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Lagrangian ambient noise drifter
Proceedings of OCEANS'94, 2002The Defence Research Establishment Atlantic has carried out an experiment to study the relationship between ambient noise and oceanographic features in regions of pronounced oceanic currents, such as the Gulf Stream or its eddies, using a field of purpose built, long life drifting buoys developed and maintained at sea by Seimac Limited, of Dartmouth ...
W.C. Risley, I.A. Fraser, G.T. Leger
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The Journal of the Acoustical Society of America, 2001
Ambient Noise (AN) research during World War II was facilitated by the availability of calibrated instruments and motivated by the necessity to understand AN levels in coastal waters. The state-of-the-art was reviewed by Knudsen in 1948 and later by Pryce and Urick in 1954.
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Ambient Noise (AN) research during World War II was facilitated by the availability of calibrated instruments and motivated by the necessity to understand AN levels in coastal waters. The state-of-the-art was reviewed by Knudsen in 1948 and later by Pryce and Urick in 1954.
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IEEE Transactions on Signal Processing, 1993
Signal processing algorithms optimized for Gaussian noise may degrade significantly in a non-Gaussian noise environment. Therefore it is important to characterize the noise accurately before including its structure in the formulation of algorithms. A generic distribution suitable for modeling non-Gaussian ambient noise in the kurtosis range 1.8 >
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Signal processing algorithms optimized for Gaussian noise may degrade significantly in a non-Gaussian noise environment. Therefore it is important to characterize the noise accurately before including its structure in the formulation of algorithms. A generic distribution suitable for modeling non-Gaussian ambient noise in the kurtosis range 1.8 >
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Physics Today, 2010
Whether noise is a nuisance or a signal depends on how it’s processed. By cross-correlating noise recorded at two sensors, researchers can retrieve the waves that propagate between them and extract details about the intervening medium.
Roel Snieder, Kees Wapenaar
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Whether noise is a nuisance or a signal depends on how it’s processed. By cross-correlating noise recorded at two sensors, researchers can retrieve the waves that propagate between them and extract details about the intervening medium.
Roel Snieder, Kees Wapenaar
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Passive Imaging with Ambient Noise
2016Waves generated by opportunistic or ambient noise sources and recorded by passive sensor arrays can be used to image the medium through which they travel. Spectacular results have been obtained in seismic interferometry, which open up new perspectives in acoustics, electromagnetics, and optics.
Garnier, Josselin, Papanicolaou, G.
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The Journal of the Acoustical Society of America, 1964
Directional, spectral, and statistical properties of the under-ice noise in the arctic are presented. The measurements were made during a 15-day period on an ice floe in the Beaufort Basin in April 1963.
Charles R. Greene, Beaumont M. Buck
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Directional, spectral, and statistical properties of the under-ice noise in the arctic are presented. The measurements were made during a 15-day period on an ice floe in the Beaufort Basin in April 1963.
Charles R. Greene, Beaumont M. Buck
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1988
Mechanisms affecting ice floe interactions in the marginal ice zone (MIZ) are discussed. These mechanisms are assumed to be the major forcing functions driving the ambient noise levels in the MIZ. Results from previous studies are briefly summarized with hypotheses presented concerning the effect of ice eddies and grease ice on ambient noise.
Ola M. Johannessen +4 more
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Mechanisms affecting ice floe interactions in the marginal ice zone (MIZ) are discussed. These mechanisms are assumed to be the major forcing functions driving the ambient noise levels in the MIZ. Results from previous studies are briefly summarized with hypotheses presented concerning the effect of ice eddies and grease ice on ambient noise.
Ola M. Johannessen +4 more
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The Journal of the Acoustical Society of America, 2017
The Arctic Ocean is undergoing dramatic changes, with the most apparent being the rapidly reducing extent and thickness of the summer ice cover. Furthermore, a persistent inflow of a shallow tongue of warm Pacific water has recently been discovered in the Beaufort Sea region of the Arctic, often called the Beaufort Lens, which creates a strong acoustic
Andrew J. Poulsen, Henrik Schmidt
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The Arctic Ocean is undergoing dramatic changes, with the most apparent being the rapidly reducing extent and thickness of the summer ice cover. Furthermore, a persistent inflow of a shallow tongue of warm Pacific water has recently been discovered in the Beaufort Sea region of the Arctic, often called the Beaufort Lens, which creates a strong acoustic
Andrew J. Poulsen, Henrik Schmidt
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Ambient-Noise Directivity Measurements
The Journal of the Acoustical Society of America, 1964Measurements have been made from which the vertical directivity of ambient sea noise near the ocean bottom in water 14 500 ft deep has been computed. A vertical linear array of 40 hydrophones was used, with delay lines, to form 28 beams in directions from horizontal to vertically upward.
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Ambient noise bathymetric domains
The Journal of the Acoustical Society of America, 2011For the purposes of describing and understanding ambient sea noise for frequencies below about 300 Hz, most of the world's seas can be classified as belonging to one of three bathymetric domains. These domains are distinguished by their proximity to shipping lanes and by the degree to which they are exposed to noises originating at long distances.
Donald Ross +3 more
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