Application of iterative moment-method solutions to ocean surface radar scattering
Application of iterative moment-method solutions to ocean surface radar scattering
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DOI：
10.1109/8.655459
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发表时间：
1998
影响因子：
5.7
通讯作者：
D. J. Donohue;H. Ku;D. Thompson
中科院分区：
文献类型：
--
作者：
D. J. Donohue;H. Ku;D. Thompson
带状矩阵迭代法等数值方法代表了粗糙表面波散射直接数值模拟的重大进展。本文研究了BMIA等迭代方法在海洋雷达散射中的应用。结果表明，对于典型的微波雷达频率和海面粗糙度，BMIA实际上是有限的。因此，提出了一种基于多网格分解和广义共轭残差（GCR）方法的更一般的迭代解。多网格方法非常适合于宽带海面，因为它解决了一系列网格上的散射问题，每个网格对应于不同的空间频率范围或长度尺度。本文将该方法应用于几种海面散射问题，包括非常低的掠掠角和水平和垂直极化。在适当的范围内，与摄动理论得到了很好的一致性，并再现了雷达后向散射数据的几个定性特征。
Numerical methods such as the banded matrix iterative approach (BMIA) represent a major advance in the direct numerical simulation of rough surface-wave scattering. This paper considers the application of iterative methods such as the BMIA to ocean-radar scattering. It is shown that for typical microwave radar frequencies and sea-surface roughness, the BMIA is actually of limited use. A more general iterative solution based on a multigrid decomposition and the generalized conjugate residual (GCR) method, is thus developed. The multigrid approach is ideally suited to the broad-band ocean surface, as it solves the scattering problem on a sequence of grids, each corresponding to a different range of spatial frequencies or length scales. This approach is applied here to several sea scattering problems, including very low grazing angles and both horizontal and vertical polarization. Good agreement is obtained with perturbation theory in the appropriate limits and several qualitative characteristics of radar backscatter data are reproduced.