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By Topic

Date 10-12 Sept. 1984

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Displaying Results 1 - 25 of 212
  • [Front cover and table of contents]

    Publication Year: 1984, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (2339 KB)
    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1984, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (288 KB)
    Freely Available from IEEE
  • Applications Of Meteor-Burst Telemetry To Coastal Engineering Data Collection

    Publication Year: 1984, Page(s):1 - 7
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Meteor-burst telemetry uses low cost radio equipment to transmit information up to 2000 km via ionized meteor trails in the upper atmosphere. It has been applied in two large scale data collection networks in the United States and successfully tested in other areas of the world. Its present uses for coastal engineering data collection include transmission of wind and wave summary statistics from r... View full abstract»

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  • Strategic assessment of multiple resource-use conflicts in the US exclusive economic zone

    Publication Year: 1984, Page(s):1 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB)

    The 1983 Presidential proclamation establishing the US Exclusive Economic Zone (EEZ) has prompted new interest in the exploration and development of the resources of this vast oceanic area. Due to the incomplete nature of available information and the resultant uncertain decisionmaking context, decisions that maximize net national benefits from the EEZ will be difficult to identify and make. Since... View full abstract»

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  • Human Factors In Maker/User Evolvement Of A Unique Marine Gauging Technology

    Publication Year: 1984, Page(s):8 - 14
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    There is much written about the development of new instrument technology, about technical barriers confronted and overcome, and application engineering performed to meet real needs in the marketplace. But what about the subjective hurdles encountered? These human factors are more subtle, less amenable to taught engineering solution, yet can block the adoption of worthy, but unfamiliar, new develop... View full abstract»

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  • Doppler Techniques Applied to Fisheries Hydroacoustics

    Publication Year: 1984, Page(s):15 - 20
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (413 KB)

    Fisheries management agencies are in need of better technologies to monitor the runs of migratory species in free-flowing rivers. This paper describes a long-pulse 420 kHz riverine Doppler sonar designed to detect upstream migrating fish in shallow waters and to reject false targets and large reverberations from the surface and bottom. The use of Hanning-shaped long pulses (30 msec) results in goo... View full abstract»

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  • Complex Monopulse Processing, A Technoque For Hydrographic Mapping

    Publication Year: 1984, Page(s):21 - 23
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (202 KB)

    The complex monopulse technique is a processing approach which uses simultaneous in-phase and quadrature data from two beams to obtain amplitude and angle information from the backscattered acoustic signal. This approach is advantageous for hydrographic applications because the algorithm's simple implementation can allow rapid processing of the data. Another feature of this technique is that the i... View full abstract»

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  • Graphic Display Of Seabed Configuration By MultiBeam Sonar

    Publication Year: 1984, Page(s):24 - 29
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (467 KB)

    A high resolution multi-beam sonar using Complex Fast Fourier Transform (CFFT) algorithm has been developed. Since the sonar can measure a seabed configuration at real time and display it graphically in a three-dimensional way, it is applicable of detecting obstructions and surveying the seabed configuration. This paper describes the sonar system and its applications. View full abstract»

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  • Shrimp in the western Gulf of Mexico--A transboundary stock

    Publication Year: 1984, Page(s):29 - 32
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB)

    Through the mid-1970's, much of the Gulf of Mexico shrimp harvesting industry was established and capitalized on the ability to shrimp in domestic waters of the U.S. and the waters off the Mexican coast; operating about ten to eleven months of the year. In 1976, the Mexican government declared a 200 mile exclusive economic zone and negotiated a bilateral treaty with the U.S. to phase out all U.S. ... View full abstract»

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  • The Navy's LCTP and Future Applications Of Quiet, Air Driven Research Craft

    Publication Year: 1984, Page(s): 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (24 KB)

    To accelerate the rate of data acquisition and reduce the cost of towed sensor research and development, the Office of Naval Research undertook the development of a Low Cost Test Platform (LCTP). The craft that resulted from this program is an air propeller driven craft capable of towing array modules at speeds to 25 knots with substantially reduced waterborne radiated noise levels. This paper pro... View full abstract»

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  • A Generation of WOTAN Underwater Wind-Recording Instruments

    Publication Year: 1984, Page(s):31 - 36
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (499 KB)

    The acronym WOTAN means Weather Observations Through Ambient Noise. Determining surface wind velocity by the measurement of underwater acoustic noise spectral intensity in the 5 to 15kHz region is now a proven technique in both deep and shallow water. WOTAN sensors are versatile and have been used as an add-on for all types of underwater instruments (especially those already employing an acoustic ... View full abstract»

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  • U.S./Canada salmon interceptions

    Publication Year: 1984, Page(s):33 - 35
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB)

    First Page of the Article
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  • A Multi-Hydrophone Digital Acoustic Buoy System with In-Situ FFT Processing

    Publication Year: 1984, Page(s):37 - 44
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (762 KB)

    Two major problems have been historically associated with self-contained analog acoustic data acquisition buoy systems. First, analog tape recorder characteristics bound the obtainable dynamic range and time base stability of the recorded data. Second, post-processing of the data tapes to obtain the required acoustic information can be both time consuming and expensive. To address these problems, ... View full abstract»

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  • Transboundary stocks and maritime boundary delimitation in the Gulf of Maine area

    Publication Year: 1984, Page(s):38 - 42
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB)

