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海面与其上方双矩形截面柱复合散射的混合算法研究?
Study on comp osite electromagnetic scattering from the double rectangular cross-section columns ab ove rough sea surface using hybrid metho d
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摘要: 采用Pierson-Moscowitz(PM)海谱和Monte Carlo方法模拟实际的粗糙海面，基于矩量法和基尔霍夫近似的混合算法研究了海面与其上方双矩形截面导体柱的复合电磁散射特性，得出了复合散射系数的角分布曲线，计算了复合散射系数随海面参数、矩形截面柱参数以及入射波参数的变化情况，并做了详细分析与讨论，得到了PM谱海面与其上方双矩形截面柱复合散射特性。结果表明，与单纯的矩量法相比较，采用基于矩量法和基尔霍夫近似的混合算法，既可获得较高的准确性，同时又可减少计算时间和内存占用量，而且粗糙面尺度越大该优势越明显。Abstract: The actual rough sea surface is described by Pierson-Moscowitz (PM) spectrum and Monte Carlo method; the composite electromagnetic scattering from the double rectangular cross-section conductor columns above the rough sea surface is investigated using the hybrid method—the Method of Moment with the Kirchhoff approximation. Angular distribution curves of composite scattering coe?cient are obtained;and this coe?cient that varies with the parameter of sea surface, rectangular cross-section conductor columns and incident waves is calculated in detail. The characteristics of the composite scattering coe?cient from the double rectangular cross-section conductor columns above the rough sea surface are also obtained. Results show that the hybrid method—the Method of Moment with the Kirchhoff approxi-mation, compared to the traditional Method of Moment, can obtain higher accuracy. Moreover, the hybrid method can effectively reduce the computation time and memory footprint, and the performance becomes more favorable with the increase of the sizes of rough surface.
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