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改进的二维分形模型在海面电磁散射中的应用
  • 期刊名称：物理学报, 55(10), pp.5191-5199, 2006.
  • 时间：0
  • 分类：O241[理学—计算数学;理学—数学]
  • 作者机构：[1]西安电子科技大学理学院,西安710071
  • 相关基金：国家自然科学基金（批准号：60571058）、国防科技预研基金和西安电子科技大学研究生创新基金资助的课题.
  • 相关项目：实际海背景中目标的复合电磁散射与预报模型研究
关键词： 改进分形模型, 粗糙海面, 电磁散射, Kiwhhoff近似, improved fractal model, rough sea surface, electromagnetic scattering, Kirchhoff approximation
中文摘要：

提出了一种改进的二维分形海面模型，其表面谱函数在空间波数小于基波波数及大于基波波数时分别满足正幂率关系和负幂率关系．通过比较可以发现在不同风速时，改进模型的空间自相关函数及表面轮廓谱和有关文献结果有较好的吻合．在满足Kirchhoff近似条件下推导了改进分形模型的散射系数及散射强度系数的计算公式并进行了数值计算，比较了改进模型和经典模型的后向散射强度系数角分布并详细讨论了它们随入射频率、海上风速和风向的变化。

英文摘要：

In this paper, an improved 2D fractal model is present for modeling the sea surface, the fractal spectrum of which satisfies the positive or negative power law for spatial wave numbers smaller or larger than the fundamental wave number, respectively. The spatial correlation function and the spectrum of this improved model show good agreements with those given in the literature for different windspeed. Based on the Kirchhoff approximation, the scattering coefficient and the scattering intensity coefficient of this new model are derived and evaluated. The angular distributions of backscattering intensity coefficient of the improved fractal sea model are compared with those of the conventional model, the influence of the incident frequency, windspeed and winddirection on the backscattering intensity coefficient is also discussed in detail.

同期刊论文项目
实际海背景中目标的复合电磁散射与预报模型研究
期刊论文 71 会议论文 19 获奖 1
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