Doppler Spectra From a Two-Dimensional Ocean Surface at L-Band
Doppler Spectra From a Two-Dimensional Ocean Surface at L-Band
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DOI：
10.1109/tgrs.2006.873580
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发表时间：
2006-08
影响因子：
8.2
通讯作者：
G. Soriano;M. Joelson;M. Saillard
中科院分区：
文献类型：
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作者：
G. Soriano;M. Joelson;M. Saillard
一个近似的时间谐波三维电磁边界积分方法，小斜率积分方程，结合Creamer表面表示的级数展开，在二阶相对于高度，表示为Creamer（2）。由此产生的模型提供了在L波段的非线性海洋表面多普勒频谱的低数值模拟成本。作为近似的结果，该模型是为低风速设计的，通常高达5 m/s。结果表明，直接应用二阶模型，如Creamer（2）的半经验海面光谱诱导不切实际的放大小尺度粗糙度，在微波频率的散射过程中所涉及的。因此，本文提出了一个裸露的版本的皮尔逊-莫斯科维茨频谱，纠正这种神器。在L波段和70度入射全极化多普勒模拟。概述了地面非线性的影响，模拟的多普勒频谱显示出相对于风速和风向的正确变化
An approximate time-harmonic three-dimensional electromagnetic boundary-integral method, the small-slope integral equation, is combined with a series expansion of the Creamer surface representation at second order with respect to the height, denoted by Creamer (2). The resulting model provides at low numerical cost simulations of the nonlinear ocean surface Doppler spectrum at L-band. As a result of approximations, the model is designed for a low-wind speed, typically up to 5 m/s. It is shown that applying directly a second-order model such as Creamer (2) to a semiempirical sea surface spectrum induces an unrealistic magnification of small-scale roughness that is involved in the scattering process at microwave frequencies. This paper thus proposes an undressed version of the Pierson-Moskowitz spectrum that corrects this artifact. Full-polarized Doppler simulations at L-band and 70deg incidence are presented. Effects of the surface nonlinearities are outlined, and the simulated Doppler spectra show correct variations with respect to wind speed and direction