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  • 1
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    Piecewise coherent mode processing of acoustic data recorded on two horizontally separated vertical line arrays (2012)
    Acoustical Society of America
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Acoustical Society of America, 2012. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 131 (2012): EL492-EL498, doi:10.1121/1.4722193.
    Description: Motivated by measurements made in the 2004 Long-Range Ocean Acoustic Propagation Experiment (LOAPEX), the problem of mode processing transient acoustic signals collected on two nearby vertical line arrays is considered. The first three moments (centroid, variance, and skewness) of broadband distributions of acoustic energy with fixed mode number (referred to as modal group arrivals) are estimated. It is shown that despite the absence of signal coherence between the two arrays and poor high mode number energy resolution, the centroid and variance of these distributions can be estimated with tolerable errors using piecewise coherent mode processing as described in this paper.
    Description: This work was supported by the Office of Naval Research, Code 322, Grant Nos. N00014-06-1-0245, N00014-08-1-0195, and N00014-11-1-0194.
    Keywords: Acoustic arrays ; Acoustic signal processing ; Modal analysis ; Underwater acoustic propagation
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 2
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    Deep seafloor arrivals in long range ocean acoustic propagation (2013)
    Acoustical Society of America
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Acoustical Society of America, 2013. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 134 (2013): 3307-3317, doi:10.1121/1.4818845.
    Description: Ocean bottom seismometer observations at 5000 m depth during the long-range ocean acoustic propagation experiment in the North Pacific in 2004 show robust, coherent, late arrivals that are not readily explained by ocean acoustic propagation models. These “deep seafloor” arrivals are the largest amplitude arrivals on the vertical particle velocity channel for ranges from 500 to 3200 km. The travel times for six (of 16 observed) deep seafloor arrivals correspond to the sea surface reflection of an out-of-plane diffraction from a seamount that protrudes to about 4100 m depth and is about 18 km from the receivers. This out-of-plane bottom-diffracted surface-reflected energy is observed on the deep vertical line array about 35 dB below the peak amplitude arrivals and was previously misinterpreted as in-plane bottom-reflected surface-reflected energy. The structure of these arrivals from 500 to 3200 km range is remarkably robust. The bottom-diffracted surface-reflected mechanism provides a means for acoustic signals and noise from distant sources to appear with significant strength on the deep seafloor.
    Description: The OBS/Hs used in the LOAPEX field program were provided by Scripps Institution of Oceanography under the U.S. National Ocean Bottom Seismic Instrumentation Pool (SIO-OBSIP, http:// www.obsip.org). The OBS/H deployments themselves were co-funded through direct funding to SIO-OBSIP by the National Science Foundation and by Woods Hole Oceanographic Institution under a grant from the WHOI Deep Ocean Exploration Institute. The LOAPEX source deployments and the moored DVLA receiver deployments were funded by the Office of Naval Research under Award Nos. N00014-03-1-0181 and N00014-03-1-0182. The data reduction and analysis in this paper were funded by the Office of Naval Research under Award Nos. N00014-06-1-0222 and N00014-10-1-0510. Additional post-cruise analysis support was provided to RAS through the Edward W. and Betty J. Scripps Chair for Excellence in Oceanography.
    Keywords: Acoustic arrays ; Acoustic noise ; Acoustic signal processing ; Acoustic wave reflection ; Acoustic wave velocity ; Long-range order ; Ocean waves ; Seafloor phenomena ; Seismometers ; Surface acoustic waves ; Surface energy ; Underwater acoustic propagation
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 3
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    Mode filters and energy conservation (2010)
    Acoustical Society of America
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Acoustical Society of America, 2010. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 127 (2010): EL185-EL191, doi:10.1121/1.3327240.
    Description: The discrete form of the mode filtering problem is considered. The relevant equations constitute a linear inverse problem. Solutions to problems of this type are subject to a well-known trade-off between resolution and precision. But unlike the typical linear inverse problem, the correctly formulated mode filtering problem is subject to an energy conservation constraint. This letter focuses on the importance of satisfying, approximately at least, the energy conservation constraint when mode filtering is performed.
    Description: This work was supported by the Office of Naval Research, Code 321, Grant Nos. N000140610245 and N000140810195.
    Keywords: Acoustic signal processing ; Filters ; Underwater acoustic propagation
    Repository Name: Woods Hole Open Access Server
    Type: Article
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