[Repair of a cable as it relates to the North Pacific Acoustic Laboratory]

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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 ... continued below

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5 p.

Creation Information

Spindel, R.C. & Worcester, P.F. December 31, 1998.

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  • Spindel, R.C. Univ. of Washington, Seattle, WA (United States)
  • Worcester, P.F. Univ. of California, La Jolla, CA (United States). Scripps Institution of Oceanography

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Description

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.

Physical Description

5 p.

Notes

OSTI as DE99002802

Source

  • Other Information: PBD: [1998]

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  • Other: DE99002802
  • Report No.: DOE/ER/62447--T1
  • Grant Number: AI02-97ER62447
  • DOI: 10.2172/353225 | External Link
  • Office of Scientific & Technical Information Report Number: 353225
  • Archival Resource Key: ark:/67531/metadc683971

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • December 31, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

Description Last Updated

  • Nov. 6, 2015, 4:32 p.m.

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Spindel, R.C. & Worcester, P.F. [Repair of a cable as it relates to the North Pacific Acoustic Laboratory], report, December 31, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc683971/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.