Engineering Acoustics. --- Signal, Image and Speech Processing. --- Fluids --- Sound --- Acoustic properties --- Acoustics in engineering. --- Oceanography, Physical --- Oceanology --- Physical oceanography --- Thalassography --- Earth sciences --- Marine sciences --- Ocean --- Signal processing. --- Image processing. --- Speech processing systems. --- Computational linguistics --- Electronic systems --- Information theory --- Modulation theory --- Oral communication --- Speech --- Telecommunication --- Singing voice synthesizers --- Pictorial data processing --- Picture processing --- Processing, Image --- Imaging systems --- Optical data processing --- Processing, Signal --- Information measurement --- Signal theory (Telecommunication) --- Acoustic engineering --- Sonic engineering --- Sonics --- Sound engineering --- Sound-waves --- Engineering --- Industrial applications
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Since the mid-1970s, the computer has played an increasingly pivotal role in the field of ocean acoustics. Faster and less expensive than actual ocean experiments, and capable of accommodating the full complexity of the acoustic problem, numerical models are now standard research tools in ocean laboratories. The progress made in computational ocean acoustics over the last thirty years is summed up in this authoritative and innovatively illustrated new text. Written by some of the field's pioneers, all Fellows of the Acoustical Society of America, Computational Ocean Acoustics presents the latest numerical techniques for solving the wave equation in heterogeneous fluid–solid media. The authors discuss various computational schemes in detail, emphasizing the importance of theoretical foundations that lead directly to numerical implementations for real ocean environments. To further clarify the presentation, the fundamental propagation features of the techniques are illustrated in color. Computational Ocean Acoustics conveys the state-of-the-art of numerical modeling techniques for graduate and undergraduate students of acoustics, geology and geophysics, applied mathematics, and ocean engineering. It is also an essential addition to the libraries of ocean research institutions that use propagation models.
Computer science. --- Underwater acoustics -- Measurement -- Data processing. --- Underwater acoustics --- Physics --- Physical Sciences & Mathematics --- Acoustics & Sound --- Measurement --- Data processing --- Data processing. --- Acoustics, Underwater --- Hydroacoustics --- Underwater sound --- Informatics --- Physics. --- Oceanography. --- Computer simulation. --- Acoustics. --- Acoustical engineering. --- Simulation and Modeling. --- Engineering Acoustics. --- Science --- Fluids --- Sound --- Acoustic properties --- Acoustics in engineering. --- Computer modeling --- Computer models --- Modeling, Computer --- Models, Computer --- Simulation, Computer --- Electromechanical analogies --- Mathematical models --- Simulation methods --- Model-integrated computing --- Oceanography, Physical --- Oceanology --- Physical oceanography --- Thalassography --- Earth sciences --- Marine sciences --- Ocean --- Acoustic engineering --- Sonic engineering --- Sonics --- Sound engineering --- Sound-waves --- Engineering --- Industrial applications
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This book was written for researchers and engineers working with aerial and underwater acoustics. It examines the interactions of acoustic waves with obstacles that may be rigid, soft, elastic, or characterized by an impedance boundary condition. The approach is founded on asymptotic high-frequency diffraction methods based on the concept of rays. Despite the progress in the field of numerical methods for diffraction problems, ray methods remain the most useful approximate methods for analyzing wave motions. Ray methods provide considerable physical insight into diffraction mechanisms and allow for the analytic treatment of objects that are still too large in terms of wavelength to be solved in the realm of numerical methods.
Sound-waves --- Vibration --- Waves --- Diffraction --- Mathematical models. --- Aerial acoustics --- Underwater acoustics --- Asymptotic expansions --- Acoustic waves --- Impedance boundary conditions --- Canonical problems --- Creeping waves --- Elastic surface waves --- Whispering gallery modes --- Maliuzhinets's diffraction coefficient --- Uniform asymptotic theory --- Field near a caustic --- Hybrid diffraction coefficients
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Since the mid-1970s, the computer has played an increasingly pivotal role in the field of ocean acoustics. Faster and less expensive than actual ocean experiments, and capable of accommodating the full complexity of the acoustic problem, numerical models are now standard research tools in ocean laboratories. The progress made in computational ocean acoustics over the last thirty years is summed up in this authoritative and innovatively illustrated new text. Written by some of the field's pioneers, all Fellows of the Acoustical Society of America, Computational Ocean Acoustics presents the latest numerical techniques for solving the wave equation in heterogeneous fluid-solid media. The authors discuss various computational schemes in detail, emphasizing the importance of theoretical foundations that lead directly to numerical implementations for real ocean environments. To further clarify the presentation, the fundamental propagation features of the techniques are illustrated in color. Computational Ocean Acoustics conveys the state-of-the-art of numerical modeling techniques for graduate and undergraduate students of acoustics, geology and geophysics, applied mathematics, and ocean engineering. It is also an essential addition to the libraries of ocean research institutions that use propagation models.
Vibrations --- Hydrosphere --- Artificial intelligence. Robotics. Simulation. Graphics --- geluidsleer --- akoestiek --- geluidsisolatie --- elektro-akoestiek --- vormgeving --- simulaties --- KI (kunstmatige intelligentie) --- oceanografie --- Underwater acoustics --- Measurement --- Data processing. --- 534.6 --- 534.8 --- 621.391 --- Acoustics, Underwater --- Hydroacoustics --- Underwater sound --- Fluids --- Sound --- 621.391 General questions of electrical communication engineering. Cybernetics. Information theory. Signal theory --- General questions of electrical communication engineering. Cybernetics. Information theory. Signal theory --- 534.8 Applications of acoustics (theory) --- Applications of acoustics (theory) --- 534.6 Acoustic measurements --- Acoustic measurements --- Measurement&delete& --- Data processing --- Acoustic properties
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