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Browsing WHOI Theses by Keyword "Underwater acoustics"

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Browsing WHOI Theses by Keyword "Underwater acoustics"

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  • Martin Traykovski, Linda V. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-02)
    Work on the forward problem in zooplankton bioacoustics has resulted in the identification of three categories of acoustic scatterers: elastic-shelled (e.g. pteropods), fluid-like (e.g. euphausiids), and gas-bearing (e.g. ...
  • Dahl, Peter H. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1989-05)
    The problem of a low-frequency acoustic plane wave incident upon a free surface coupled to a semi-infinite elastic plate surface, is solved using an analytic approach based on the Wiener-Hopf method. By low-frequency it ...
  • Polcari, John J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1986-05)
    The dual issues of modal decomposition for tonal sound fields and the temporal coherence of the modal amplitudes are investigated for the case of the central Arctic sound channel at very low frequencies (15-80 Hz). A ...
  • Reeder, D. Benjamin (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-06)
    This thesis investigates the complexities of acoustic scattering by finite bodies in general and by fish in particular through the development of an advanced acoustic scattering model and detailed laboratory acoustic ...
  • Chester, David B. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1989-09)
    Variability of the Florida Current has been monitored via acoustic tomography. A reciprocal tomography experiment was conducted in the eastern half of the Florida Straits during mid October and November, 1983. A triangular ...
  • Martinez, David Richard (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1979-06)
    For a spherical acoustic wave incident on a horizontally stratified ocean bottom, the reflected pressure field and the plane-wave reflection coefficient are related through a two-dimensional spatial-wavenumber Fourier ...
  • Felizardo, Francis C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1993-06)
    There is a growing consensus that the sound generated by breaking waves is responsible for much of the ambient noise level in the ocean. While numerous field measurements have shown a strong correlation between the ambient ...
  • Partan, James W. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-09)
    A channel characterization experiment for the underwater acoustic communication channel was carried out at Scripps Pier in May 1999. The experiment investigated acoustic transmission in very shallow water and breaking ...
  • Sperry, Brian J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1999-06)
    During July and August of 1996, a large acoustics/physical oceanography experiment was fielded in the Mid-Atlantic Bight, south of Nantucket Island, MA. Known as the Shelfbreak Front PRIMER Experiment, the study combined ...
  • Headrick, Robert H. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-06)
    As part of the Shallow Water Acoustics in a Random Medium (SWARM) experiment [1], a sixteen element WHOI vertical line array (WVLA) was moored in 70 meters of water off the New Jersey coast. This array was sampled at ...
  • Dudko, Yuriy V. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1999-02)
    In this thesis the analysis of natural ice events is carried out based on direct measurements of ice-borne seismo-acoustic waves generated by ice fracturing processes. A major reason for studying this phenomenon is that ...
  • Headrick, Robert H. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-09)
    Travel-times of acoustic signals were measured between a bottom-mounted source near Oahu and four bottom-mounted receivers located near Washington, Oregon, and California in 1988 and 1989. This paper discusses the observed ...
  • Richards, Randall G. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-09)
    This paper develops a beam pattern design procedure for general multidimensional irregular sonar arrays that incorporates the not well understood effects of array geometry into the design process. The procedure is ...
  • Nadakuditi, Rajesh Rao (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-02)
    One of the major problems in wireless communications is compensating for the time-varying intersymbol interference (ISI) due to multipath. Underwater acoustic communications is one such type of wireless communications ...
  • Tracey, Brian H. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1992-09)
    An ultra-short baseline acoustic navigation system has been developed which is capable of determining bearing to a sound source with an error of less than 1° in typical operational conditions. The system has a demonstrated ...
  • Yellepeddi, Atulya (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-06)
    Adaptive equalization is an important aspect of communication systems in various environments. It is particularly important in underwater acoustic communication systems, as the channel has a long delay spread and is ...
  • Bohner, Christopher George (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-09)
    A novel distributed underwater acoustic networking (UAN) protocol suitable for ad-hoc deployments of both stationary and mobile nodes dispersed across a relatively wide coverage area is presented. Nodes are dynamically ...
  • Lawson, Gareth L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-09)
    The physical and biological forces that drive zooplankton distribution and patchiness in an antarctic continental shelf region were examined, with particular emphasis on the Antarctic krill, Euphausia superba. This was ...
  • DeRuiter, Stacy L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-09)
    In this thesis, I provide quantitative descriptions of toothed whale echolocation and foraging behavior, including assessment of the effects of noise on foraging behavior and the potential influence of ocean acoustic ...
  • Jaffee, Richard Jay (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1976-05)
    The acoustic-internal wave interaction in an acoustic waveguide is investigated using wave techniques. Refractive index fluctuations due to the vertical displacements of the internal waves create an inhomogeneous ...

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