Temporal coherence of the acoustic field forward propagated through a continental shelf with random internal waves
An analytical model derived from normal mode theory for the accumulated effects of range-dependent multiple forward scattering is applied to estimate the temporal coherence of the acoustic field forward propagated through a continental-shelf waveguide containing random three-dimensional internal wav...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Acoustical Society of America (ASA)
2015
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| Online Access: | http://hdl.handle.net/1721.1/97629 https://orcid.org/0000-0003-4369-296X |
| _version_ | 1811071547884961792 |
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| author | Gong, Zheng Chen, Tianrun Ratilal, Purnima Makris, Nicholas |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Gong, Zheng Chen, Tianrun Ratilal, Purnima Makris, Nicholas |
| author_sort | Gong, Zheng |
| collection | MIT |
| description | An analytical model derived from normal mode theory for the accumulated effects of range-dependent multiple forward scattering is applied to estimate the temporal coherence of the acoustic field forward propagated through a continental-shelf waveguide containing random three-dimensional internal waves. The modeled coherence time scale of narrow band low-frequency acoustic field fluctuations after propagating through a continental-shelf waveguide is shown to decay with a power-law of range to the −1/2 beyond roughly 1 km, decrease with increasing internal wave energy, to be consistent with measured acoustic coherence time scales. The model should provide a useful prediction of the acoustic coherence time scale as a function of internal wave energy in continental-shelf environments. The acoustic coherence time scale is an important parameter in remote sensing applications because it determines (i) the time window within which standard coherent processing such as matched filtering may be conducted, and (ii) the number of statistically independent fluctuations in a given measurement period that determines the variance reduction possible by stationary averaging. |
| first_indexed | 2024-09-23T08:52:54Z |
| format | Article |
| id | mit-1721.1/97629 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:52:54Z |
| publishDate | 2015 |
| publisher | Acoustical Society of America (ASA) |
| record_format | dspace |
| spelling | mit-1721.1/976292022-09-30T11:51:47Z Temporal coherence of the acoustic field forward propagated through a continental shelf with random internal waves Gong, Zheng Chen, Tianrun Ratilal, Purnima Makris, Nicholas Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Massachusetts Institute of Technology. Department of Mechanical Engineering Gong, Zheng Chen, Tianrun Makris, Nicholas An analytical model derived from normal mode theory for the accumulated effects of range-dependent multiple forward scattering is applied to estimate the temporal coherence of the acoustic field forward propagated through a continental-shelf waveguide containing random three-dimensional internal waves. The modeled coherence time scale of narrow band low-frequency acoustic field fluctuations after propagating through a continental-shelf waveguide is shown to decay with a power-law of range to the −1/2 beyond roughly 1 km, decrease with increasing internal wave energy, to be consistent with measured acoustic coherence time scales. The model should provide a useful prediction of the acoustic coherence time scale as a function of internal wave energy in continental-shelf environments. The acoustic coherence time scale is an important parameter in remote sensing applications because it determines (i) the time window within which standard coherent processing such as matched filtering may be conducted, and (ii) the number of statistically independent fluctuations in a given measurement period that determines the variance reduction possible by stationary averaging. 2015-07-01T18:49:47Z 2015-07-01T18:49:47Z 2013-09 2013-08 Article http://purl.org/eprint/type/JournalArticle 00014966 http://hdl.handle.net/1721.1/97629 Gong, Zheng, Tianrun Chen, Purnima Ratilal, and Nicholas C. Makris. “Temporal Coherence of the Acoustic Field Forward Propagated through a Continental Shelf with Random Internal Waves.” The Journal of the Acoustical Society of America 134, no. 5 (2013): 3476. © 2013 Acoustical Society of America https://orcid.org/0000-0003-4369-296X en_US http://dx.doi.org/10.1121/1.4824157 The Journal of the Acoustical Society of America Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Acoustical Society of America (ASA) Acoustical Society of America |
| spellingShingle | Gong, Zheng Chen, Tianrun Ratilal, Purnima Makris, Nicholas Temporal coherence of the acoustic field forward propagated through a continental shelf with random internal waves |
| title | Temporal coherence of the acoustic field forward propagated through a continental shelf with random internal waves |
| title_full | Temporal coherence of the acoustic field forward propagated through a continental shelf with random internal waves |
| title_fullStr | Temporal coherence of the acoustic field forward propagated through a continental shelf with random internal waves |
| title_full_unstemmed | Temporal coherence of the acoustic field forward propagated through a continental shelf with random internal waves |
| title_short | Temporal coherence of the acoustic field forward propagated through a continental shelf with random internal waves |
| title_sort | temporal coherence of the acoustic field forward propagated through a continental shelf with random internal waves |
| url | http://hdl.handle.net/1721.1/97629 https://orcid.org/0000-0003-4369-296X |
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