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OCEANS 2000 MTS/IEEE Conference and Exhibition. Conference Proceedings (Cat. No.00CH37158)

11-14 Sept. 2000

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  • Oceans 2000 MTS/IEEE Conference & Exhibition

    Publication Year: 2000, Page(s):v - lxxiii
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  • WaveView/sup TM/-computer software for processing, displaying and archiving data from the TRIAXYS/sup TM/ Directional Wave Buoy

    Publication Year: 2000
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (85 KB)

    Summary form only given, substantially as follows:- WaveView/sup TM/ was developed by Axys Environmental Systems to automatically decode the data transmitted from a TRIAXYS/sup TM/ Directional Wave Buoy into ASCII files. This innovative software program processes, displays, and archives data received from the buoy via the TRIAXYS/sup TM/ Digital Receiver. WaveView/sup TM/ runs on an lBM compatible... View full abstract»

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  • New developments at Service Argos

    Publication Year: 2000, Page(s):1879 - 1881 vol.3
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    summary form only. This article very briefly lists the oceanographic equipment and services provided by the company Service Argos Inc. ARGOS is a satellite radiotelemetry system for communication with ocean buoys. View full abstract»

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  • BAYLAB: a manned undersea instrument chamber

    Publication Year: 2000, Page(s):2005 - 2006 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (126 KB)

    Summary form only given, substantially as follows. BAYLAB is a small, easily transportable undersea habitat. It differs from other existing systems by placing habitability for instruments and electronic devices as a higher priority than that of the human occupants. For this reason it is called a manned undersea instrument chamber (MUSIC). It was designed for use in the shallow waters of the Chesap... View full abstract»

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  • New developments in expendable oceanographic sensors and data acquisition systems

    Publication Year: 2000, Page(s):1875 - 1877 vol.3
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    The ability to collect, process, display, distribute and store oceanographic data at sea in real time has always been critical to meet the ever changing environmental requirements of the tactical, scientific and commercial offshore communities. With the development of the expendable bathythermooraph (XBT) by Sippican, Inc. back in 1962, profiles of ocean temperature could be collected at ship spee... View full abstract»

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  • SAIC chart management system

    Publication Year: 2000, Page(s):1577 - 1579 vol.3
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    Telecommunication companies are competing more frequently each year for seafloor space near popular landing sites. The increased competition has effectively mandated to each marine survey and cable installation company that survey and installation results must be produced at an ever-increasing rate, allowing the new networks to start transmitting light and earning revenue as fast as possible. Data... View full abstract»

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  • Propulsion system performance enhancements on REMUS AUVs

    Publication Year: 2000, Page(s):1869 - 1873 vol.3
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    This paper details recent efforts on drag reduction, vehicle shape and propulsion system modifications, and propeller design for the REMUS class of autonomous underwater vehicles (AUV). Drag reduction was accomplished by tow-tank measurements of an existing design to itemize the sources of drag. The vehicle shape and main propulsion system were modified to use magnetic torque transfer through a se... View full abstract»

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  • Strategies for unwrapping multisensors interferometric side scan sonar phase

    Publication Year: 2000, Page(s):2059 - 2065 vol.3
    Cited by:  Papers (5)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    This paper concerns the description of a method of 2π bias removal for the interferometric phase. The first part is the description of different noise sources for interferometric side-scan sonar. In fact, these noise sources can generally be classified into two categories: a. environmental noise category (variable celerity, sonar motion, etc.), and, b. interferometric process related noise (dec... View full abstract»

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  • European marine information system: Eumaris prototype

    Publication Year: 2000, Page(s):1569 - 1575 vol.3
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    The present paper summarises the activities developed by ETC/MCE, under European Environment Agency (EEA) contract, on the geographic information system. The aim of present paper is to introduce some general concepts about the geographic information systems and to investigate the potential of GIS as tool for the assessment of the European seas. Care has also been taken to explain the main technica... View full abstract»

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  • Defining a common control language for multiple autonomous vehicle operation

    Publication Year: 2000, Page(s):1861 - 1867 vol.3
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Presents a communication and coordination approach associated with multiple autonomous systems operations. With the extension of autonomous operations to a heterogeneous group of vehicles and with the request from human operators for override control, the need for a common control language (CCL) to facilitate real-time control is critical. The primary goal is to establish a standard interface from... View full abstract»

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  • AUV positioning using bathymetry matching

    Publication Year: 2000, Page(s):2123 - 2127 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    A research concern in AUV positioning is the constraint of INS error growth; approaches to this include surfacing for GPS fixes, terrain matching methods and acoustic transponder systems. The paper presents a positioning technique for AUV's that exploits existing bathymetric data in an operation area. Unlike many terrain matching approaches, which do positioning using distinct ocean bottom feature... View full abstract»

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  • Real-time 3D path planning for sensor-based underwater robotics vehicles in unknown environment

    Publication Year: 2000, Page(s):2051 - 2058 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    Studies path planning strategies on real-time 3D near-shortest path planning for sensor-based underwater robotics vehicles (URV) in an unknown environment. The unknown environment includes multiple static obstacles of arbitrary shape. Based on limited sensor vision zone and the URV attitude dynamics, a 3D near-shortest path planning algorithm is developed for the URV in an unknown environment. The... View full abstract»

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  • Bottom classification in very shallow water

    Publication Year: 2000, Page(s):1563 - 1567 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Bottom classification based on echo features and multivariate statistics is now a well established procedure for habitat studies and other purposes, over a depth range from about 5 m to over 1 km. Shallower depths are challenging for several reasons. To classify in depths of less than a metre, a system has been built that acquires echoes at up to 5 MHz and decimates according to the acoustic situa... View full abstract»

