An Improved Two-Scale Analytical Model for Bistatic Scattering of Wind-Driven Sea Surfaces

Yulin He;Yue Chen;Yu Mao Wu;Peng Liu
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Abstract

The two-scale model (TSM) has been widely used to calculate scattering from surfaces with multiple roughness scales. In our study, we derived an improved TSM based on the angular composite model (ACM), which expresses the calculation of the scattering coefficient as an integral over the surface angles, making it possible to accelerate the process by combining with Monte Carlo integration. In addition, any method can be employed to calculate the small-scale scattering. We use the first-order small-slope approximation model (SSA1) with wider applicability instead of the small perturbation model (SPM) to calculate the scattering contribution from small-scale rough surfaces. We analyze the roughness of short waves on anisotropic wind-driven sea surfaces, give numerical examples of horizontally polarized backscattering and bistatic scattering, taking into account the L-band and different wind speeds, and compare them with the measurement data, classic TSM (KA + SPM), facet-based TSM (KA + SSA1), closed-form two-scale model [bistatic anisotropic polarimetric TSM (BA-PTSM)], and second-order small-slope approximation model (SSA2) algorithms. The proposed bistatic scattering model is in general agreement with the classic model and is demonstrated to be more consistent with measurements at larger scattering angles and more insensitive to the cutoff wavenumber.
海风海面双基地散射的改进双尺度解析模型
双尺度模型(TSM)被广泛应用于多尺度表面的散射计算。在我们的研究中,我们基于角复合模型(ACM)推导了一种改进的TSM,该模型将散射系数的计算表示为表面角度上的积分,从而可以结合蒙特卡罗积分来加速这一过程。此外,可以采用任何方法计算小尺度散射。我们使用适用性更广的一阶小斜率近似模型(SSA1)来代替小摄动模型(SPM)来计算小尺度粗糙表面的散射贡献。分析了各向异性海面上短波的粗糙度,给出了考虑l波段和不同风速的水平极化后向散射和双基地散射的数值算例,并与实测数据、经典TSM (KA + SPM)、基于面的TSM (KA + SSA1)、闭式双尺度模型[双基地各向异性极化TSM (BA-PTSM)]和二阶小斜率近似模型(SSA2)算法进行了比较。本文提出的双基地散射模型与经典模型基本一致,并且与大散射角下的测量结果更一致,对截止波数更不敏感。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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