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OCEANS '98 Conference Proceedings

Date Sept. 28 1998-Oct. 1 1998

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  • OCEANS '98 [front matter]

    Publication Year: 1998, Page(s):i - viii
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    Freely Available from IEEE
  • Table of contents

    Publication Year: 1998, Page(s):ix - xxxi
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  • Romeo goes to Antarctica [unmanned underwater vehicle]

    Publication Year: 1998, Page(s):1568 - 1572 vol.3
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1065 KB)

    Deals with the first operational campaign of Romeo, the latest unmanned underwater vehicle developed at CNR-IAN. Romeo has been designed as an operational testbed to perform research on intelligent vehicles in the real subsea environment. Its main application field is the development of advanced methodologies for marine science. A brief description of the mechanical design and of the control, comp... View full abstract»

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  • Index [of authors]

    Publication Year: 1998, Page(s):0_2 - 0_5
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  • Optimal control of a deep-towed vehicle by optimization techniques

    Publication Year: 1998, Page(s):1634 - 1639 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    We consider the problem of controlling a subsea vehicle used to investigate the ocean floor and focus on deep-ocean systems deployed through a cable several thousand meters long. The objective is to evolve optimized orders to be sent to the bridge or directly to the ship dynamic positioning system in order to minimize the duration of non-productive maneuvers. Various constraints acting on the vehi... View full abstract»

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  • Shallow water predictions and HF radar wave measurements in coastal areas

    Publication Year: 1998, Page(s):1666 - 1670 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    This paper presents some initial comparisons between HF radar wave measurements and SWAN shallow water wave model results. The comparisons involve fetch limited wave growth and long fetch wave growth scenarios. These allow a simple visual assessment of the results. The HF radar measurements and SWAN results are comparable, although the former contains some spurious measurements, mainly in the near... View full abstract»

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  • DSP hardware implementation of transform-based compression algorithm for AUV telemetry

    Publication Year: 1998, Page(s):1624 - 1628 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    Operation of AUVs or other platforms that rely upon robust communications for navigation and mission critical tasks is facilitated by the use of on-board data compression. Data compression eliminates redundancy of transmitted information and therefore improves the efficiency of the entire mission. In some applications, acoustic and non-acoustic sensor information is acquired and processed to produ... View full abstract»

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  • Temperature changes of the detectibility of sea background slight-contrastic anomalous radar formations in sea surface radar sensing

    Publication Year: 1998, Page(s):1661 - 1665 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    Temperature changes of detection probabilities of slight-contrast radar anomalous formations originating on the background of sea surface due to the changes of sea wave parameters are considered View full abstract»

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  • Monitoring of oceanic surface features in the central and south-western Kara Sea using NOAA-AVHRR imagery

    Publication Year: 1998, Page(s):1657 - 1660 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    Advanced Very High Resolution Radiometer satellite data were used to investigate marine environment study in the central and south-western Kara sea. Imagery shows that the whole sea is covered by ice most of the year. The influence of the Ob' and Enisej rivers discharge, as well as the entrance of an upward flux of warm Atlantic-originated water is clearly seen in the central part of the sea. By e... View full abstract»

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  • High resolution spectrum estimating algorithm

    Publication Year: 1998, Page(s):1409 - 1412 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A high-resolution spectrum estimating algorithm has been developed. The proposed algorithm is based on approximation of maximum likelihood criterion, which leads to two-channel structure of the estimation filter. The first channel corresponds to a measuring channel like one of Capon's algorithm, and the second one is using for taking into account and compensation of non-coherent white noise compon... View full abstract»

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  • Autonomous navigation of the free-swimming vehicle SIRENE

    Publication Year: 1998, Page(s):1650 - 1654 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The project DESIBEL, funded by the European Union (MAST-2 programme), included development of the underwater vehicle demonstrator SIRENE. The free-swimming, acoustically, remotely operated vehicle is designed to place and recover deep-sea measuring stations on the sea-floor. The acoustic data link allows one to monitor the vehicle state from the surface and to send guidance commands. The positioni... View full abstract»

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  • Virtual reality simulation testbed for underwater environments

    Publication Year: 1998, Page(s):1392 - 1396 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Describes an application of the high level architecture (HLA) for simulation of an underwater environment. Models of the environment and underwater vehicles are developed based on the HLA object model template (OMT) and some existing models in the HLA object model library. A virtual reality based user interface has been developed and some standardization efforts using virtual reality modeling lang... View full abstract»

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  • Subsea instrument deployments: methodology and techniques using a work class remotely operated vehicle (ROV)

    Publication Year: 1998, Page(s):1589 - 1593 vol.3
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    The conventional deployment of sensors and data-logging equipment by free fall from the ocean's surface is fraught with many technical problems, including unpredictable instrument placement, lack of control over site selection, unreliable instrument orientation, lack of communications with the instrument during deployment, and short measurement duration due to limited battery power. Through severa... View full abstract»

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  • The advantage of rubble mound roughness measurement by walking robot

    Publication Year: 1998, Page(s):1230 - 1232 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The advantage of the measurement of rubble mound roughness by leg motion of a walking robot is that it is not affected by long-period waves. Using a pressure gauge alone, it takes long time to measure the accurate depth. The combination of a pressure gauge and leg motion is one solution. At the starting and stopping points, measure the water pressure for a time enough to eliminate the affect of lo... View full abstract»