    The Case Concerning the Delimitation of the Maritime Boundary in the Gulf of Maine area was recently argued by Canada and the United States before the International Court of Justice. This is the first case ever to involve the delimitation of an EEZ. This paper describes one novel argument in the case, the United States argument that the boundary should be drawn in a way that minimizes the number o... View full abstract»

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  • America's Exclusive Economic Zone: The whys and wherefores

    Publication Year: 1984, Page(s):43 - 46
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB)

    First Page of the Article
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  • Realtime Removal of Source Heave Effects from Marine Seismic Profiles

    Publication Year: 1984, Page(s):45 - 48
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The performance of a high resolution seismic profiling system is adversely affected by vertical, time-varying motion (heave) of the acoustic source/receiver. Removal of heave effects from seismic records can be accomplished in real time if the source/receiver heave is measured. This, in itself, represents a technically difficult problem due to the complex motion involved and the diverse sources of... View full abstract»

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  • Technology and oil and gas development in the exclusive economic zone

    Publication Year: 1984, Page(s):47 - 49
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB)

    The value of subsea oil and gas currently recovered from U.S. waters approaches $33 billion annually. In terms of value and strategic importance, petroleum resources will likely continue to dominate the economic activities in the U.S. Exclusive Economic Zone. However, the future prospects for offshore oil and gas development are changing. New emphasis is being placed on exploration in deepwater (&... View full abstract»

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  • Sonarlink - A Deep Ocean High Data Rate, Adaptive Telemetry System

    Publication Year: 1984, Page(s):49 - 53
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (327 KB)

    The design, implementation, testing, and uses of a high data rate, adaptive deep ocean acoustic telemetry and communications system are discussed. Digital and analog information may be transferred independently or simultaneously from depths in excess of 20,000 feet. Frequency Modulation (FM), Frequency Shift Keying (FSK), Differential Phase Shift Keying (DPSK), and Quadrature Amplitude Modulation ... View full abstract»

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  • The Self Calibrating Acoustic Transponder (SCAT) System

    Publication Year: 1984, Page(s):54 - 59
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    This paper describes a self-calibration technique for long baseline navigation that eliminates the requirement of the ship maneuvering throughout the transponder array. This new method requires only two special transponders which can be deployed in addition or in conjunction with a normal array of deep ocean transponders (DOT's). The self calibration technique requires only three acoustic data cyc... View full abstract»

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  • Transponder Net Self Calibration Algorithm

    Publication Year: 1984, Page(s):60 - 63
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    In operating an autonomous vehicle around a submerged structure it is often necessary to position the vehicle within 5 cm. Since the positioning accuracy of an acoustic navigation system relies on a precise knowledge of the transponder locations it is vital to calibrate the transponder net before sensitive tasks are undertaken. Complete calibration of some nets could require from hours to days res... View full abstract»

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  • Ferromanganese crust resources in the Pacific and Atlantic Oceans

    Publication Year: 1984, Page(s):62 - 71
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (391 KB)

    Ferromanganese crusts on raised areas of the ocean floor have joined abyssal manganese nodules and hydrothermal sulfides as potential marine resources. Significant volumes of cobalt-rich (about 1% Co) crusts have been identified to date within the U.S. Exclusive Economic Zone (EEZ) in the Central Pacific: NW Hawaiian Ridge and Seamount region, and seamounts in the Johnston Island and Palmyra Islan... View full abstract»

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  • Harmonic Mean Sound Speed is Adequate for Transponder Navigation

    Publication Year: 1984, Page(s):64 - 68
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    Underwater acoustic transponder navigation requires knowing the effective source to transponder sound speed in order to convert ping return times to slant ranges for use in position fix calculations. This computer study determined that simple harmonic mean sound speed calculations can be used to compute the effective sound speed with acceptable accuracy for many ocean engineering applications. Thu... View full abstract»

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  • Long Baseline Acoustic Navigation - A Flexible Approach to Custom Applications

    Publication Year: 1984, Page(s):69 - 74
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (363 KB)

    This paper describes a flexible approach to custom long baseline acoustic navigation applications. The basic concept is based on using standard acoustic hardware that measures acoustic travel times and communicates these travel times to a computer using software tailored to the application. The capability of an Acoustic Signal Processor to be controlled by a computer and to transmit travel times t... View full abstract»

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  • The Model 350 Sonar: A High Resolution, Electronically Scanned, Dual Frequency, Multiple Beam Obstacie Avoidance Sonar

    Publication Year: 1984, Page(s):75 - 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (442 KB)

    An electronically scanned pulse sonar with discrete, acoustically-formed beams provides the basis for a new line of sonar array instruments with evolutionary growth capabilities. A prototype, designated the Model 350, is being developed and tested as an obstacle avoidance sonar. The Model 350 is an attempt to optimize performance, size, and cost in terms of current technology, with future growth c... View full abstract»

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  • The Navcon Navigation and Survey Control Computer System

    Publication Year: 1984, Page(s):81 - 86
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (503 KB)

    Navcon was developed between 1978 and 1983 to provide survey control capabilities not available in commercial navigation computing systems. It consists of a 64K microprocessor board with dedicated subordinate modules for specific functions. The system is very flexible because the main administrative program is in Basic, but is very fast because all input-output and module control sub-routines are ... View full abstract»

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