Doppler Shifts of Backscattering Fields from One Dimensional Linear and Nonlinear Oceanic Surface by SSA-II
Doppler Shifts of Backscattering Fields from One Dimensional Linear and Nonlinear Oceanic Surface by SSA-II
复制标题
DOI：
10.1088/0256-307x/27/10/104101
复制
发表时间：
2010-10
影响因子：
3.5
通讯作者：
Wang Yun-hua;Zhang Yan-min;G. Lixin
中科院分区：
文献类型：
--
作者：
Wang Yun-hua;Zhang Yan-min;G. Lixin
基于二阶小斜率近似（SSA-II）的一般框架，预测了线性和非线性水动力海面后向散射场的多普勒频移。在不同的雷达频率从近天底到中等掠入射角进行比较。非线性流体动力学模型的多普勒频移比线性表面的多普勒频移稍大。同时，多普勒频移的风速和雷达极化的依赖关系也进行了分析，并进行比较，以确认偏振和风速的敏感性。与此同时，给出了微扰法（SPM）和几何光学近似（GO）的计算结果。
Based on the general framework of the second order small slope approximation (SSA-II), Doppler shifts of backscattered fields from linear and nonlinear hydrodynamic sea surfaces are predicted. Comparisons are performed at incidence angles varying from near-nadir to moderate-grazing for different radar frequencies. The predicted Doppler shifts for nonlinear hydrodynamic model are somewhat larger than the results corresponding to linear surface. Meanwhile, the dependences of the Doppler shifts on the wind speed and radar polarizations are also analyzed, and the comparisons are shown to confirm the sensitivities to the polarization and wind speed. At the same time, the results of the small perturbation method (SPM) and geometrical optics approximation (GO) are also presented for comparisons.