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  • An automatic sea state calculator

    Publication Year: 2000, Page(s):1727 - 1734 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    The Sea State Code, an extension of the Beaufort Wind Scale that originated in the early 19th century, is a written description of the sea surface with a corresponding numeric code, which is used by seamen to describe sea surface conditions for ship routing, operational safety, and weather forecasting in the absence of wind and wave measuring instrumentation. Still in use today by the W... View full abstract»

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  • Mapping of geoacoustic properties of sediments in shallow water

    Publication Year: 2000, Page(s):1919 - 1922 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Range dependent geoacoustic properties of shallow water sediments were estimated using tomographic inversion techniques. Non-linear inversion schemes based on global optimization schemes were used. Synthetic data generated for assumed environmental conditions were analyzed using wavelets to obtain the modal arrivals for frequencies in the range 10-180 Hz. Data from a number of sources distributed ... View full abstract»

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  • Guidance algorithms for UUVs obstacle avoidance systems

    Publication Year: 2000, Page(s):1853 - 1860 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    To widen the range of application of underwater vehicles both in industrial application and in environmental survey, we need to design powerful robotic systems, exhibiting a maximum degree of autonomy. Ability to construct a reliable representation of the underwater environment, to plan viable trajectories leading to safe mission execution are of prime importance. Sonar is used. In this paper, we ... View full abstract»

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  • Circulation and pollutant transport modeling in Narragansett Bay

    Publication Year: 2000, Page(s):1695 - 1701 vol.3
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    Powerful PCs have made possible the efficient use of sophisticated two- and three-dimensional modeling techniques that were previously available to modelers only in a research environment. Applied Science Associates, Inc. has been very active in the development of such models in the PC environment. This effort includes application of hydrodynamics, pollutant transport and water quality models to s... View full abstract»

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  • The NaviComputer: a portable long baseline navigation system designed for interface to an autonomous underwater vehicle

    Publication Year: 2000, Page(s):2115 - 2121 vol.3
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    There are a number of systems that can be used to navigate an autonomous underwater vehicle (AUV). These include GPS, bottom locked Doppler systems, and a variety of compass technologies. However these all have their limitations, and their individual specifications may be degraded when incorporated into a full-up AUV navigation system. In contrast, long baseline navigation is accurate and repeatab... View full abstract»

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  • High resolution broadband beamforming based on the MVDR method

    Publication Year: 2000, Page(s):1673 - 1676 vol.3
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    In this paper, a simple, yet efficient and practical, high-resolution beamforming procedure is presented. Using FFT, broadband signals obtained from a linear sonar array are decomposed into multiple narrowband signals. For each narrowband signal, multiple MVDR (minimum variance distortionless response) beams are formed to cover the whole azimuth range using proper phase shifts on the steering vect... View full abstract»

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  • Synthetic long baseline navigation of underwater vehicles

    Publication Year: 2000, Page(s):2043 - 2050 vol.3
    Cited by:  Papers (49)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (908 KB)

    Describes a concept (patent pending) for accurate autonomous deep-water navigation of underwater vehicles (UVs) for extended periods of time. The concept is called synthetic long baseline (SLBL) and is based on the combination of dead-reckoning (DR) and acoustic range and/or range rate measurements from a single acoustic source, e.g., a transponder moored to the sea floor. Focus is kept on a simpl... View full abstract»

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  • Fish habitat characterization and assessment: approach to integrate seafloor features and juvenile organisms data

    Publication Year: 2000, Page(s):1555 - 1561 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    This study described seafloor features and juvenile fish community structure to provide a qualitative fish habitat assessment. Ocean-related uses and management strategies, ranging from coastal development and dredged material disposal to fishery activities and marine conservation measures, often influence marine and estuarine habitat and life. A major component of ocean resources management entai... View full abstract»

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  • Design and performance of the Hurricanes-at-Landfall equipment

    Publication Year: 2000, Page(s):1723 - 1725 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The National Data Buoy Center (NDBC) designed, fabricated, and installed meteorological “black boxes” (MBB) at nine Coastal-Marine Automated Network (C-MAN) stations around the southeast U.S. as part of the Hurricanes-at-Landfall (HAL) project. HAL was funded in cooperation with the Atlantic Oceanographic and Meteorological Laboratory/Hurricane Research Division (AOML/HRD) to develop t... View full abstract»

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  • Absorption estimation in marine sub-bottom layers

    Publication Year: 2000, Page(s):1907 - 1917 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    Continued advances in signal processing has allowed the generation of a process to extract individual layer absorption parameters (decibels/meter) from marine sub-bottom acoustic profiling data. The absorption data can be used to classify the sediment type for unconsolidated clean marine sediments based on a historical database generated from over 30 years of field data. Optimum results are obtain... View full abstract»

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  • Evaluation of the endfire response of a superdirective line array in simulated ambient noise environments

    Publication Year: 2000, Page(s):1489 - 1494 vol.3
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    Superdirective line arrays can provide high gains whenever the inter-element spacing is much less than half a wavelength. In practice these arrays often fall short for two reasons: First, performance degrades appreciably in the presence of uncorrelated system noise. Second, the optimum array weights are specific to the form of the noise field and the choice of these weights is sensitive to deviati... View full abstract»

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  • A cross-platform microstructure turbulence measurement package

    Publication Year: 2000, Page(s):2177 - 2183 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (908 KB)

    Ambient turbulence in the ocean is responsible for dissipating the kinetic energy in the ocean at very small scales. Small autonomous underwater vehicles (AUVs) provide versatile mobile platforms for surveying a shallow water coastal environment at low operational costs. The platforms are uncoupled from the low frequency vibrations associated with platforms towed from surface ships. Measurement of... View full abstract»

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