Results 1 to 10 of about 893,377 (238)

Time-Varying Kelvin Wake Model and Microwave Velocity Observation [PDF]

Sensors, 2020
In the synthetic aperture radar (SAR) imaging of ship-induced wakes, it is difficult to obtain the Doppler velocity of a Kelvin wake due to the lack of time-varying wake models and suitable radar equipment.
Jie Niu, Xingdong Liang, Xin Zhang
doaj   +6 more sources

Study on Doppler Spectra of Electromagnetic Scattering of Time-Varying Kelvin Wake on Sea Surface [PDF]

Sensors, 2022
In general, it is more practical to detect ship wake under the background of a complicated sea state than the ship directly. Thus, in this paper, the Doppler spectra of time-varying Kelvin wake on a time-varying sea surface are numerically investigated ...
Tian-Ci Yang, Ye Zhao, Guo-Shan Wu, Xin-Cheng Ren   +3 more
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Numerical Simulation of the Kelvin Wake Patterns

Applied Sciences, 2022
The ship wave is of great interest for wave drag and coastal erosion. This paper proposes a mechanism of ship wave transformation to explore the effects of ship speed and ship size on the waveform.
Xiaofeng Sun, Miaoyu Cai, Jingkui Wang, Chunlei Liu   +3 more
doaj   +3 more sources

An ALoGI PU Algorithm for Simulating Kelvin Wake on Sea Surface Based on Airborne Ku SAR [PDF]

Sensors
The airborne Synthetic Aperture Radar (SAR) has the advantages of high-precision real-time observation of wave height variations and portability in the high frequency band, such as the Ku band. In view of the Four Fast Fourier Transform (4-FFT) algorithm,
Limin Zhai, Yifan Gong, Xiangkun Zhang
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Study on Ship Kelvin Wake Detection in Numerically Simulated SAR Images

Remote Sensing, 2023
To improve ship safety and increase ship concealment, we introduce a nonconvex regularization with a Cauchy-based penalty for discussing the influence of ship parameters and speckle noise in numerically simulated SAR images.
Jingjing Wang, Lixin Guo, Yiwen Wei, Shuirong Chai   +3 more
doaj   +3 more sources

Identifiability of Kelvin Wakes in SAR Imageries: The Role of Time-Varying Characteristics and Decoherence Effect of Wake

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
The Kelvin wake, a distinctive ship-generated wave pattern in synthetic aperture radar (SAR) imagery, plays a vital role in advancing ocean observation theory.
Chengji Xu, Rui Qi, Xiaoqing Wang, Zhongzhen Sun   +3 more
doaj   +3 more sources

Kelvin-Mach wake in a two-dimensional Fermi sea [PDF]

Physical Review Letters, 2018
The dispersion law for plasma oscillations in a two-dimensional electron gas in the hydrodynamic approximation interpolates between $\Omega \propto \sqrt{q}$ and $\Omega \propto q$ dependences as the wave vector $q$ increases.
Kolomeisky, Eugene B., Straley, Joseph P.   +1 more
core   +6 more sources

Study on Kelvin wake scattering characteristics of turning ship

Zhongguo Jianchuan Yanjiu, 2023
ObjectiveThis study focuses on the turning ship Kelvin wake and its electromagnetic scattering characteristics in order to provide a theoretical foundation for the detection and recognition of nonlinear ship wakes.
Jianan YAN, Ding NIE, Min ZHANG
doaj   +2 more sources

Observations and computations of narrow Kelvin ship wakes

Journal of Ocean Engineering and Science, 2016
Computations of far-field ship waves, based on linear potential flow theory and the Hogner approximation, are reported for monohull ships and catamarans. Specifically, far-field ship waves are computed for six monohull ships at four Froude numbers F≡V/gL=
Francis Noblesse, Chenliang Zhang, Jiayi He, Yi Zhu, Chenjun Yang, Wei Li   +5 more
doaj   +2 more sources

Inferring free surface disturbance properties from Kelvin wakes using convolutional neural network

Flow
Kelvin wakes are fluid motions generated by a moving disturbance at a free surface. We present a machine learning-based framework for inferring the properties of such moving disturbances from the Kelvin-wake patterns.
Xuanting Hao
doaj   +3 more sources