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Oceanic Engineering, IEEE Journal of

Issue 3 • Date July 1980

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Displaying Results 1 - 6 of 6
  • [Front cover and table of contents]

    Page(s): 0
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    Freely Available from IEEE
  • Comparison of the radiometric signatures of ore boats and their wakes at 35 GHz with model calculations

    Page(s): 187 - 195
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    Vertically polarized antenna temperatures of ore boats and their wakes were measured with a 35-GHz radiometer from a helicopter platform. The signatures of the boats appear to be independent of viewing angle at a temperature which is about 40 K cooler than the surrounding water. The signatures of the wakes show a dependence on viewing angle. Models for the antenna temperature are presented which fit the measured data to within the accuracy of the measurement and model parameters. These models are useful in themselves for predicting the antenna temperatures of targets in terms of parameters such as viewing angle, beam fill factor (BFF), antenna main beam efficiency, and target emissivity. View full abstract»

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  • Spatial and temporal correlation of underwater sunlight fluctuations in the sea

    Page(s): 195 - 198
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    A submerged linear array of photodetectors was used to measure sunlight irradiance fluctuations caused by ocean surface waves. Decorrelation times and lengths were found to be functions of depth. It was also found that the sensor depth selects a dominant temporal frequency from the random surface waves. View full abstract»

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  • [Back cover]

    Page(s): c4
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    Freely Available from IEEE
  • Portable acoustic tracking system for divers (PATS)

    Page(s): 204 - 209
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    A portable acoustic tracking system (PATS) has been developed for the Navy to track underwater construction teams in water depths to 200 ft. The tracking system can be deployed and operated by the divers and is intended for use in remote areas and for nearshore survey, maintenance, and construction work. A self-calibrating system provides a geographically justified track for up to eight divers. Diver position coordinates are computed from acoustic measurements at periodic intervals and displayed for control purposes. The positions are also recorded for future reference. View full abstract»

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  • Multiple terminal acoustic communications system design

    Page(s): 199 - 204
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    A design is presented for a system providing highly reliable command and control acoustic communications between a mother ship and a number of small fast submersibles. The small submersibles may be employed for underwater mining, exploration, bottom mapping, or military surveillance. Modulation and coding design is presented; the techniques discussed provide multiple protection against multipath and fading, high reliability, acceptable transmitted signal total time duration, simplicity, and economy. The required decision point signal-to-noise ratio (SNR) for Rayleigh fading conditions is derived for the modulation and coding design. Particular attention is paid in the receive signal processing to the Doppler (relative velocity) and Doppler variation (relative acceleration) problems inherent in a scenario with mobile endpoints. A Figure-of-Merit (FOM) calculation is provided for typical geometrical and environmental parameters. It is shown for a realistic source level that the required SNR can be achieved at long range with considerable endpoint relative motion. View full abstract»

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Aims & Scope

The IEEE Journal of Oceanic Engineering (ISSN 0364-9059) is published quarterly by the IEEE Oceanic Engineering Society (IEEE OES). The scope of the Journal is the field of interest of the IEEE OES, which encompasses all aspects of science, engineering, and technology that address research, development, and operations pertaining to all bodies of water. This includes the creation of new capabilities and technologies from concept design through prototypes, testing, and operational systems to sense, explore, understand, develop, use, and responsibly manage natural resources.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
N. Ross Chapman
School of Earth & Ocean Sciences
University of Victoria
3800 Finnerty Road
Victoria, BC V8P 5C2 Canada
chapman@uvic.ca