Results 181 to 190 of about 23,975 (237)
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Acoustic telemetry system for underwater control
IEEE Journal of Oceanic Engineering, 1991Underwater acoustic communication in multipath environment encountered in shallow water is restricted mostly by signal fading. It degrades both signal detection and time synchronization required for reliable acoustic communication. A new approach to time synchronization and frequency diversity method is emphasized.
Vukadin, Predrag, Hudec, Goran
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Spread spectrum underwater acoustic telemetry
IEEE Oceanic Engineering Society. OCEANS'98. Conference Proceedings (Cat. No.98CH36259), 2002Spread spectrum methods are used in communication systems to provide low probability of intercept in hostile environments, to provide multiple access capability in systems shared by many users, and to provide processing gain in channels where the transmitted signal is distorted by multipath propagation.
M. Stojanovic +3 more
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Acoustic telemetry and fisheries management
Ecological Applications, 2017AbstractThis paper reviews the use of acoustic telemetry as a tool for addressing issues in fisheries management, and serves as the lead to the special Feature Issue of Ecological Applications titledAcoustic Telemetry and Fisheries Management. Specifically, we provide an overview of the ways in which acoustic telemetry can be used to inform issues ...
Glenn T. Crossin +7 more
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Offshore Technology Conference, 1970
ABSTRACT In this paper basic considerations in the design of a practical acoustic telemetry system are developed. These considerations are then applied to three representative modulation schemes: pulse position modulation [PPM], frequency modulation [FM] and frequency shift keying [FSK].
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ABSTRACT In this paper basic considerations in the design of a practical acoustic telemetry system are developed. These considerations are then applied to three representative modulation schemes: pulse position modulation [PPM], frequency modulation [FM] and frequency shift keying [FSK].
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Acoustic telemetry for oilfield operations
IEEE Instrumentation & Measurement Magazine, 2013The continuing need for a reliable data path up to 10 km long with reasonable data rate is a critical issue for any number of petroleum industry applications. This article gives a brief introduction to well completions; casing and tubing use in finished wells; and considerations affecting a commercial system addressing the data rate problem in a ...
Don Kyle, Michael Fripp, Kevin Fink
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Acoustic telemetry for ocean acoustic tomography
IEEE Journal of Oceanic Engineering, 1984Very low data rate burst telemetry for long-range deep-ocean applications is discussed. Energy efficiency, propagation coherence, and waveform coding, together with transmitter constraints, influenced the design of proposed buoy-to-buoy and buoy-to-shore systems.
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The Multichannel Acoustic Telemetry System
OCEANS 81, 1981An acoustic system to measure a descent velocity of a self-contained instrument package is described in this paper. The system is also capable of transmitting two additional time variables. The velocity measurement is based on the Doppler frequency shift of an acoustic signal, while the two other channels use frequency modulated carriers.
A. Zielinski, W. Jacobs, D. Howse
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Remote sensing and acoustic telemetry
MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295), 2002There is a growing need for remote underwater sensing and imaging without the burden of cabled connectivity to the outside world, and the best method for achieving this is with acoustic communications. However, the acoustic link is only one aspect of the problem, as the sensor system needs to interface with the modem, and perhaps with intermediary ...
D. Green, T. Nguyen
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Acoustic Telemetry Of Video Information
Proceedings OCEANS '83, 1983Increasing use of underwater instrumentation packages and remotely operated submersibles is giving rise more frequently to applications where availability of an acoustic link for telemetry of video information would be useful. Such links are very sensitive to multipath interference which is an often present property of underwater sound propagation ...
J. Collins, J. Galloway
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IEEE Transactions on Communications, 1966
An underwater telemeter system has been developed for the White Fish Authority which can provide the fishing trawler skipper with information concerning various features of the trawl he is towing, e.g., mouth opening, ambient conditions, etc. The system employs time-division multiplexing to provide four channels with the information being transmitted ...
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An underwater telemeter system has been developed for the White Fish Authority which can provide the fishing trawler skipper with information concerning various features of the trawl he is towing, e.g., mouth opening, ambient conditions, etc. The system employs time-division multiplexing to provide four channels with the information being transmitted ...
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