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OCEANS '95. MTS/IEEE. Challenges of Our Changing Global Environment. Conference Proceedings.

Date 9-12 Oct. 1995

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  • OCEANS '95 MTS/IEEE "Challenges of Our Changing Global Environment" Vol. 3

    Publication Year: 1995
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    Freely Available from IEEE
  • Authors index

    Publication Year: 1995
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    Freely Available from IEEE
  • Measurement of suspended sediment in the surf-zone

    Publication Year: 1995, Page(s):1800 - 1804 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A six-frequency acoustic backscatter device has been developed that permits the measurement of suspended sediment in the presence of air bubbles. The hardware and the inversion algorithm are described. Measurements of known sediment concentration and grain size in laboratory as well as measurements in the surf zone are presented View full abstract»

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  • Shipboard data acquisition, processing and analysis: an integrated software approach

    Publication Year: 1995, Page(s):1794 - 1799 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    Recent advancements in microprocessor technology have spawned an improved class of instruments for ocean surveys and research. These instruments provide a high rate of data acquisition that generates large volumes of digital data. The design of an operational sampling system must coordinate the flow, processing, and archiving of data from multiple data sources and disparate data formats. In this p... View full abstract»

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  • Reducing the computational requirements of adaptive equalization in underwater acoustic communications

    Publication Year: 1995, Page(s):1405 - 1410 vol.3
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    A key component in coherent underwater acoustic communication systems is an adaptive equalizer capable of tracking changes in the acoustic environment. The computation requirements of this equalizer can be very high, requiring substantial computation hardware and high power consumption. Several techniques have been devised for reducing the computational load of the equalizer by exploiting structur... View full abstract»

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  • Matched field tracking at laboratory scale

    Publication Year: 1995, Page(s):2057 - 2060 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Laboratory scale measurements have been conducted to investigate the concept of matched field tracking in shallow water. Matched field source tracking correlates experimental measurements to theoretical solutions of the acoustic field for possible source tracks. High correlation between the measurements and the theoretical solutions identify the trajectory of the source. Due to the complexity of s... View full abstract»

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  • An in situ optics system for coastal ocean color monitoring

    Publication Year: 1995, Page(s):1787 - 1793 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    A recent transition of several Naval operations to coastal environments has emphasized the need for regional- to basin-scale maps of water clarity. Data integrated from in situ and remotely sensing instruments are required to provide these maps. A specially designed vertical profiling system is the primary source of in-water optics data for the Naval Oceanographic Office. Optical measurements incl... View full abstract»

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  • Capacity calculations for rapidly fading communications channels

    Publication Year: 1995, Page(s):1397 - 1404 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    This paper derives the Shannon channel capacity-cost function for a class of randomly time-varying channels under an average power constraint. The channels considered can be characterized by a series of uncorrelated parallel diversity channels with Gaussian-distributed random gain and additive white Gaussian noise parameters. The resulting expression for the single-channel case clearly shows that ... View full abstract»

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  • A fluid-filled flextensional device for ocean acoustic tomography

    Publication Year: 1995, Page(s):2021 - 2026 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Ocean acoustic tomography (OAT) is primarily concerned with the mapping of an ocean interior by the use of acoustic transponders dotted around the periphery of an ocean basin. By measuring the mean time-of-flight of the acoustic emanations between source and receiver pairs and using suitable inversion algorithms, it is possible to obtain a synoptic view of temperature and current flow over areas e... View full abstract»

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  • Polarization degradation in the sea surface environment

    Publication Year: 1995, Page(s):1517 - 1522 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The problem of electromagnetic scattering from a randomly rough surface is analyzed using the Kirchhoff approximation (stationary phase, scalar approximation), the small perturbation model and the two-scales models. A first major new consideration in this paper is study of the domain of validity of the Kirchhoff and small-perturbation rough surface scattering models (in the bistatic case). Compari... View full abstract»

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  • High resolution adaptive beamforming for a three dimensional sonar imaging system

    Publication Year: 1995, Page(s):2051 - 2056 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Investigates the use of adaptive beamforming techniques to increase the resolution of a sonar imaging system. The sonar hardware (FTV) developed by a group at the Scripps Institution of Oceanography uses eight transmit beams and eight receive beams, each of which is oriented in a slightly different direction, to image a volume using an 8×8 grid of beams in elevation and azimuth. Imaging curr... View full abstract»

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  • Tide gauge and current meter array of the Royal Australian Navy

    Publication Year: 1995, Page(s):1775 - 1786 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1004 KB)

    Hydrographic Service of the Royal Australian Navy (RAN) is responsible for charting of the area extending from the middle of Indian Ocean to the equatorial waters of Papua New Guinea to the Antarctic, with tidal regime varying from fully diurnal to fully semi-diurnal and the range from 2 to over 40 feet. Accurate tidal information is vital in surveying and charting, and to provide it, three years ... View full abstract»

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  • Contaminant transport measurements in San Diego Bay

    Publication Year: 1995, Page(s):1691 - 1699 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    A method is described by which the tidal transport of petroleum hydrocarbons is measured directly at several sections within San Diego Bay. The resulting data set is unique in that it provides a quantitative means for estimating contaminant transport and tidal flushing. The measurements were obtained with a combination of shipboard instrumentation including an acoustic Doppler current profiler (AD... View full abstract»

