IEEE Journal of Oceanic Engineering
Papers 2748
1 page of 275 pages (2,748 results)
#1J. Daniel Park (PSU: Pennsylvania State University)H-Index: 3
#2John F. Doherty (PSU: Pennsylvania State University)H-Index: 11
Steganographic transmission waveforms are desirable for many applications, such as underwater acoustic communications, surveillance, detection, and tracking. In the context of active sonar tracking, an overall approach is presented that covers several topics including background sound modeling, steganographic security assessment of transmission waveforms, target motion modeling, and batch track detection. In shallow water, environment background sound dominated by snapping shrimp, the presented ...
#1Amir Tadayon (NU: Northeastern University)H-Index: 2
#2Milica Stojanovic (NU: Northeastern University)H-Index: 54
This article addresses the problem of coherent detection of acoustic orthogonal frequency division multiplexing (OFDM) signals using a sparse channel estimation method based on a physical model of multipath propagation. Unlike the conventional sample-spaced and subsample-spaced methods, such as least squares and orthogonal matching pursuit (OMP), which target the taps of an equivalent discrete-delay channel response, the path identification (PI) method targets the physical propagation paths in a...
#1Jacob Rudander (Kongsberg Maritime)H-Index: 1
#2Paul van Walree (Norwegian Defence Research Establishment)H-Index: 11
Last.Pål Orten (Kongsberg Maritime)H-Index: 15
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Very-high-frequency (VHF) underwater acoustic communication is a relatively unexplored terrain, but its importance is expected to increase with the growing demands for larger bandwidths and higher data rates. Knowledge of VHF propagation channels is a prerequisite to achieve high data throughput. In this paper, we present time-variant angle-resolved impulse responses for a set of 250-kHz shallow-water channels. The measurements were performed at high resolution using 64 hydrophones arranged in a...
#1Hüseyin Özkan Sertlek (LEI: Leiden University)H-Index: 4
#2Michael A. Ainslie (JASCO Applied Sciences)H-Index: 5
Last.Kevin D. HeaneyH-Index: 1
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An analytical formulation for the calculation of the range and depth-dependence of propagation loss in isospeed water is introduced. The range-dependent bathymetry is handled with Weston's ray invariant approach, requiring a gradually varying water depth. The depth dependence of propagation loss is formulated using a transformation from an incoherent mode sum to an integral over angle, in the adiabatic approximation, and the results obtained in this way are tested by comparison with a full adiab...
1 CitationsSource
#1Avi Abu (University of Haifa)H-Index: 1
#2Roee Diamant (University of Haifa)H-Index: 11
In this paper, we focus on the segmentation of sonar images to achieve underwater object detection and classification. Our goal is to achieve accurate segmentation of the object's highlight and shadow regions. We target a robust solution that can manage different seabed backgrounds. Segmentation of sonar images is a challenging task. Speckle noise and intensity inhomogeneity may cause false detections and complex seabed textures, such as sand ripples and seagrass, often leading to false segmenta...
1 CitationsSource
#1Zheng Cao (UF: University of Florida)H-Index: 5
#2Shujian Yu (UF: University of Florida)H-Index: 8
Last.Jose C. Principe (UF: University of Florida)H-Index: 65
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To analyze marine animals’ behavior, seasonal distribution, and abundance, digital imagery can be acquired by a camera or a Lidar. Depending on the quantity and properties of acquired imagery, the animals are characterized as either features (shape, color, texture, etc.) or dissimilarity matrices derived from different shape analysis methods (shape context, internal distance shape context, etc.). For both cases, multiview learning is critical in integrating more than one set of feature/dissimila...
#1Yichen Li (SJTU: Shanghai Jiao Tong University)H-Index: 1
#2Yiyin Wang (SJTU: Shanghai Jiao Tong University)H-Index: 10
Last.Xinping Guan (SJTU: Shanghai Jiao Tong University)H-Index: 43
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The localization of autonomous underwater vehicles (AUVs) in anchor-free environments has always been a difficult problem due to the lack of global positioning systems and absolute references. In general, AUVs localize themselves by dead reckoning (DR), whereas the localization error grows without bound. To alleviate the growth of the localization errors, we propose intermittent belief propagation based dead reckoning (IBPDR) as a cooperative localization (CL) framework. In IBPDR, AUVs use DR to...
#1Yuriy Zakharov (Ebor: University of York)H-Index: 18
#2Benjamin Henson (Ebor: University of York)H-Index: 2
Last.Tim C. Tozer (Ebor: University of York)H-Index: 17
view all 8 authors...
In underwater acoustic (UWA) communications, the propagated signal undergoes severe Doppler and multipath distortions. The Doppler estimation/compensation and channel estimation/equalization techniques are required to deal with these distortions and contribute significantly to the overall complexity of UWA modems. In this article, we propose a data packet structure for high data rate transmission in time-varying UWA channels with the channel dynamic modeled by velocity and acceleration between t...
1 CitationsSource
#1Adam Brown (UW: University of Washington)H-Index: 2
#2Jim Thomson (UW: University of Washington)H-Index: 90
Last.Merrick C. Haller (OSU: Oregon State University)H-Index: 16
view all 6 authors...
Surface wave instrumentation floats with tracking were deployed by helicopter ahead of five large storms off the Oregon coast. The buoys drifted freely with the wave motions, surface currents, and wind. The buoys use a 9-DoF inertial measurement unit that fuses the measurements of accelerometers, magnetometers, and gyroscopes to measure acceleration in the global North-West-Up reference frame. Rapid sampling (25 Hz) allows for the observation of both propagating wave motions and wave breaking ev...
1 CitationsSource
Top fields of study
Electronic engineering
Underwater acoustics