Estimate of the bottom compressional wave speed profile in the northeastern South China Sea using "Sources of Opportunity"


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dc.contributor.author Lin, Ying-Tsong
dc.contributor.author Lynch, James F.
dc.contributor.author Chotiros, Nick
dc.contributor.author Chen, Chi-Fang
dc.contributor.author Newhall, Arthur E.
dc.contributor.author Turgut, Altan
dc.contributor.author Schock, Steven G.
dc.contributor.author Chiu, Ching-Sang
dc.contributor.author Bartek, Louis R.
dc.contributor.author Liu, Char-Shine
dc.date.accessioned 2006-03-16T20:13:56Z
dc.date.available 2006-03-16T20:13:56Z
dc.date.issued 2004-10
dc.identifier.citation IEEE Journal of Oceanic Engineering 29 (2004): 1231-1248 en
dc.identifier.uri http://hdl.handle.net/1912/674
dc.description Author Posting. © IEEE, 2004. This article is posted here by permission of IEEE for personal use, not for redistribution. The definitive version was published in IEEE Journal of Oceanic Engineering 29 (2004): 1231-1248, doi:10.1109/JOE.2004.834681. en
dc.description.abstract The inversion of a broad-band "source of opportunity" signal for bottom geoacoustic parameters in the northeastern South China Sea (SCS) is presented, which supplements the towed source and chirp sonar bottom inversions that were performed as part of the Asian Seas International Acoustics Experiment (ASIAEX). This source of opportunity was most likely a "dynamite fishing" signal, which has sufficient low-frequency content (5-500 Hz) to make it complimentary to the somewhat higher frequency J-15-3 towed source (50-260 Hz) signals and the much higher frequency (1-10 kHz) chirp signals. This low frequency content will penetrate deeper into the bottom, thus extending the other inverse results. Localization of the source is discussed, using both a horizontal array for azimuthal steering and the "water wave" part of the pulse arrival for distance estimation. A linear broad-band inverse is performed, and three new variants of the broad-band inverse, based on: 1) the Airy phase; 2) the cutoff frequency; and 3) a range-dependent medium are presented. A multilayer model of the bottom compressional wave speed is obtained, and error estimates for this model are shown, both for the range-independent approximation to the waveguide and for the range-dependent waveguide. Directions for future research are discussed. en
dc.description.sponsorship This work was supported by the Office of Naval Research under Grant N0 001 498-1-0413, Grant N00014-00-0931, and Grant N00014-01-0772 and by the National Science Council, Taiwan, R.O.C. under Grant NSC92-2611-E-002-005-CCS. en
dc.format.extent 1203211 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher IEEE en
dc.relation.uri http://dx.doi.org/10.1109/JOE.2004.834681
dc.subject Broadband geoacoustic inversions en
dc.subject Shallow water acoustics en
dc.subject South China Sea en
dc.title Estimate of the bottom compressional wave speed profile in the northeastern South China Sea using "Sources of Opportunity" en
dc.type Article en
dc.identifier.doi 10.1109/JOE.2004.834681

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