Results 251 to 260 of about 205,850 (297)
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IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004, 2004
Underwater gliders are buoyancy-driven devices; they alternately reduce and expand displaced volume to dive and climb through the ocean. Gliders carry wings and control their pitch attitude to effectuate a horizontal speed component through the ocean. They turn by rolling their wings or by use of a rudder.
Eric O. Rogers +4 more
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Underwater gliders are buoyancy-driven devices; they alternately reduce and expand displaced volume to dive and climb through the ocean. Gliders carry wings and control their pitch attitude to effectuate a horizontal speed component through the ocean. They turn by rolling their wings or by use of a rudder.
Eric O. Rogers +4 more
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Underwater acoustic beam dynamics
The Journal of the Acoustical Society of America, 2009Ray- and mode-based theoretical predictions of the spreads of directionally narrow beams are presented and compared to parabolic-equation-based simulations in deep-ocean environments. Both the spatial and temporal spreads of beams are considered. The environments considered consist of a range-independent deep-ocean background sound channel on which a ...
Francisco J, Beron-Vera +1 more
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Underwater Acoustic Channels Characterization for Underwater Cognitive Acoustic Networks
2018 International Conference on Intelligent Transportation, Big Data & Smart City (ICITBS), 2018This paper focuses on characterizing underwater acoustic (UWA) channels in the view of underwater cognitive acoustic networks. In the most recent years, underwater cognitive acoustic networks have attracted much attention in pace with that “digital ocean” is developing to “smart ocean”.
Anyi Wang, Baiping Li, Yuzhi Zhang
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On Multicasting in Underwater Acoustic Networks
2015 IEEE Global Communications Conference (GLOBECOM), 2014Even though underwater acoustic communication suffers from long propagation delays and has very limited bandwidth, it still plays a key role in supporting long-distance, low-power communication in underwater sensor networks. Many previous studies have tried to mitigate the impact of long propagation delays, but recently, the focus has shifted from ...
Linbo Zhang, Mehul Motani
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Acoustic-inertial underwater navigation
2017 IEEE International Conference on Robotics and Automation (ICRA), 2017In this paper, we introduce a novel acoustic-inertial navigation system (AINS) for Autonomous Underwater Vehicles (AUVs). We are aiming to reduce the cost and latency of current underwater navigation systems that typically employ high-accuracy and thus high-cost inertial sensors.
Yulin Yang, Guoquan Huang 0001
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Underwater acoustics and acoustical oceanography
The Journal of the Acoustical Society of America, 2011Though underwater acoustics (UW) and acoustical oceanography (AO) have different goals, their overlap often makes efforts in these areas indistinguishable. In this talk I emphasize their similarities while also discussing their different approaches.
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Cooperative underwater acoustic communications.
IEEE Commun. Mag., 2013This article presents a contemporary overview of underwater acoustic communication (UWAC) and investigates physical layer aspects on cooperative transmission techniques for future UWAC systems. Taking advantage of the broadcast nature of wireless transmission, cooperative communication realizes spatial diversity advantages in a distributed manner.
Suhail Al-Dharrab +2 more
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Directional acoustic underwater thruster
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2011This study describes a tested prototype for a controllable directional underwater thruster with no moving parts. During operation, a high-intensity acoustic wave creates directional water jets and the device moves itself in the opposite direction. When the underwater thruster moves along a non-vertical angle, it can produce straight backward thrust of ...
Wang, Ziyu +7 more
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OFDMA for underwater acoustic communications
2011 49th Annual Allerton Conference on Communication, Control, and Computing (Allerton), 2011We investigate the possibility of using orthogonal frequency division multiple access (OFDMA) for design of efficient underwater acoustic (UWA) networks. The major challenge for the OFDMA-based UWA communication systems is the Doppler-induced frequency scaling, which may cause severe intercarrier interference (ICI), and depending on the particular user
Kai Tu +3 more
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Underwater acoustic communications
IEEE Communications Magazine, 1982Azizul H. Quazi, William L. Konrad
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