By Topic

Date Aug. 29 1983-Sept. 1 1983

Filter Results

Displaying Results 1 - 25 of 253
  • Appendix

    Publication Year: 1983, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (2342 KB)
    Freely Available from IEEE
  • [Front cover and table of contents]

    Publication Year: 1983, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (870 KB)
    Freely Available from IEEE
  • Effective Use of the Sea Overcoming the Law of the Sea Problems

    Publication Year: 1983, Page(s):1 - 3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Satellite Remote Sensing and Ocean Physics

    Publication Year: 1983, Page(s):4 - 5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Stable Isotopes As Tracers In Ocean Sciences

    Publication Year: 1983, Page(s):6 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (117 KB)

    By making use of differences in stable carbon isotope ratios, which have resulted from chemical isotope effects, for carbon reservoirs large scale tracer experiments have been observed. These natural experiments have been used to quantify ocean pollution, sediment sources and duck food-webs. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Assessment Of Robotic Systems Technology For Research In The Ocean Sciences

    Publication Year: 1983, Page(s):8 - 10
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (297 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Sensitivity Of High Frequency Surface-Generated Noise To Sonar And Environmental Parameters

    Publication Year: 1983, Page(s):11 - 15
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (265 KB)

    This paper investigates the sensitivity of high frequency (6 to 60 kHz) surface-generated ambient noise to sonar and environmental parameters. A simulation model for the vertical directionality and depth dependence of noise originating at the ocean surface is developed. The use of the model is demonstrated when sonar beam elevation angle, receiver depth, water depth, and sound velocity profile are... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Use Of Acoustics In Localizing Under-Ice Oil Spills

    Publication Year: 1983, Page(s):16 - 20
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (426 KB)

    Because the oil-water interface is relatively smooth, acoustic backscatter from it should be small compared with that from the ice-water interface which is relatively rough because of the freezing process. The surface backscattering strength of ice was measured in the laboratory and in the field to determine the feasibility of using acoustics as a tool for detecting and localizing under-ice oil sp... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Sea-Truth Experiments On Acoustic Doppler Current Profiling Systems

    Publication Year: 1983, Page(s):21 - 26
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (421 KB)

    Two experiments were conducted in the summer of 1982 with "off-the-shelf" AMETEK-Straza DCP4400 acoustic Doppler current profiling systems. The first experiment compared a bottom-mounted upward-looking 300 kHz system against moored current measuring systems. Conductivity-temperature-depth (CTD) profiles, water samples, and meteorological data were collected to augment the current measurements and ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ocean Current Profiling With A Shipboard Doppler Acoustic Backscatter System

    Publication Year: 1983, Page(s):27 - 31
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (413 KB)

    An acoustic Doppler backscatter current profiler and associated data logging equipment were recently installed aboard the NOAA research vessel RESEARCHER. The system transmits 115 KHz acoustic pulses from a hull mounted three beam transducer and measures the doppler frequency shift of the backscattered signal as the pulses propagate down through the water column. The motion of the water is then co... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Real-Time Signal Processing Of Broadband Ocean Noise And Propagation Loss

    Publication Year: 1983, Page(s):32 - 36
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (294 KB)

    Modern Oceanographic bathymetry, hydrography and sub-bottom profiling systems typically require accurate ambient noise and propagation loss data in order to produce peak results. This paper describes a class of digital signal processing algorithms for analyzing these parameters, A class of FIR digital filters and an Incremental Fourier Transform implemented in a recursive algorithm are included. T... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Containment As A Measure Of Sonar System Performance

    Publication Year: 1983, Page(s):37 - 41
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (419 KB)

    Since World War II, the standard metrics for sonar system performance have been Figure-of-Merit and detection range if a specific environment was considered. Detection range can be computed many times for objects of varied depths to yield a similar metric - the depth coverage map. Although satisfactory for general comparisons of simple sonar systems, these metrics fail to account for essential fea... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Time Difference Raytrace Method For Ranging And Sound Channel Probing

    Publication Year: 1983, Page(s):42 - 44
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A method for time delay ranging in the deep sound channel is outlined here. The method is based on modeling sound channel SSP by an N-layer model. The parameters of the model are reference sound speed C_{o} . layer thickness \Delta Z and sound speed gradient vector \underline {g} .... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Accounting For Attenuation In Subsurface Layered Media Parameter Estimation: A Frequency Domain Approach

    Publication Year: 1983, Page(s):45 - 49
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (290 KB)

