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
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    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 algorithms for open ocean marine mammal monitoring

    Publication Year: 2000, Page(s):1749 - 1752 vol.3
    Cited by:  Papers (10)
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    The Naval Undersea Warfare Center has been funded by the Office of Naval Research Environmental Requirements Advanced Technology (ERAT) program to create a multi-disciplinary program to conduct Marine Mammal Monitoring on Navy Undersea Ranges (M3R). The objective is to supplement extensive undersea range and signal processing hardware with state of the art passive marine mammal detectio... View full abstract»

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  • A possible relationship between waveguide properties and bandwidth utilization in humpback whales

    Publication Year: 2000, Page(s):1743 - 1747 vol.3
    Cited by:  Papers (1)
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    Humpback whales may use different sounds based on the propagation characteristics of the environment within which they are vocalizing. The authors used computational techniques to assess how well different frequencies propagate in environments frequented by humpback whales. The results of these simulations suggest that humpbacks should use different frequencies in northern feeding grounds from tho... View full abstract»

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  • A blind receiver for digital communications in shallow water

    Publication Year: 2000, Page(s):1839 - 1846 vol.3
    Cited by:  Papers (6)
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    In spring 1999, a sea trial in the coastal region of the Dutch North Sea has been conducted in the scope of the EU-MAST III project ROBLINKS to obtain underwater acoustic data for digital communication in shallow water environments. In this paper, we propose a blind receiver architecture and present results of its application to some specific communication signals transmitted during the experiment... View full abstract»

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  • A scenario for Right Whale detection in the Bay of Fundy

    Publication Year: 2000, Page(s):1735 - 1741 vol.3
    Cited by:  Papers (4)
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    The Northern Right Whale (Eubalaena glacialis) is the most endangered large whale species. Collisions with ships is the cause of a large percentage of documented deaths, and is an inherent problem in the Bay of Fundy in summer and fall, when the whales are in the area. Acoustic methods to detect, localize and track right whales are investigated for the Bay of Fundy. Factors limiting probability of... View full abstract»

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  • Implementation of a sweep-spread function for communication over underwater acoustic channels

    Publication Year: 2000, Page(s):1829 - 1837 vol.3
    Cited by:  Papers (2)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (900 KB)

    Communication over underwater acoustic channels with strong, extended multipath can be substantially improved by using a new method based on the implementation of a sweep-spread carrier (S2C). Such a carrier consists of a succession of sweeps, which cause permanent rapid fluctuation of signal frequency. Apart from some additional useful effects such as providing multi-user access and reducing infl... View full abstract»

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  • Acoustic-based position discrimination of a moving robot

    Publication Year: 2000, Page(s):2147 - 2154 vol.3
    Cited by:  Papers (1)
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    A real-world experiment is described, demonstrating the possibility of discriminating positions of a mobile robot moving through an unknown, unprepared office room, solely based on broadband audible acoustic signals. The average distance of distinguishable positions was found to be less than 15 cm. Maximum length sequence measurements are used to obtain the impulse response of the room at the pres... 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)
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    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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  • Spatio-temporal processing of coherent acoustic communications data in shallow water

    Publication Year: 2000, Page(s):1625 - 1631 vol.3
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    Achieving reliable underwater communications in shallow water is a difficult task due to the random time varying nature of multipath propagation. This paper describes a novel coherent space-time processing method for acoustic communications in a marginally overspread channel operating between 16 kHz and 32 kHz. The FAU-MillsCross, a 64-channel high performance acoustic receiver, is our real-time d... View full abstract»

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  • Robust shallow water acoustic communications based upon orthogonal sequences and real-time channel identification

    Publication Year: 2000, Page(s):1825 - 1828 vol.3
    Cited by:  Papers (9)
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    Shallow water acoustic communication (water depth <100 m; range/depth ratio~100) is addressed. Under these conditions the main difficulties are related to the time/Doppler spread and the time variability of the channel. A new signalling scheme, especially designed for robustness in these conditions, is addressed. It is based upon transmission of “quasi orthogonal” sequences. A fixed... View full abstract»

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  • AUV biomimetic propulsion

