OCEANS '97. MTS/IEEE Conference Proceedings

6-9 Oct. 1997

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  • MTS/IEEE Conference Proceedings Oceans '97 [front matter]

    Publication Year: 1997, Page(s):i - xx
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    Freely Available from IEEE
  • Two inversion methods for ocean acoustic tomography

    Publication Year: 1997, Page(s):743 - 747 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (578 KB)

    This study deals with the inverse problem in ocean acoustic tomography. Given the characteristics of the transmitted and received signal, the inverse problem demands calculation of the ocean properties, characterized by the speed of sound. To simplify the problem, the authors consider a range independent environments (the sound speed only depends on depth). They propose two different approaches to... View full abstract»

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  • Analysis of wind measurements from a moored buoy

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (43 KB)

    Summary form only given. The wind data from remotely located heave-pitch-roll buoy stations operated by the National Data Buoy Center (NDBC) have both climatological and operational uses. In this study, the author investigated the wind measurements and its relation to buoy motions during severe seas. Wind data were collected from a NDBC 3-m heave-pitch-roll discus buoy during high seas caused by t... View full abstract»

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  • Experimental set up for the artificial generation of well defined microstructures for calibration of oceanographical microstructure probes

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (30 KB)

    Summary form only given. During the last decades microstructure research in the oceans became increasingly important. For this field of measurements new types of very sensitive sensors were created, highly resolving in space and time. To tackle the associated sensor calibration problems down to sub millimeter scales, special experimental set ups have been designed, particularly, for example, to pr... View full abstract»

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  • Multi-sensor instrumentation on a FOCUS-1500 search and survey system

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (38 KB)

    Summary form only given. A FOCUS-1500 ROTV has been fully instrumented for deep water search and survey applications using acoustic, optical and magnetic sensors for operations to 1500 meter water depth. The recent deployments of the system mark a number of firsts for deep water applications, including deepest operation of the FOCUS vehicle; deepest operation of a laser line scan system; deepest o... View full abstract»

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  • Coral Reef Curricular Materials Translation Project

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (59 KB)

    Summary form only given. The geographic regions in closest proximity to this planet's coral reef ecosystems are comprised by a large population of Spanish-speaking people. It is important that the classroom teachers in these areas have access to the plethora of information contained in the latest research and curricular materials, many of which are currently published only in English. The "Coral R... View full abstract»

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  • Satellite radar scatterometer (NSCAT) studies of ocean surface stress in near coastal regions

    Publication Year: 1997
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    Summary form only given. This study addresses the consistency of the surface friction velocity derived from the scatterometer normalized radar cross section (NRCS) measurements and the directional properties of the NRCS (SIGMA-O) measurements in near coastal regions. NSCAT data (Level 1.7) colocated with numerous NDBC buoys is being analyzed to determine the variability of the directional properti... View full abstract»

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  • 1-3 piezocomposites, SonoPanels, arrays, and SmartPanels

    Publication Year: 1997
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (62 KB)

    Summary form only, given as follows. 1-3 piezoelectric ceramic-polymer composites are finding many applications for underwater sensing, actuation, imaging, and active surface control. The Materials Systems' lead zirconate titanate (PZT) injection moulding process has made 1-3 piezocomposites commercially available and cost-competitive with traditional materials. Piezocomposites offer a number of p... View full abstract»

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  • Design of a hydrophone array for littoral waters

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (46 KB)

    Summary form only given. This presentation documents the engineering effort, fabrication, and subsequent calibration results of a line array, USRD type F81, currently used by the U.S. Navy to collect acoustic data in littoral waters. Littoral waters present a complicated acoustic environment, but measurement difficulties can be minimized by using a transducer or array configuration designed for th... View full abstract»

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  • Three dimensional visualization of oceanographic data: a case study of the Gulf of Mexico's coastal interface with Texas and Louisiana

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    Summary form only given. The current state-of-the-art 3D scientific visualization, as applied to coastal ocean data, is discussed. The significance of 3D animation, videography, and virtual reality techniques, as tools for the analysis of littoral phenomena, is examined. Constraints to integrating scientific visualization within coastal ocean modeling and possible integrative solutions are identif... View full abstract»

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  • Application of a parametric source for sediment characterisation and object detection

    Publication Year: 1997
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (38 KB)

    Summary form only given. Parametric acoustic sources have been used in conventional sub-bottom profiling operation for some time. Due to their narrow acoustic beam, well defined signature and high relative bandwidth, very high spatial resolution can be achieved. These features will also be of interest in applications such as sediment characterisation, object detection and classification. In the MA... View full abstract»

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  • Characterisation of iceberg pits on the Grand Banks of Newfoundland

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (87 KB)

    Summary form only, substantially as follows. Numerous studies of the eastern Canadian continental shelves have indicated the presence of seabed features formed through iceberg impact processes. These features range from long, shallow scour furrows many kilometres in length to circular or elliptical pits or craters incised into the seabed. Exploration and development of Canada's offshore hydrocarbo... View full abstract»

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  • Dead reckoning with an ADCP and current extrapolation

    Publication Year: 1997
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (73 KB)

