Wide-band EM scattering from multiple dielectric targets above a dielectric rough sea surface based on maehly approximation

2017 ◽  
Author(s):  
Ran Bao ◽  
An Qi Wang ◽  
Zhi Xiang Huang
Keyword(s):  
Wide Band ◽  
Sea Surface ◽  
Em Scattering ◽  
Rough Sea Surface ◽  
Rough Sea

scholarly journals Electromagnetic Scattering Analysis of the Sea Surface with Single Breaking Waves

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jingjing Wang ◽  
Lixin Guo ◽  
Yiwen Wei ◽  
Shuirong Chai ◽  
Ke Li ◽  
...  
Keyword(s):  
Electromagnetic Scattering ◽  
Grazing Angle ◽  
Wave Model ◽  
Breaking Waves ◽  
Sea Surface ◽  
Breaking Wave ◽  
Frequency Method ◽  
Em Scattering ◽  
Rough Sea Surface ◽  
Rough Sea

A new electromagnetic (EM) scattering model of the sea surface with single breaking waves is proposed based on the high-frequency method in this paper. At first, realistic breaking wave sequences are obtained by solving the fluid equations which are simplified. Then, the rough sea surface is established using the linear filtering method. A new wave model is obtained by combining breaking waves with rough sea surface using a 3D coordinate transformation. Finally, the EM scattering features of the sea surface with breaking waves are studied by using shooting and bouncing rays and the physical theory of diffraction (SBR-PTD). It is found that the structure that is similar to a dihedral corner reflector between the breaking wave and rough sea surface exhibits multiple scattering, which leads to the sea-spike phenomenon that the scattering result of horizontal (HH) polarization is larger than that of vertical (VV) polarization, especially at low-grazing-angle (LGA) incidents with upwind. The sea-spike phenomenon is also closely related to the location of strong scattering.

An Improvement on SSA Method for EM Scattering From Electrically Large Rough Sea Surface

2016 ◽  
Vol 13 (8) ◽  
pp. 1144-1148 ◽  
Author(s):  
Jinxing Li ◽  
Min Zhang ◽  
Pengbo Wei ◽  
Wangqiang Jiang
Keyword(s):  
Sea Surface ◽  
Em Scattering ◽  
Rough Sea Surface ◽  
Rough Sea

scholarly journals Investigation of Range Profiles from a Simplified Ship on Rough Sea Surface and Its Multipath Imaging Mechanisms

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Siyuan He ◽  
Fan Zhang ◽  
Weidong Hu ◽  
Lei Zhuang ◽  
Xingbin Ye ◽  
...  
Keyword(s):  
Surface Current ◽  
Wide Band ◽  
Sea Surface ◽  
Ray Theory ◽  
Electric Conductor ◽  
Inverse Discrete Fourier Transform ◽  
Range Profile ◽  
Rough Sea Surface ◽  
Imaging Mechanisms ◽  
Rough Sea

The range profiles of a two-dimension (2 D) perfect electric conductor (PEC) ship on a wind-driven rough sea surface are derived by performing an inverse discrete Fourier transform (IDFT) on the wide band backscattered field. The rough sea surface is assuming to be a PEC surface. The back scattered field is computed based on EM numerical simulation when the frequencies are sampled between 100 MHz and 700 MHz. Considering the strong coupling interactions between the ship and sea, the complicated multipath effect to the range profile characteristics is fully analyzed based on the multipath imaging mechanisms. The coupling mechanisms could be explained by means of ray theory prediction and numerical extraction of the coupling currents. The comparison of the range profile locations between ray theory prediction and surface current simulation is implemented and analyzed in this paper. Finally, the influence of different sea states on the radar target signatures has been examined and discussed.

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