| 椭球粒子对电磁波散射的系统辨识模型 |
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| 引用本文： | 李应乐,弓树宏,黄际英. 椭球粒子对电磁波散射的系统辨识模型[J]. 兰州大学学报(自然科学版), 2005, 41(2): 81-85 |
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| 作者姓名： | 李应乐 弓树宏 黄际英 |
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| 作者单位： | 1. 西安电子科技大学,理学院,陕西,西安,710071;咸阳师范学院,科技产业处,陕西,咸阳,712000
2. 西安电子科技大学,理学院,陕西,西安,710071 |
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| 基金项目： | 中国科学院资助项目，陕西省教育厅资助项目 |
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| 摘 要： | 利用球形粒子的Mie解逼近椭球粒子的内外透射场与散射场,首先建立了求解任意椭球粒子对电磁波散射的系统辨识模型,在毫米波段,数值计算了非球形雨滴的内外电磁场和微分散射截面.结果表明雨滴的前向散射场大于后向散射场,后向散射场无径向分量,较大的球粒子的Mie解对椭球粒子的内外场的贡献较大,椭球引起的交叉极化分辨率随观察点的变化而变化;讨论了进一步提高计算精度的方法.
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| 关 键 词： | 系统辨识 椭球粒子 散射 电磁波 |
| 文章编号： | 0455-2059(2005)02-0081-05 |
System identification model for the scattering electromagnetic wave by an ellipsoidal particle |
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| LI Ying-le,GONG Shu-hong,HUANG Ji-ying. System identification model for the scattering electromagnetic wave by an ellipsoidal particle[J]. Journal of Lanzhou University(Natural Science), 2005, 41(2): 81-85 |
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| Authors: | LI Ying-le GONG Shu-hong HUANG Ji-ying |
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| Abstract: | The systematic identification model for solving scattering electromagnetic field for an ellipsoidal particle is presented utilizing the electromagnetic field of a sphere to approach that of an ellipsoidal particle. In a millimeter wave band, electromagnetic fields both inside and outside a non-spherical raindrop and its differential scattering section are numerically calculated. The results show that, for a raindrop, the forward scattering field is larger than the backward, there is no radial scattering field in the backward and the Mie solution for a large sphere contributes more to an ellipsoid's solution than that of a small ball. The cross polarization discrimination induced by a raindrop varies with the observing point. The method for further improving the computing accuracy is discussed. |
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| Keywords: | systematic identification ellipsoidal particle scattering electromagnetic wave |
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