| 高速运动介质球的散射特性研究 |
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| 引用本文： | 李应乐.高速运动介质球的散射特性研究[J].咸阳师范学院学报,2005,20(2):16-19. |
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| 作者姓名： | 李应乐 |
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| 作者单位： | 咸阳师范学院科研处,陕西,咸阳,712000 |
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| 基金项目： | 陕西省教育厅专项基金资助项目(编号:03JK070)。 |
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| 摘 要： | 研究了高速运动的介质目标对任意频率电磁渡的散射,系统地导出了坐标系相对沿着z轴运动时的坐标变换关系、波矢量变换关系以及电磁场的变换关系。首次给出了两个相对作高速匀速运动的球坐标系中的三角函数的变换关系以及矢量的球坐标分量的变换关系,为研究高速运动目标的电磁波散射奠定了理论基础。利用Mie理论。详细地研究了高速运动介质球的散射特性,得到了散射截面的解析表达式并对其进行了仿真和讨论。结果表明:介质球做高速运动时,前向散射大于后向散射,和其它的观察方位相比,入射波频率对散射的影响不大,多普勒效应起主要作用,目标表面上的二次辐射源以电偶极辐射为主。
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| 关 键 词： | 电磁散射 高速运动 三角函数变换 |
| 文章编号： | 1672-2914(2005)02-0016-04 |
| 修稿时间： | 2005年2月16日 |
Investigation of Scattering Characteristics for A Medium Sphere Moving in High Velocity |
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| LI Ying-le.Investigation of Scattering Characteristics for A Medium Sphere Moving in High Velocity[J].Journal of Xianyang Normal University,2005,20(2):16-19. |
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| Authors: | LI Ying-le |
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| Abstract: | The scattered field by a medium sphere moving in high velocity is investigated, when the incident wave is of arbitrary frequency. First the coordinates' transformation, vectors' transformation and the electromagnetic transformation are derived in detail, when one coordinate system moves to another one along their z-axes. The transformation of trigonometric function and that of the components of vector in spherical coordinates, for the first time, are presented. These transformations establish a theoretic basis for studying the scattered field by a target moving in high velocity. Utilizing Mie theory, the scattered characteristic of medium sphere moving in high speed is investigated in detail. The expression of scattering section is obtained and simulations of that are presented. Results show that the forward scattered field is larger than that of the backward, as the sphere moves in high speed. The forward and backward scattering fields are not much influenced by the operating frequency and The Doppler effect plays a main role. The second radiant on the surface of the target is mainly of electric dipole radiation. |
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| Keywords: | Electromagnetic scattering high-speed movement trigonometric function transformation |
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