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Author: Peter Wille
Publisher: Springer Science & Business Media
ISBN: 3540279105
Category : Science
Languages : en
Pages : 504
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Book Description
Sound Images of the Ocean is the first comprehensive overview of acoustic imaging applications in the various fields of marine research, utilization, surveillance, and protection. The book employs 400 sound images of the sea floor and of processes in the sea volume, contributed by more than 120 marine experts from 22 nations.
Author: Peter Wille
Publisher: Springer Science & Business Media
ISBN: 3540279105
Category : Science
Languages : en
Pages : 504
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Book Description
Sound Images of the Ocean is the first comprehensive overview of acoustic imaging applications in the various fields of marine research, utilization, surveillance, and protection. The book employs 400 sound images of the sea floor and of processes in the sea volume, contributed by more than 120 marine experts from 22 nations.
Author:
Publisher:
ISBN:
Category : Acoustic imaging
Languages : en
Pages :
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Book Description
Author: Richard P. Hodges
Publisher: John Wiley & Sons
ISBN: 1119957494
Category : Science
Languages : en
Pages : 386
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Book Description
Offering complete and comprehensive coverage of modern sonar spectrum system analysis, Underwater Acoustics: Analysis, Design and Performance of Sonar provides a state-of-the-art introduction to the subject and has been carefully structured to offer a much-needed update to the classic text by Urick. Expanded to included computational approaches to the topic, this book treads the line between the highly theoretical and mathematical texts and the more populist, non-mathematical books that characterize the existing literature in the field. The author compares and contrasts different techniques for sonar design, analysis and performance prediction and includes key experimental and theoretical results, pointing the reader towards further detail with extensive references. Practitioners in the field of sonar design, analysis and performance prediction as well as graduate students and researchers will appreciate this new reference as an invaluable and timely contribution to the field. Chapters include the sonar equation, radiated, self and ambient noise, active sonar sources, transmission loss, reverberation, transducers, active target strength, statistical detection theory, false alarms, contacts and targets, variability and uncertainty, modelling detections and tactical decision aids, cumulative probability of detection, tracking target motion analysis and localization, and design and evaluation of sonars
Author: Yan Don Cheng
Publisher:
ISBN:
Category : Acoustic imaging
Languages : en
Pages : 130
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 39
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Book Description
An innovation program to develop an underwater acoustic imaging system able to resolve objects down to millimetre resolution in turbid waters is under way. The defence need is for the identification of minelike objects. This report reviews options for the signal processing or beamforming stage of the program. An image consisting of 3x10 to the 9th power voxels (volume pixels) could be formed by a summation of the voltages from 4000 sensor elements, each taken from the element's voltage stream at the appropriate time. With a suitable allowance (factor of 9) for calculating the time delays, it appears at first sight that 9x1.2x10 to the 13th power operations would be required. The problem is to calculate a three-dimensional image of adequate quality in the shortest time at the least cost. A hierarchical structure of options is developed in an attempt to capture all possibilities. At the top level, three approaches are identified. First, the use of appropriate hardware, such as computers with parallelism. Second, a reduction in the number of operations (a software' solution). And third, the defining of a suitable reduced goal, which appears to come down to the imaging of a subvolume of the original volume that contains the object of interest. Each of these three approaches is divided into suboptions; these are discussed in detail to bring out difficulties and advantages.
Author: Robert Istepanian
Publisher: Springer Science & Business Media
ISBN: 9780792373049
Category : Science
Languages : en
Pages : 298
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Book Description
Underwater Acoustic Digital Signal Processing and Communication Systems describes new design and development methodologies in underwater acoustic signal processing. The emphasis is on experimental efforts and modern DSP implementations. The book assembles a number of contributions from authors who have contributed significantly to the field. The topics cover a broad range of underwater acoustic signal processing applications: underwater wireless communciations, array processing for mapping, detection and localization of objects, biotelemetry, speech processing for divers, acoustic imaging, and use of neural networks for underwater signal processing.
Author: Sidney Frankel
Publisher:
ISBN:
Category : Sound
Languages : en
Pages : 140
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Book Description
Author: Sidney Frankel
Publisher:
ISBN:
Category : Sound
Languages : en
Pages : 0
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Book Description
Author: David Graham Blair
Publisher:
ISBN:
Category : Acoustic imaging
Languages : en
Pages : 31
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Book Description
High-resolution underwater acoustic imaging using multi-element arrays implies a large computational load. For a three-dimensional viewing volume resolved into 3x10(exp 9) voxels (volume pixels), with 4000 elements, the computations needed are around 9x(1.2x10(exp 13)) floating-point operations. This report develops one of the more promising options for computing the full image. First, parallel computation is used to deal with the different sensor elements simultaneously, when calculating the address of the appropriate instantaneous voltage at the sensor element-or, equivalently, the calculation of the round-trip distance traveled by the acoustic pulse. This calculation requires, in a typical near-field situation, the computation either of a square root or of a fifth degree polynomial. This polynomial allows increased parallelism. Second, the summation in the beamforming is likewise done with a high degree of parallelism. A machine with the above design, with 10(exp 9) clock cycles per second, would compute the entire image in roughly 6 seconds. Cost and availability are not investigated.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 39
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Book Description
An innovation program to develop an underwater acoustic imaging system able to resolve objects down to millimetre resolution in turbid waters is under way. The defence need is for the identification of minelike objects. This report reviews options for the signal processing or beamforming stage of the program. An image consisting of 3x10 to the 9th power voxels (volume pixels) could be formed by a summation of the voltages from 4000 sensor elements, each taken from the element's voltage stream at the appropriate time. With a suitable allowance (factor of 9) for calculating the time delays, it appears at first sight that 9x1.2x10 to the 13th power operations would be required. The problem is to calculate a three-dimensional image of adequate quality in the shortest time at the least cost. A hierarchical structure of options is developed in an attempt to capture all possibilities. At the top level, three approaches are identified. First, the use of appropriate hardware, such as computers with parallelism. Second, a reduction in the number of operations (a software' solution). And third, the defining of a suitable reduced goal, which appears to come down to the imaging of a subvolume of the original volume that contains the object of interest. Each of these three approaches is divided into suboptions; these are discussed in detail to bring out difficulties and advantages.
