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Browsing Applied Ocean Physics and Engineering (AOP&E) by Title

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Browsing Applied Ocean Physics and Engineering (AOP&E) by Title

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  • Buck, John R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-06)
    The shallow water acoustic channel supports far-field propagation in a discrete set of modes. Ocean experiments have confirmed the modal nature of acoustic propagation, but no experiment has successfully excited only one ...
  • Hartsfield, J. Carl (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2005-08)
    A detailed study was conducted to prove the concept of an iterative approach to single transponder navigation for REMUS Autonomous Underwater Vehicles (AUVs). Although the concept of navigation with one acoustic beacon ...
  • Hajosy, Michael F. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1994-09)
    Closed loop control of an unmanned underwater vehicle (UUV) in the dynamically difficult environment of shallow water requires explicit consideration of the highly coupled nature of the governing non-linear equations of ...
  • Stow, Craig A.; Jolliff, Jason; McGillicuddy, Dennis J.; Doney, Scott C.; Allen, J. Icarus; Friedrichs, Marjorie A. M.; Rose, Kenneth A.; Wallhead, Philip (2008-03-04)
    Coupled biological/physical models of marine systems serve many purposes including the synthesis of information, hypothesis generation, and as a tool for numerical experimentation. However, marine system models are ...
  • Duda, Timothy F.; Lynch, James F. (Woods Hole Oceanographic Institution, 1991-06)
    A group of amplitude and frequency modulated signals which generate narrow synthesized pulses and which also have smoothly varying phase are described. The frequency-sweep (chirp) signals have exactly-defined frequency ...
  • Harvey, Mike J.; Law, Cliff S.; Smith, Murray J.; Hall, Julie A.; Abraham, Edward R.; Stevens, Craig L.; Hadfield, Mark G.; Ho, David T.; Ward, Brian; Archer, Stephen D.; Cainey, Jill M.; Currie, Kim I.; Devries, Dawn; Ellwood, Michael J.; Hill, Peter; Jones, Graham B.; Katz, Dave; Kuparinen, Jorma; Macaskill, Burns; Main, William; Marriner, Andrew; McGregor, John; McNeil, Craig L.; Minnett, Peter J.; Nodder, Scott D.; Peloquin, Jill; Pickmere, Stuart; Pinkerton, Matthew H.; Safi, Karl A.; Thompson, Rona; Walkington, Matthew; Wright, Simon W.; Ziolkowski, Lori A. (2010-03-11)
    The SOLAS air-sea gas exchange experiment (SAGE) was a multiple-objective study investigating gas-transfer processes and the influence of iron fertilisation on biologically driven gas exchange in high-nitrate low-silicic ...
  • Foote, Kenneth G.; Hastings, Mardi C.; Ketten, Darlene R.; Lin, Ying-Tsong; Reidenberg, Joy S.; Rye, Kent (Acoustical Society of America, 2012-02)
    Potential physical effects of sonar transmissions on marine mammals were investigated by measuring pressure fields induced in a 119-kg, 211-cm-long, young adult male common dolphin (Delphinus delphis) cadaver. The specimen ...
  • Morozov, Andrey K.; Webb, Douglas C. (IEEE, 2003-07-09)
    Long-range underwater acoustic systems, such as those used in ocean acoustic tomography, require low-frequency signals covering a broad frequency band. To meet this requirement, a novel design based on of a tunable ...
  • Sikora, Joseph J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2005-09)
    This thesis develops and utilizes a method for analyzing data from the North Pacific Acoustic Laboratory's (NPAL) Basin Acoustic Seamount Scattering Experiment (BASSEX). BASSEX was designed to provide data to support the ...
  • DiPerna, Daniel T. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1993-10)
    This thesis investigates a new method for predicting the farfield scattered pressure of a plane wave due to an infinite cylinder of noncircular cross section. Both impenetrable and penetrable :fluid boundary condi tions ...
  • Wiebe, Peter H.; Greene, Charles H.; Stanton, Timothy K.; Burczynski, Janusz (Acoustical Society of America, 1990-11)
    Measurements and analyses are presented of the backscattering of 420-kHz sound by 43 individual animals of representative zooplanktonic and micronektonic taxa. Direct measurements of an individual's target strength were ...
  • Stanton, Timothy K.; Chu, Dezhang (Acoustical Society of America, 1992-09)
    Sonar echoes from unresolved features of rough objects tend to interfere with each other. Because of these interferences, properties of the echoes, such as its envelope level, will vary from realization to realization of ...
  • Stanton, Timothy K. (Acoustical Society of America, 1992-09)
    By use of the recently published deformed cylinder formulation [T. K. Stanton, J. Acoust. Soc. Am. 86, 691–705 (1989)], the scattered field due to rough elongated dense elastic objects is derived. The (one-dimensional) ...
  • Stanton, Timothy K.; Chu, Dezhang; Wiebe, Peter H.; Martin, Linda V.; Eastwood, Robert L. (Acoustical Society of America, 1998-01)
    The acoustic scattering properties of live individual zooplankton from several gross anatomical groups have been investigated. The groups involve (1) euphausiids (Meganyctiphanes norvegica) whose bodies behave acoustically ...
  • Stanton, Timothy K.; Chu, Dezhang; Wiebe, Peter H. (Acoustical Society of America, 1998-01)
    Mathematical scattering models are derived and compared with data from zooplankton from several gross anatomical groups—fluidlike, elastic shelled, and gas bearing. The models are based upon the acoustically inferred ...
  • Stanton, Timothy K. (Acoustical Society of America, 1990-09)
    Describing the scattering of sound by elongated objects with high aspect ratios (ratio of length to diameter) usually involves great numerical difficulties. The recently developed deformed cylinder solution was shown to ...
  • Orr, Marshall H.; Pasewark, Bruce H.; Wolf, Stephen N.; Lynch, James F.; Schroeder, Theodore; Chiu, Ching-Sang (IEEE, 2004-10)
    The temporal variability of the spatial coherence of an acoustic signal received on a bottomed horizontal array has been calculated for 276-Hz narrow-band signals. A conventional plane wave beamformer was applied to the ...
  • Walter, Matthew R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-02)
    This thesis formulates an estimation framework for Simultaneous Localization and Mapping (SLAM) that addresses the problem of scalability in large environments. We describe an estimation-theoretic algorithm that achieves ...
  • Berger, Christian R.; Zhou, Shengli; Preisig, James C.; Willett, Peter (IEEE, 2009-10-29)
    In this paper, we investigate various channel estimators that exploit channel sparsity in the time and/or Doppler domain for a multicarrier underwater acoustic system. We use a path-based channel model, where the channel ...
  • Frosch, Robert A. (2011-08-25)
    This paper discusses a simple problem in detection theory using a model with a simple discretized space. This allows the probability problem to be analyzed algebraically to demonstrate that separate targets, independent ...

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