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  • Sub-bottom characterisation using a parametric sonar

    Publication Year: 1998, Page(s):1828 - 1832 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    High quality seabed data are needed in many situations connected with marine surveillance and monitoring. At FOA we are developing remote sensing methods, which use a parametric sonar. It has a very small footprint, which means that individual small objects can be detected and separated. The sonar can be operated with broadband signals, which gives good resolution in the time domain. We have used ... View full abstract»

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  • Estimating hurricane storm surge amplitudes for the Gulf of Mexico and Atlantic coastlines of the United States

    Publication Year: 1998, Page(s):1301 - 1305 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    Whenever a hurricane threatens to strike a coast, it is desirable to have an estimate of the height of the peak storm surge. Jelesnianski combined empirical data from Conner, et al., and Harris with his theoretical calculations to produce a set of nomograms that permit the estimation of peak surge for any geographical location when a few parameters characterizing a storm are known. Russo has used ... View full abstract»

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  • A quantitative stereoscopic video system for visually measuring the linear dimensions of free-swimming fish

    Publication Year: 1998, Page(s):1405 - 1408 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    A photogrammetric technique is described that can be applied to the problem of measuring the linear dimensions of free-swimming salmon contained in aquaculture pens. These dimensions are then used to statistically estimate the animal's weight. The system is non-invasive and is small and logistically easy to deploy from small boats. The system employs a very simple stereoscopic calculation that is ... View full abstract»

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  • On-line monitoring of biofilm and TRO by a new ENEL's system

    Publication Year: 1998, Page(s):1507 - 1511 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    To improve the chlorination treatments of steam condenser cooling sea water, ENEL has recently set up an innovative electrochemical system which monitors, online, the biofilm growth and the concentration of effective TRO (total residual oxidane) diffusing toward the sensor surface. This system utilises a probe installed in a suitable way in the sea water cooling circuit and processes its response ... View full abstract»

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  • Robust control of underwater vehicles: sliding mode control vs. mu synthesis

    Publication Year: 1998, Page(s):1640 - 1644 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Presents the results of a controller synthesis where a robust control of an AUV is developed using two different methods. The problem statement requires the design of a position and attitude control system for the vehicle in order to achieve precise trajectory following. Firstly, a detailed nonlinear model of the vehicle was derived. Secondly an operating point for nominal design was selected, and... View full abstract»

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  • Underwater vehicle synthetic environment demonstration: an overview

    Publication Year: 1998, Page(s):1387 - 1391 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The use of synthetic environments (SE) and network technologies such as the World Wide Web (WWW) enable information from distributed simulations to be integrated, visualised, manipulated and interacted with in near real time in a virtual world. This capability enables underwater system designs and concepts to be comprehensively prototyped, tested, verified and validated in a virtual world before m... View full abstract»

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  • A specialized ROV for inspection of salt dome caverns

    Publication Year: 1998, Page(s):1584 - 1588 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    An underwater remotely operated vehicle was designed to enter a solution-mined cavern in the Clovelly salt dome in southern Louisiana to survey the condition of its interior, take core samples, and restore its structural integrity using a new gel technology. Preliminary experiments were conducted to determine the operating environment inside the cavern. The resulting vehicle system was deployed in... View full abstract»

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  • Coastal oil pollution prediction by a tanker using cellular automata

    Publication Year: 1998, Page(s):1324 - 1328 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    This paper describes a new simulation technique for diffusion phenomena over the sea surface using cellular automata, which is capable of making prediction of oil dispersion from tankers come into collision or stranded on rocks. Cellular automata is applied to solve a diffusion equation, in which the simulation results are compared with the analytical solution, and the applicability is shown in pr... View full abstract»

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  • Development of a non-acoustic sensor platform (NASP)

    Publication Year: 1998, Page(s):1224 - 1229 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    DERA are currently addressing the potential use of non-acoustic sensors for mine detection. Initial work has primarily concentrated on the development of a low cost 3-axis magnetic gradiometer, an electro-optic system and an olfactory sensor. In addition, a Non-Acoustic Sensor Platform (NASP) has been developed which enabled sensors to be tested against mine like targets in Portland Harbour during... View full abstract»

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  • Relative orientation and roto-rectification of stereoscopic underwater images

    Publication Year: 1998, Page(s):1473 - 1476 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    This work has been developed under the scope of a stereo vision project for autonomous underwater vehicles (so called AUV). Our solution consists in a vehicle provided with two optical sensors, emulating the binocular system of human beings. In order to obtain better precision for the numerical model of a subaquatic scene, calculus are made from pairs of images before and after vehicle removal. Th... View full abstract»

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  • The limits of spatial resolution achievable using a 30 kHz multibeam sonar: model predictions and field results

    Publication Year: 1998, Page(s):1823 - 1827 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A Simrad EM300 multibeam sonar was used to attempt to resolve small (~5 m high) targets in 450 m of water. The targets had previously been surveyed using a deeply towed 59 kHz sidescan sonar. Using multisector active yaw, pitch and roll compensation, together with dynamically altering angular sectors, the sonar is capable of maintaining sounding densities of as tight as 10 m spacing in these water... View full abstract»

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