Scattering from extended targets in range-dependent fluctuating ocean-waveguides with clutter from theory and experiments.
TLDR
Green's theorem based full-field modeling that describes scattering from vertically extended tubular targets in range-dependent ocean waveguides by taking into account nonuniform sound speed structure over the target's depth extent is shown to accurately describe the statistics of the targets' scattered field in all three field experiments.Abstract:
Bistatic, long-range measurements of acoustic scattered returns from vertically extended, air-filled tubular targets were made during three distinct field experiments in fluctuating continental shelf waveguides. It is shown that Sonar Equation estimates of mean target-scattered intensity lead to large errors, differing by an order of magnitude from both the measurements and waveguide scattering theory. The use of the Ingenito scattering model is also shown to lead to significant errors in estimating mean target-scattered intensity in the field experiments because they were conducted in range-dependent ocean environments with large variations in sound speed structure over the depth of the targets, scenarios that violate basic assumptions of the Ingenito model. Green’s theorem based full-field modeling that describes scattering from vertically extended tubular targets in range-dependent ocean waveguides by taking into account nonuniform sound speed structure over the target’s depth extent is shown to accura...read more
Citations
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Journal Article
Statistical optics
TL;DR: Development of this more comprehensive model of the behavior of light draws upon the use of tools traditionally available to the electrical engineer, such as linear system theory and the theory of stochastic processes.
Journal ArticleDOI
Fish population and behavior revealed by instantaneous continental‐shelf scale imaging
Nicholas C. Makris,Nicholas C. Makris,Nicholas C. Makris,Purnima Ratilal,Purnima Ratilal,Purnima Ratilal,Deanelle T. Symonds,Deanelle T. Symonds,Deanelle T. Symonds,Srinivasan Jagannathan,Srinivasan Jagannathan,Srinivasan Jagannathan,Sunwoong Lee,Sunwoong Lee,Sunwoong Lee,Redwood W. Nero,Redwood W. Nero,Redwood W. Nero +17 more
TL;DR: It is shown that fish populations in continental shelf environments can be instantaneously imaged over thousands of square kilometers and continuously monitored by a remote sensing technique in which the ocean acts as an acoustic waveguide.
Journal ArticleDOI
Vast assembly of vocal marine mammals from diverse species on fish spawning ground
Delin Wang,Heriberto A. Garcia,Wei Huang,Duong D. Tran,Ankita D. Jain,Dong Hoon Yi,Zheng Gong,Zheng Gong,J. Michael Jech,Olav Rune Godø,Nicholas C. Makris,Purnima Ratilal +11 more
TL;DR: Ratilal et al. as discussed by the authors used a combination of passive and active ocean acoustic waveguide remote sensing in an important northwestern Atlantic marine mammal autumn foraging ground to detect, localize and classify MM vocalizations from diverse species over an approximately 100,000 km2 region.
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Ecosystem Scale Acoustic Sensing Reveals Humpback Whale Behavior Synchronous with Herring Spawning Processes and Re-Evaluation Finds No Effect of Sonar on Humpback Song Occurrence in the Gulf of Maine in Fall 2006
Zheng Gong,Ankita D. Jain,Duong D. Tran,Dong Hoon Yi,Fan Wu,Alexander Michael Zorn,Purnima Ratilal,Nicholas C. Makris +7 more
TL;DR: It is shown that humpback-whale vocalization behavior is synchronous with peak annual Atlantic herring spawning processes in the Gulf of Maine, and analysis indicates that the song occurrence variation reported in Risch et al. is consistent with natural causes other than sonar.
Journal ArticleDOI
Continental Shelf-Scale Passive Acoustic Detection and Characterization of Diesel-Electric Ships Using a Coherent Hydrophone Array
TL;DR: The passive ocean acoustic waveguide remote sensing technique is employed to detect and characterize the underwater sound radiated from three scientific research and fishing vessels received at long ranges on a large-aperture densely-sampled horizontal coherent hydrophone array, which is dominated by distinct narrowband tonals and cyclostationary signals.
References
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Journal ArticleDOI
Light Scattering by Small Particles
H. C. Van de Hulst,V. Twersky +1 more
TL;DR: Light scattering by small particles as mentioned in this paper, Light scattering by Small Particle Scattering (LPS), Light scattering with small particles (LSC), Light Scattering by Small Parts (LSP),
Book
Light Scattering by Small Particles
TL;DR: Light scattering by small particles as mentioned in this paper, Light scattering by Small Particle Scattering (LPS), Light scattering with small particles (LSC), Light Scattering by Small Parts (LSP),
Book ChapterDOI
Light Scattering from Small Particles
TL;DR: In this article, the basic physics of elastic light scattering from small particles is studied for the simple case of a homogeneous and isotropic sphere, where the particle velocity and its properties are analyzed.
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