Now showing items 1-20 of 59

  • Acoustic classification of zooplankton 

    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. ...
  • Acoustic diffraction from a semi-infinite elastic plate under arbitrary fluid loading with application to scattering from Arctic ice leads 

    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 ...
  • Acoustic mode coherence in the Arctic Ocean 

    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 ...
  • Acoustic scattering by axisymmetric finite-length bodies with application to fish : measurement and modeling 

    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 ...
  • Acoustic tomography in the Straits of Florida 

    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 ...
  • Algorithm for computation of the acoustic plane-wave reflection coefficient of the ocean bottom 

    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 ...
  • Ambient noise and surface wave dissipation in the ocean 

    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 ...
  • Analysis of acoustic communication channel characterization data in the surf zone 

    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 ...
  • Analysis of acoustic propagation in the region of the New England continental shelfbreak 

    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 ...
  • Analysis of internal wave induced mode coupling effects on the 1995 SWARM experiment acoustic transmissions 

    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 ...
  • Analysis of seismo-acoustic emission from ice fracturing events during SIMI’94 

    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 ...
  • Basin-scale tidal measurements using acoustic tomography 

    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 ...
  • A beam pattern design procedure for multidimensional sonar arrays empolying minimum variance beamforming 

    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 ...
  • A channel subspace post-filtering approach to adaptive equalization 

    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 ...
  • Design and testing of an acoustic ultra-short baseline navigation system 

    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 ...
  • Direct-form adaptive equalization for underwater acoustic communication 

    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 ...
  • A distributed approach to underwater acoustic communications 

    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 ...
  • Distribution, patchiness, and behavior of Antarctic zooplankton, assessed using multi-frequency acoustic techniques 

    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 ...
  • Echolocation-based foraging by harbor porpoises and sperm whales, including effects of noise and acoustic propagation 

    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 ...
  • The effect of internal waves on long range acoustic propagation in the ocean 

    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 ...