    Summary form only given, substantially as follows. For many years, oceanographers have navigated vessels by dead-reckoning techniques using raw frequency shift data from a bottom-tracking Doppler sonar velocity log (DSVL) and heading data from a gyro-compass. These data have been combined through the standard Janus equations to yield the horizontal velocities of the vessel. A more accurate three-d... View full abstract»

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  • Commercial and scientific applications of deep towed sidescan sonar systems

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (38 KB)

    Summary form only. The collection of seafloor imagery and bathymetry from 6000 meter rated deep-towed sidescan sonar systems has been appreciated for many years. The number of systems in active use in the commercial, scientific, and government communities continues to increase. New improvements to these systems include additional sub-systems such as gap-filler sonars, integrated CTDs and improved ... View full abstract»

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  • An electronic navigational aid for pilots-designed by pilots

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (78 KB)

    Summary form only given, substantially as follows. There have been significant advances in wireless communications as well as increased utilization of the Global Positioning System (GPS) for commercial navigation systems. A major component in maritime applications of these technologies is a portable shipboard system that provides more that own-ship position. In addition to their own ship, users wa... View full abstract»

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  • World geodetic system 1984-a summary of enhancements through the development of the new geopotential model EGM96

    Publication Year: 1997
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (76 KB)

    Summary form only given, substantially as follows. EGM96 is a geopotential model of the Earth consisting of spherical harmonic coefficients complete to degree and order 360. This model is the result of a collaboration between the National Imagery and Mapping Agency, the NASA Goddard Space Flight Center and the Ohio State University, supported by the Naval Surface Warfare Center. The joint project ... View full abstract»

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  • Snow thickness radar system

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (30 KB)

    Summary form only given. A real-time snow thickness radar system is to be test flown in March 1997. This system is designed to be an additional sensor for the Canadian Coast Guard's Ice Probe real-time ice thickness sensor. The system has been developed around the GSSI 500 MHz ground penetrating radar system. This commercial system has been extensively modified to build-in to the radar package the... View full abstract»

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  • Author index

    Publication Year: 1997, Page(s):1507 - 1510
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    Freely Available from IEEE
  • Deep water bottom-track ship's velocities from an acoustic correlation current profiler

    Publication Year: 1997, Page(s):1404 - 1410 vol.2
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    Acoustic Doppler logs have a typical bottom-tracking range of 500 m; whilst this is perfectly adequate for use on continental shelves, it is clearly inadequate for use in the deep ocean. Doppler logs use narrow beams requiring large transducers at the low frequencies necessary for long range. In contrast acoustic correlation logs can use smaller, lighter and less expensive low frequency transducer... View full abstract»

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  • A model of wave propagation over a sloping bottom

    Publication Year: 1997, Page(s):1399 - 1403 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The propagation of water waves over a sloping beach is known as subject of considerable practical interest. A number of theoretical approaches yielded to exact or approximate solutions of the governing equations under more or less simplified circumstances (Miche (1945), Stoker (1947), ...). Most of these solutions are so complicated and are useless in practice. In this work, te author developed a ... View full abstract»

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  • Towards development of autofocusing schemes for phase compensation of synthetic aperture sonars

    Publication Year: 1997, Page(s):803 - 808 vol.2
    Cited by:  Papers (6)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    This article is dedicated to the phase compensation problem associated with synthetic aperture sonar beamforming. Array movements during the time of synthesis and medium heterogeneity have to be compensated at a degree of accuracy of a fraction of wavelength to achieve the full resolution expected from theory. We present a phase noise correction scheme based on 2D correlations of conventional beam... View full abstract»

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  • Prediction of sea ice movement using satellite data

    Publication Year: 1997, Page(s):1297 - 1302 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    The ice condition in marginal ice zone varies with the wind and current day by day. This paper presents a simulator for use in the short-term (order of several days) prediction of ice condition in marginal ice zone with the use of satellite data. The sea ice data which were obtained from satellite remote sensing with passive microwave sensor SSM/I were used for the initial conditions of simulation... View full abstract»

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  • Seabottom roughness measurement by aquatic walking robot

    Publication Year: 1997, Page(s):1395 - 1398 vol.2
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Port construction works in Japan are now being done in deeper sea areas than before. Flattening of the rubble mound foundation in these deeper areas are carried out by machines because human divers' working time is very short at these depths. The authors developed a six-legged aquatic walking robot for underwater inspection. The robot named “AQUAROBOT” is navigated by an LBL ultrasonic... View full abstract»

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  • Iceberg tracking using HF surface wave radar

    Publication Year: 1997, Page(s):1290 - 1296 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    An iceberg surveillance experiment involving multiple sensors was carried out in a one-week period between April and May, 1995. Several Canadian and U.S. Agencies and members of industry participated The Canadian Department of National Defence, in collaboration with industry provided high-frequency surface-wave radar (HFSWR) sensors, while the Canadian and U.S. Coast Guards collected surface and a... View full abstract»

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  • The drifting, rotating deep-ocean shearmeter

    Publication Year: 1997, Page(s):796 - 801 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    The shearmeter is a new member of the family of neutrally-buoyant subsurface Lagrangian floats (Swallow floats). It is a 10-m spar buoy with anemometer-type vanes rigidly mounted at each end, designed so that opposed horizontal flow at the ends due to shear causes the entire instrument to rotate. The vanes must provide torque at very low flow speed, so design work has included tank testing of comp... View full abstract»

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