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Spectral Decomposition Method for Large Sea Surface Generation and Radar Backscatter Modeling

机译:大海面生成和雷达反向散射造型的光谱分解方法

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This paper analyzes different methods to simulate sea surface waves over a large area rapidly and with low computational complexity. Indeed, for wind speed between 1 and 10 m/s, the area of the sea surfaces must range from 10 to 92,000m(2) to account for all the surface roughness scales which can contribute to the scattering process at microwave frequencies. At frequencies higher than 10 GHz, a sampling rate of one tenth of the wavelength can lead to a prohibitive numerical cost. The impact of these approaches on the surface power spectral density and on the monostatic normalized radar cross section is investigated. The proposed methods consist of splitting the full sea surface height spectrum into sub-spectra of smaller extents. Sub-sea surfaces are generated and combined from different interpolation and recombination techniques. In this paper, an original closed-form expression of the resulting sea surface height spectrum is derived to interpret the simulation results. Finally, the efficiency of the methods in terms of accuracy and memory requirement is analyzed by computing the monostatic normalized radar cross section from sea surfaces with the first-order small slope approximation (SSA1) scattering model.
机译:本文分析了不同方法,以便快速模拟大面积和低计算复杂性的海面波。实际上,对于1到10米/秒的风速,海面的面积必须为10至92,000米(2),以考虑所有表面粗糙度尺度,这可以有助于微波频率的散射过程。在高于10GHz的频率下,波长十分之一的采样率可以导致禁止的数值成本。研究了这些方法对表面功率谱密度和单声道标准化雷达横截面的影响。所提出的方法包括将全海表面高度光谱分成较小范围的子光谱。产生亚海表面并从不同的内插和重组技术组合。在本文中,导出了所得海面高度谱的原始闭合表达式以解释模拟结果。最后,通过使用一阶小斜率近似(SSA1)散射模型从海面计算单声道标准化雷达横截面来分析在精度和内存要求方面的方法的效率。

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