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  • Reduced complexity adaptive array processing for multi-user communications

    Publication Year: 1995, Page(s):1392 - 1396 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The problem of multi-user communications through channels such as the shallow water acoustic channel presents a challenge in managing receiver complexity. On one hand, the multi-access interference and extended time-varying multipath which are often encountered seemingly push for using arrays of hydrophones, complex algorithms, and a corresponding increase in computing power to successfully separa... View full abstract»

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  • A wide swath parametric 3.5 kHz sub-bottom profiling system

    Publication Year: 1995, Page(s):2016 - 2020 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Although various types of sub-bottom profiling systems, both direct frequency and parametric, are commercially available, none have wide swath capability. The system described in this paper is based on an adaptation of an existing US Navy 12 kHz multi-beam bathymetric sonar system, SASS, but may also be combined with other existing commercially available multi-beam array sonars. Parametric theory ... View full abstract»

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  • First dives of the “MIR” submersibles on new hydrothermal field in the Atlantic

    Publication Year: 1995, Page(s):1511 - 1515 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Brief analysis of the deep ocean research of a new hydrothermal field at 14°45'N on the Mid Atlantic ridge are presented. The first investigations of this new field were done with the “MIR-1” and “MIR-2” manned submersibles on 3000 m depth. During two dives of the “MIR”s geological structure of the field, as well as many species of the animals were observed.... View full abstract»

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  • Fusion of multiprobe NDT data for ROV inspection

    Publication Year: 1995, Page(s):2046 - 2050 vol.3
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Scientific measurements based on a single sensor provide only limited information about the environment in which it operates. Therefore, the synergistic use of measurement data from a probe array composed of multiple sensors will significantly increase the analytical power of a scientific instrument. At present underwater inspection surveys performed using remotely operated vehicles (ROVs) represe... View full abstract»

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  • An inexpensive wave height sensor for drogued Argos drifters

    Publication Year: 1995, Page(s):1769 - 1774 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    This wave height sensor measures significant wave height and wave height spectral energy in a drogued drifter consisting of a surface float attached to a large drogue by an elastic suspension system. The accelerations of the float are analyzed using embedded FFT subroutines in the buoy electronics, the data are formatted into a short binary message and telemetered to a satellite. This paper descri... View full abstract»

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  • Adaptive force control for the ARM manipulator

    Publication Year: 1995, Page(s):2092 - 2096 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The development and modelling of a compliant device to enable compliant force control is described. The early stages of the development of the control formalism is also described, A PUMA 560 six degree-of-freedom manipulator, holding a crack detection probe, is required to make contact with a surface in space and then track along it using force feedback information. A novel design of compliant dev... View full abstract»

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  • A generalized environmental database for San Diego Bay

    Publication Year: 1995, Page(s):1686 - 1690 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    Understanding the fate and effect of materials introduced into marine ecosystems requires broad spatial and temporal perspectives. It may also require the aggregation of measurement data from different scientific disciplines. Because the collection of data on these scales is beyond the scope of most monitoring studies, it is often necessary to share measurements made by different investigators for... View full abstract»

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  • Code shift keyed spread spectrum for ocean acoustic telemetry

    Publication Year: 1995, Page(s):1386 - 1391 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    Code shift keyed spread spectrum (CSK-SS) transmits information by sending symbols consisting of various phases of a finite length spread spectrum code. In its rudimentary form, a symbol interval of length T is partioned into N chips, modulated with cyclic shift of an underlying length N code sequence. The information is demodulated using an FFT matched filter, which realizes periodic correlation.... View full abstract»

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  • The navigation system for an expendable fiber cable ROV “UROV”

    Publication Year: 1995, Page(s):1985 - 1990 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The Japan Marine Science and Technology Center (JAMSTEC) have developed a free-swimming expendable fiber cable ROV “UROV” for under sea investigation that was built in co-operation between Fukui Prefectural Fisheries Experimental Station and JAMSTEC in 1992. Sea trials proved that it is able to swim over 1000 meters near the seafloor during two hours operation within the battery limits... View full abstract»

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  • Complex of technical equipment for cleaning and check of status of underwater parts of ship out of dock

    Publication Year: 1995, Page(s):2013 - 2015 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The cleaning of underwater parts of vessels is a very expensive problem. The aim of the work described is to design complex equipment (BOS-1) for without dock cleaning and inspection of underwater parts of vehicles without the aid of divers View full abstract»

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  • Seasonal sediment load, light attenuation and eel grass coverage in San Diego Bay

    Publication Year: 1995, Page(s):1745 - 1750 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    Eel grass (Zostera marina) beds in San Diego Bay are a protected habitat and artificial planting of beds is often accepted as mitigation for environmental disruption. The beds reduce sediment erosion, serve as a nursery for young fish and benthic organisms, and hence attract larger foragers. Which environmental parameters control the growth and distribution of eel grass, and under what conditions,... View full abstract»

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  • Space technology underwater undersea technology at the Jet Propulsion Laboratory

    Publication Year: 1995, Page(s):1505 - 1510 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    The Jet Propulsion Laboratory (JPL) of the California Institute of Technology is a Federally Funded Research and Development Center (FFRDC) whose primary mission is the unmanned exploration of the Universe, under contract to the National Aeronautics and Space Administration (NASA). This article describes the range of underwater technologies and geophysical measurement systems that this organisatio... View full abstract»

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