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Download or read book North Pacific Acoustic Laboratory written by and published by . This book was released on 2001 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The North Pacific Acoustic Laboratory written by Dr. Alexandra Tolstoy and published by . This book was released on 2005 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Published: 2007
Total Pages: 6
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DOWNLOAD EBOOKAs the limits of long-range sonar are affected by ocean variability, the overarching goal of this work is to characterize, understand, and -predict sound-speed variability in the upper ocean. Sound speed is a function of the ocean state variables temperature T, salinity S, which are themselves affected by such processes as stirring, mixing and internal waves. A long-range goal is thus the inversion of acoustic data to measure these processes.
Download or read book North Pacific Acoustic Laboratory - Underway CTD and SeaSoar Observations written by and published by . This book was released on 2007 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the limits of long-range sonar are affected by ocean variability, the overarching goal of this work is to characterize, understand, and -predict sound-speed variability in the upper ocean. Sound speed is a function of the ocean state variables temperature T, salinity S, which are themselves affected by such processes as stirring, mixing and internal waves. A long-range goal is thus the inversion of acoustic data to measure these processes.
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Published: 2009
Total Pages: 7
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DOWNLOAD EBOOKThe long-term goal of this research is to understand deep-water propagation, with particular emphasis placed on the passive quiet target detection problem. Focus is on the spatial/temporal structure of acoustic paths for moving sources and moving receivers. Propagation paths are separated into two classes: bottom interacting and refracted/surface-reflected (non-bottom interacting). This research seeks to understand the impact that mid-ocean variability (internal waves, mixed layer variability) and seafloor scattering have on the detection problem.
Download or read book North Pacific Acoustic Laboratory (NPAL) - Towed Array Measurements written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long-term goal of this research is to understand deep-water propagation, with particular emphasis placed on the passive quiet target detection problem. Focus is on the spatial/temporal structure of acoustic paths for moving sources and moving receivers. Propagation paths are separated into two classes: bottom interacting and refracted/surface-reflected (non-bottom interacting). This research seeks to understand the impact that mid-ocean variability (internal waves, mixed layer variability) and seafloor scattering have on the detection problem.
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Published: 2009
Total Pages: 12
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DOWNLOAD EBOOKThe North Pacific Acoustic Laboratory (NPAL) program is intended to improve our understanding of (i) the basic physics of low-frequency, broadband propagation in deep water, including the effects of oceanographic variability on signal stability and coherence, (ii) the structure of the ambient noise field in deep water at low frequencies, and (iii) the extent to which acoustic methods, together with other measurements and coupled with ocean modeling, can yield estimates of the time-evolving ocean state useful for acoustic predictions. The goal is to determine the fundamental limits to signal processing in deep water imposed by ocean processes, enabling advanced signal processing techniques to capitalize on the three-dimensional character of the sound and noise fields.
Download or read book North Pacific Acoustic Laboratory: Deep Water Acoustic Propagation in the Philippine Sea written by and published by . This book was released on 2009 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The North Pacific Acoustic Laboratory (NPAL) program is intended to improve our understanding of (i) the basic physics of low-frequency, broadband propagation in deep water, including the effects of oceanographic variability on signal stability and coherence, (ii) the structure of the ambient noise field in deep water at low frequencies, and (iii) the extent to which acoustic methods, together with other measurements and coupled with ocean modeling, can yield estimates of the time-evolving ocean state useful for acoustic predictions. The goal is to determine the fundamental limits to signal processing in deep water imposed by ocean processes, enabling advanced signal processing techniques to capitalize on the three-dimensional character of the sound and noise fields.
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Published: 2009
Total Pages: 12
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DOWNLOAD EBOOKOver the decade 1996-2006, acoustic sources located off central California and north of Kauai transmitted to receivers distributed throughout the northeast and north central Pacific. Some of the observations included "shadow-zone arrivals", that appear at travel times aligned with the lower cusps of the acoustic time front predicted by ray calculations, but with the depth of the receiver lies well below the depths of the predicted cusps. Several models for the temperature and salinity in the North Pacific Ocean were obtained and processed to enable simulations of acoustic propagation for comparison to the observations. New tools were developed to manage the large size of the model output, to extract and construct the relevant acoustic properties from the model output, and to make the acoustic calculations. Computer codes using ray tracing and the parabolic equation to calculate acoustic properties were significantly developed. The acoustic data show that WOA05 is a better estimate of the time-mean hydrography than either the JPL-ECCO or the POP estimates, which proved incapable of reproducing the observed acoustic arrival patterns.