    Earlier work by the author in identifying subsurface layered media parameters involved the estimating of amplitude and delay parameters for acoustic wave propagation, using a time-domain formulation. In this paper the effects of frequency dependent attenuation are incorporated in a frequency-domain formulation. The problem considered is one of nonlinear parameter estimation and iterative algorithm... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Recursive Versus Batch Processing Algorithms For Bearings-Only Tracking

    Publication Year: 1983, Page(s):50 - 61
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    At long ranges, bearings-only tracking becomes increasingly difficult because the bearing rate approaches zero.Under such conditions,system observability is severely degraded and linearization errors take on added significance. To minimize their effects, iterative batch processing estimation algorithms have been proposed, even though they are computationally cumbersome. Recent studies have shown, ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Dispersion Removal From Marine Shallow Seismic Responses

    Publication Year: 1983, Page(s):62 - 66
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (270 KB)

    In certain seismic processing operations, such as acoustic impedence estimation, it is desireable to compensate for the dispersion. J.C. Robinson has presented a convenient algorithm for dispersion removal, however, the algorithm requires either a priori knowledge of the sediment quality factor (Q value) or the ability to select the proper compensation if a series of Q values is used. In this pape... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Synoptic Scale Wind Field Properties From The SEASAT SASS

    Publication Year: 1983, Page(s):67 - 74
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (638 KB)

    Dealiased SEASAT SASS vector winds obtained during the GOASEX program have been processed to obtain super-observations centered on a one degree by one degree grid. The results provide values for the combined effects of mesoscale variability and communication noise on the individual SASS winds. Each grid point of the synoptic field provides the mean synoptic east-west and north-south wind component... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • NonGaussian Water Waves And Spectra

    Publication Year: 1983, Page(s):75 - 78
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (294 KB)

    A partitioning of the deep water wave field into long and short waves is used to examine the asymptotic statistical properties of deep water gravity waves. In particular, the first calculation of a k_{-4} steady state spectrum for the long gravity waves based on a dynamic model is presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Hindcasting Waves From Winds On The East Coast Of Canada

    Publication Year: 1983, Page(s):79 - 84
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (387 KB)

    Since the discovery of hydrocarbon resources in apparently commercial quantities off the East Coast of Canada in the late nineteen seventies, the Marine Environmental Data Service (MEDS) has been involved in the development of design wave information for offshore structures. In the course of this work, MEDS has examined in detail all available sources of wave information for the Atlantic, includin... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Remote Sensing Of The Air-Sea Interface Using Microware Acoustics

    Publication Year: 1983, Page(s):85 - 92
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (659 KB)

    Measurements of sea surface acoustic backscatter and ambient noise at centimeter wavelengths have been taken over the past several years in the open ocean, Dabob Bay, and Lake Washington. These measurements were taken to characterize undersea reverberation and background noise as a function of geometry (e.g., grazing angle), frequency, and environmental conditions. The environmental conditions mea... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Introduction To The Session On Artificial Intelligence

    Publication Year: 1983, Page(s): 93
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (49 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Brief Introduction To Artificial Intelligence

    Publication Year: 1983, Page(s):94 - 99
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    Artificial Intelligence (A.I.) is a multidisciplinary field whose goal is to automate activities that presently require human intelligence. Recent successes in A.I. include computerized medical diagnosticians and systems that automatically customize hardware to particular user requirements. The major problem areas addressed in A.I. can be summarized as Perception, Manipulation, Reasoning, Communic... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Trends In Robotics And Implications For The Marine Environment

    Publication Year: 1983, Page(s):100 - 105
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (502 KB)

    The current state-of-the-art of robot technology has facilitated the introduction of robot automation, both primitive and intelligent, to marine sciences and engineering in ways which are qualitatively new. Most obvious are the opportunities for the application of robots to human tasks on the basis of (1) economic considerations, which for the marine environment are particularly sanguine because s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Intelligent Interface For Remote Supervision And Control Of Underwater Manipulation

    Publication Year: 1983, Page(s):106 - 110
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (571 KB)

    Underwater manipulation continues to pose challenges to both robotics and computer technologies. With recent advances in sensor and artificial intelligence technologies, "intelligent" robotics presents a novel and effective solution to coping with problems typically encountered in underwater manipulation tasks. To date, a number of manipulation systems with computer-based self-monitoring and plann... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Examination Of The Application Of Expert Systems In Unmanned Untethered submersibles

    Publication Year: 1983, Page(s):111 - 114
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (373 KB)

    An investigation is underway into the role of expert systems for the adaptive guidance and control of unmanned untetheted submersible vehicles. The emphasis is on understanding the potentials and problems of using expert systems that are time constrained. The expert system has evolved as a competent method of solving relatively complex problems. The bulk of successful approaches, however, seek to ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.