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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
  • Marine fouling of optical fibre micro-cables

    Publication Year: 1997, Page(s):951 - 956 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    The benefits of optical fibre as a data transfer medium are well established and exploited within numerous current applications, where high data rates and minimal cable diameters are required. Data rate requirements in excess of 1 Gbaud, to support the transmission of advanced sensor data, are achievable through single mode optical fibre cables, which may be as small as 0.25 mm outer diameter. Thi... View full abstract»

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  • Bottom detection for multibeam sonars with active contours

    Publication Year: 1997, Page(s):943 - 950 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    In multibeam sonar bathymetry, a receiving array is used to form a fan-shaped beam sector. Bottom echoes of near-normal incident angles are usually detected based on the amplitude of the received signal. To detect bottom echoes of oblique incident angles, it is common to use the phase information obtained by subarray interferometry. The type of the bottom echo is not known a priori. Hence, which o... View full abstract»

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  • Real-time bathymetric artifact flagging for the SeaBeam 2100 system

    Publication Year: 1997, Page(s):939 - 942 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    An algorithm for flagging anomalous multibeam data in real-time is presented. Requirements for the design were the ability to perform effectively in the varying depths and seafloor conditions the SeaBeam 2100 system may encounter without slowing real-time data processing or flagging more than 5% of the good beams in the data. The algorithm consists of three filters: (1) Cross Track Distance, (2) S... View full abstract»

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  • Interactive 3D tools for pipeline route planning

    Publication Year: 1997, Page(s):1216 - 1221 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1220 KB)

    With their ability to efficiently provide high-resolution bathymetry with complete coverage over wide swaths of the seafloor, multibeam sonars are increasingly becoming a standard tool for the planning of marine engineering projects such as pipelines and communication cables. In addition to high-resolution bathymetry, most modem multibeam sonar systems also provide sonar backscatter data, an indic... View full abstract»

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  • Multibeam sonar bottom detection using multiple subarrays

    Publication Year: 1997, Page(s):932 - 938 vol.2
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    Two new bottom detection methods for multibeam bathymetric sonars are presented. Both of the methods are based on the early separate aperture method which combines amplitude and phase in the bottom detection. As a generalization of the separate aperture method, multiple subarrays are used to estimate the direction of arrival of the bottom echoes of oblique incident angles. An image transform is us... View full abstract»

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  • Detecting small seabed targets using a high frequency multibeam sonar: geometric models and test results

    Publication Year: 1997, Page(s):815 - 819 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1276 KB)

    The detection of small seabed targets has predominantly been achieved through the use of deep-towed side scan sonar technology. The target cannot be relied on to have distinctive backscatter strength but usually lies proud of the seabed, thus casting a shadow. Such technology fails at higher grazing angles where shadows are no longer cast. Thus repetitive, overlapping survey geometries are require... View full abstract»

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  • Applications of 3-D visualizations of oceanographic data bases

    Publication Year: 1997, Page(s):1210 - 1215 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1696 KB)

    Creative use of 2D techniques in oceanographic data analysis has proven sufficient for many tasks of analysis, review, and planning. Often, however, a greater understanding of a data set and reduced analysis time can be achieved by supplementing traditional methods with 3D visualization and display techniques. Virtual-environment visualization of 3D surfaces offers a means to review large ocean ar... View full abstract»

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