Download or read book North Pacific Acoustic Laboratory: Analysis of Shadow Zone Arrivals and Acoustic Propagation in Numerical Ocean Models written by and published by . This book was released on 2009 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the decade 1996-2006, acoustic sources located off central California and north of Kauai transmitted to receivers distributed throughout the northeast and north central Pacific. Some of the observations included "shadow-zone arrivals", that appear at travel times aligned with the lower cusps of the acoustic time front predicted by ray calculations, but with the depth of the receiver lies well below the depths of the predicted cusps. Several models for the temperature and salinity in the North Pacific Ocean were obtained and processed to enable simulations of acoustic propagation for comparison to the observations. New tools were developed to manage the large size of the model output, to extract and construct the relevant acoustic properties from the model output, and to make the acoustic calculations. Computer codes using ray tracing and the parabolic equation to calculate acoustic properties were significantly developed. The acoustic data show that WOA05 is a better estimate of the time-mean hydrography than either the JPL-ECCO or the POP estimates, which proved incapable of reproducing the observed acoustic arrival patterns.
Author: United States. Office of Naval Research
Publisher:
Published: 2001
Total Pages:
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DOWNLOAD EBOOKDownload or read book Final Environmental Impact Statement for the North Pacific Acoustic Laboratory written by United States. Office of Naval Research and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Published: 1998
Total Pages: 5
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DOWNLOAD EBOOKThe ultimate limits of long-range sonar are imposed by ocean variability and the ambient sound field. Scattering from internal waves limits the temporal and spatial coherence of the received signal. Low frequency noise is dominated by shipping and ultimately, by wave-breaking processes. The resulting granularity of the noise field can be exploited for detection and localization purposes. The ultimate objective is to understand the fundamental limits to signal processing imposed by these ocean processes, to enable advanced signal processing techniques, including matched field processing and other adaptive array processing methods, to capitalize on the three-dimensional character of the sound and noise fields. The objective of this research is to understand the basic physics of low frequency, broadband propagation and the effects of environmental variability on signal stability and coherence. In particular, it focuses on 3-D wave front coherence (horizontal, vertical, and temporal), on the details of signal energy redistribution through mode scattering, on signal and noise variability on ocean-basin scales, and on environmental processes such as internal waves that most affect long-range coherence.
Download or read book Repair of a Cable as it Relates to the North Pacific Acoustic Laboratory written by and published by . This book was released on 1998 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ultimate limits of long-range sonar are imposed by ocean variability and the ambient sound field. Scattering from internal waves limits the temporal and spatial coherence of the received signal. Low frequency noise is dominated by shipping and ultimately, by wave-breaking processes. The resulting granularity of the noise field can be exploited for detection and localization purposes. The ultimate objective is to understand the fundamental limits to signal processing imposed by these ocean processes, to enable advanced signal processing techniques, including matched field processing and other adaptive array processing methods, to capitalize on the three-dimensional character of the sound and noise fields. The objective of this research is to understand the basic physics of low frequency, broadband propagation and the effects of environmental variability on signal stability and coherence. In particular, it focuses on 3-D wave front coherence (horizontal, vertical, and temporal), on the details of signal energy redistribution through mode scattering, on signal and noise variability on ocean-basin scales, and on environmental processes such as internal waves that most affect long-range coherence.
Author: United States. Office of Naval Research
Publisher:
Published: 2000
Total Pages:
ISBN-13:
DOWNLOAD EBOOKDownload or read book Draft Environmental Impact Statement for the North Pacific Acoustic Laboratory written by United States. Office of Naval Research and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Published: 2007
Total Pages: 154
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DOWNLOAD EBOOKTwo research cruises were conducted in the summers of 1998 and 1999 as part of the North Pacific Acoustic Laboratory (NPAL) project. The cruises objective was to test the theory that predicts acoustic fluctuations from the internal wave sound speed or temperature fluctuations. Here we discuss the in situ profile measurements of temperature, salinity, and derived sound speed taken with conductivity temperature density (CTD) instruments dropped off the side of the ships as they steamed between the NPAL Acoustic Thermometry of Ocean Climate source off Kauai and a billboard receiving array on Sur Ridge off Point Sur, California. The first cruise, IW98, was aboard the University of Hawaii research vessel Moana Wave. The second cruise, IW99, was aboard the R/V Melville.
Download or read book North Pacific Acoustic Laboratory CTD Data: R/V Moana Wave Cruise IW98 (August 15-30, 1998) and R/V Melville Cruise IW99 (June 18-July 3, 1999). written by and published by . This book was released on 2007 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two research cruises were conducted in the summers of 1998 and 1999 as part of the North Pacific Acoustic Laboratory (NPAL) project. The cruises objective was to test the theory that predicts acoustic fluctuations from the internal wave sound speed or temperature fluctuations. Here we discuss the in situ profile measurements of temperature, salinity, and derived sound speed taken with conductivity temperature density (CTD) instruments dropped off the side of the ships as they steamed between the NPAL Acoustic Thermometry of Ocean Climate source off Kauai and a billboard receiving array on Sur Ridge off Point Sur, California. The first cruise, IW98, was aboard the University of Hawaii research vessel Moana Wave. The second cruise, IW99, was aboard the R/V Melville.