    Publication Year: 2000, Page(s):2141 - 2146 vol.3
    Cited by:  Papers (13)
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    The main goals of this research were to 1) refine manufacturing processes in order to develop novel soft, highly compliant and efficient electroactive materials for 2) subsequent characterization and integration into a prototype autonomous aquatic vehicle as a visible demonstration platform. Therefore several manufacturing processes to develop active polymeric composites were investigated and refi... 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
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    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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  • Shallow-water acoustic communication with high bit rate BPSK signals

    Publication Year: 2000, Page(s):1621 - 1624 vol.3
    Cited by:  Papers (5)
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    BPSK signals have been defined for transmission through a shallow-water acoustic communication channel. The signals were accompanied by two displaced carriers to facilitate carrier recovery. To correct for the adverse effects of time spreading, a pseudo-random learning sequence was transmitted ahead of the communication signal. The signal processing consists of a shift to baseband guided by the di... 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 (3)  |  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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  • Bathymetric and side-scan data fusion for sea-bottom 3D mosaicing

    Publication Year: 2000, Page(s):1663 - 1668 vol.3
    Cited by:  Papers (8)  |  Patents (1)
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    The goal of sea-bottom mosaicing is to georeference each sample of a side-scan image in an accurate manner as this image consists only in a time-sampled backscattering recording. Thus, a flat sea-bottom assumption is generally used to spatially relocate each sample according to the height of the sensor. In the case of altitude varying sea-bottom (slopes, ridges, etc.), this hypothesis clearly intr... View full abstract»

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  • Application of single-beam acoustics to macro-algae bloom management

    Publication Year: 2000, Page(s):1703 - 1705 vol.3
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    Delaware's inland bays are shallow enclosed estuaries located behind barrier beaches with limited tidal flushing. These bays (Rehoboth, Indian River and Little Assawoman) are experiencing increased recreational usage. Nutrient loading of the bays is increasing. This increased nutrient load has caused extensive blooms of macro algae of the Ulva genus. This alga is uprooted from the bottom by storms... View full abstract»

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  • Analysis of non-stationary vector fields using wavelet transforms

    Publication Year: 2000, Page(s):1521 - 1527 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (764 KB)

    Fast Fourier transforms (FFT) and empirical orthogonal functions (EOF) have been widely applied to coastal zone current measurements. However riverine tides, estuarine outflows, and eddies, exhibit non-stationary characteristics which invalidate the basic assumptions of these methods. Wavelet analysis techniques can be used to determine the temporal evolution of ocean current variance over a range... View full abstract»

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  • Control system applications in wave energy conversion

    Publication Year: 2000, Page(s):1817 - 1824 vol.3
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (616 KB)

    Significant improvements in the cost-effectiveness of wave energy devices may be possible with successful implementation of active control of device dynamics. The purpose of this paper is to present an overview of a number of recent applications of active control in wave energy conversion. Simpler frequency domain control applications including reactive control and latching are examined first. Nex... 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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  • Hydrodynamics of an autonomous underwater vehicle equipped with a vectored thruster

    Publication Year: 2000, Page(s):2135 - 2140 vol.3
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (644 KB)

    A numerical method for solving the steady flow around an AUV equipped with a vectored thruster is developed. Specifically, the axisymmetrical differential equation for the stream function is solved using a finite-difference technique. The results are used to compute the velocity and pressure field. The boundary layer characteristics are then estimated, and used to determine the location of separat... View full abstract»

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  • An expandable deep seafloor monitoring system for earthquake and tsunami observation network

    Publication Year: 2000, Page(s):1719 - 1722 vol.3
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (552 KB)

    The Japan Marine Science and Technology Center is developing and installing the submarine cable systems for building a series of in-line geo-scientific observation network at typical seismogenic zones around Japan since 1995. The second observation system was deployed in July 1999 on the southern Kuril subducting zone in southeastern part of Hokkaido (Off Kushiro-Tokachi area). The system consists... View full abstract»

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  • Concept of Eco-Platform

    Publication Year: 2000, Page(s):1943 - 1949 vol.3
    Cited by:  Papers (1)
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    The authors propose the concept of an “Eco-Platform”, setting their sight on solving problems that have arisen/arise/will arise around the coastal areas and on the restoration of natural environments of the world as a final goal. The Eco-Platform is a floating platform on which facilities are installed to dispose waste and sewage from land area, to generate heat/electric energy, to rep... View full abstract»

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