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An Improved Two-Scale Model for Electromagnetic Backscattering From Sea Surface

机译：一种改进的海面电磁背散射模型

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摘要

Based on composite rough surface and stochastic multiscale models, an improved two-scale model (TSM) is proposed. Different from the classical TSM, the proposed method adopts the integral equation method (IEM) to replace the small perturbation method (SPM) for calculating the contribution from small-scale roughness. Kirchhoff approximation (KA) is still kept in the model to calculate the contribution from large-scale roughness. Because the IEM has wider application range than the SPM, the proposed model exhibits a higher accuracy and has a wider application range in terms of sea surface roughness compared with the classical TSM. Usually, the classical TSM is sensitive to the cutoff wavenumber. The proposed model adopts an adaptive cutoff wavenumber instead of choosing a cutoff wavenumber in the classical TSM. The effectiveness of the proposed model is demonstrated through comparisons with the simulation results of multilevel fast multipole algorithm (MLFMA) and the measured results. Different roughness at different frequencies is analyzed as well.
机译：基于复合粗糙表面和随机多尺度模型，提出了一种改进的两尺度模型（TSM）。不同于经典TSM，所提出的方法采用整体方程方法（IEM）来替换小扰动方法（SPM）来计算小规模粗糙度的贡献。 Kirchhoff近似（KA）仍然保持在模型中，以计算大规模粗糙度的贡献。由于IEM具有比SPM更宽的应用范围，所提出的模型表现出更高的精度，并且与古典TSM相比，在海面粗糙度方面具有更广泛的应用范围。通常，经典TSM对截止波数敏感。所提出的模型采用自适应截止波数，而不是在经典TSM中选择截止波数。通过与多级快速多极算法（MLFMA）的仿真结果和测量结果的比较来证明所提出的模型的有效性。还分析了不同频率的不同粗糙度。

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