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Electromagnetic backscattering from one-dimensional drifting fractal sea surface II:Electromagnetic backscattering model |
| Tao Xie(谢涛)1,2, William Perrie3, Shang-Zhuo Zhao(赵尚卓)1,2, He Fang(方贺)1,2, Wen-Jin Yu(于文金)1,2, Yi-Jun He(何宜军)1,2 |
1 School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2 Jiangsu Engineering Technology Research Center of Marine Environment Detection, Nanjing 210044, China;
3 Bedford Institute of Oceanography, B2Y 4A2, Dartmouth, NS, Canada |
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Abstract Sea surface current has a significant influence on electromagnetic (EM) backscattering signals and may constitute a dominant synthetic aperture radar (SAR) imaging mechanism. An effective EM backscattering model for a one-dimensional drifting fractal sea surface is presented in this paper. This model is used to simulate EM backscattering signals from the drifting sea surface. Numerical results show that ocean currents have a significant influence on EM backscattering signals from the sea surface. The normalized radar cross section (NRCS) discrepancies between the model for a coupled wave-current fractal sea surface and the model for an uncoupled fractal sea surface increase with the increase of incidence angle, as well as with increasing ocean currents. Ocean currents that are parallel to the direction of the wave can weaken the EM backscattering signal intensity, while the EM backscattering signal is intensified by ocean currents propagating oppositely to the wave direction. The model presented in this paper can be used to study the SAR imaging mechanism for a drifting sea surface.
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Received: 20 October 2015
Revised: 12 January 2016
Accepted manuscript online:
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PACS:
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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84.40.Xb
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(Telemetry: remote control, remote sensing; radar)
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91.50.Iv
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(Marine magnetics and electromagnetics)
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92.10.Hm
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(Ocean waves and oscillations)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 41276187), the Global Change Research Program of China (Grant No. 2015CB953901), the Priority Academic Program Development of Jiangsu Higher Education Institutions, China, the Program for the Innovation Research and Entrepreneurship Team in Jiangsu Province, China, the Canadian Program on Energy Research and Development, and the Canadian World Class Tanker Safety Service Program. |
Corresponding Authors:
Tao Xie
E-mail: xietao@nuist.edu.cn
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Cite this article:
Tao Xie(谢涛), William Perrie, Shang-Zhuo Zhao(赵尚卓), He Fang(方贺), Wen-Jin Yu(于文金), Yi-Jun He(何宜军) Electromagnetic backscattering from one-dimensional drifting fractal sea surface II:Electromagnetic backscattering model 2016 Chin. Phys. B 25 074102
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