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2012-11-01
Investigation on the Scattering from One-Dimensional Nonlinear Fractal Sea Surface by Second-Order Small-Slope Approximation
By
Progress In Electromagnetics Research, Vol. 133, 425-441, 2013
Abstract
In this paper, a one-dimensional nonlinear fractal sea surface model has been established based on the narrow-band Lagrange model, which takes into account the vertical and horizontal skewnesses for the sea surface. By using the method of second-order small-slope approximation (SSA-II), the normalized radar cross section (NRCS) and Doppler spectrum of linear and nonlinear fractal sea surface are calculated. The calculated NRCS of the nonlinear fractal sea surface is larger than the linear surface for backscattering, especially for large incidence angles, which indicates the nonlinear surface has stronger scattering echoes. And the result of nonlinear fractal sea surface is also larger than the linear fractal sea surface for bistatic case, which is characterized as the discrepancies being small near specular direction, while the discrepancies becoming larger as the scattering angles departing from the specular direction. For the Doppler spectrum of sea surface, the nonlinearity of sea surface effects greatly enhances the Doppler shift and the Doppler spectrum bandwidth at large incidence angles, which are attributed the fact that the nonlinear-wave components propagate faster than the linear-wave components and the nonlinear fractal sea surface corrects the phase velocities by adding the horizontal and vertical skewness. And also, all the results can indicate the validity of this nonlinear model.
Citation
Gen Luo, and Min Zhang, "Investigation on the Scattering from One-Dimensional Nonlinear Fractal Sea Surface by Second-Order Small-Slope Approximation," Progress In Electromagnetics Research, Vol. 133, 425-441, 2013.
doi:10.2528/PIER12082706
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