Numerical study of electromagnetic scattering from one-dimensional nonlinear fractal sea surface |
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Authors: | Xie Tao He Chao William Perrie Kuang Hai-Lan Zou Guang-Hui and Chen Wei |
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Institution: | School of Information Engineering, Wuhan University of Technology, Wuhan 430070, China; Bedford Institute of Oceanography, B2Y 4A2, Dartmouth, NS, Canada |
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Abstract: | In recent years, linear fractal sea surface models have
been developed for the sea surface in order to establish an
electromagnetic backscattering model. Unfortunately, the sea surface
is always nonlinear, particularly at high sea states. We present a
nonlinear fractal sea surface model and derive an electromagnetic
backscattering model. Using this model, we numerically calculate the
normalized radar cross section (NRCS) of a nonlinear sea surface.
Comparing the averaged NRCS between linear and nonlinear fractal
models, we show that the NRCS of a linear fractal sea surface
underestimates the NRCS of the real sea surface, especially for sea
states with high fractal dimensions, and for dominant ocean surface
gravity waves that are either very short or extremely long. |
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Keywords: | fractals nonlinearities sea surface electromagnetic
scattering |
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