互易定理在目标电磁散射特性分析中的应用
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摘要
为了研究目标的电磁散射特性,先将导体球的散射问题等效为其外水平偶极子的散射,然后利用互易定理推导了水平偶极子的散射场并计算了导体球的雷达散射截面(RCS).计算结果表明,当水平偶极子相对于导体球运动时,导体球近场的RCS大于远场的RCS;近场区导体球的RCS变化大,但远场区导体球的RCS基本不随距离变化,而是趋近于几何光学值;此外,远场区的双站RCS随角度的变化在E平面和H平面也有很大的不同.
For purpose of studying the targets' EM scattering characteristics, the scattering of conducting sphere can be equivalent to that of its outer horizontal dipole, then the scattering field of the horizontal dipoles is derived and its radar cross section(RCS) is computed by applying the reciprocity theorem in this paper. The calculation results show that the RCS of the conducting sphere in the near field is greater than that in its distant field when the horizontal dipole moving relatively to the sphere, its RCS in near field changes greatly, but its RCS in the distant field doesn't vary basically with the distance while approaching to the geometrical optics value, and moreover, the bi-static RCS's changing with the incident angle in distant field is of big difference respectively in E and H planes.
For purpose of studying the targets' EM scattering characteristics, the scattering of conducting sphere can be equivalent to that of its outer horizontal dipole, then the scattering field of the horizontal dipoles is derived and its radar cross section(RCS) is computed by applying the reciprocity theorem in this paper. The calculation results show that the RCS of the conducting sphere in the near field is greater than that in its distant field when the horizontal dipole moving relatively to the sphere, its RCS in near field changes greatly, but its RCS in the distant field doesn't vary basically with the distance while approaching to the geometrical optics value, and moreover, the bi-static RCS's changing with the incident angle in distant field is of big difference respectively in E and H planes.
引文
[1]鲁述,徐鹏根.电磁场边值问题解析方法[M].武汉:武汉大学出版社,2005:17-22.
[2]邹军,李俊杰.电磁场反应原理与线性电路多端口互易定理[J].电气电子教学学报,2011,33(1):23-26.
[3]梁昌洪,陈曦.电磁互易对称性和无耗对称性[J].电气电子教学学报,2009,31(4):1-5.
[4]饶明忠,谭博学,魏佩瑜.广义电磁互易定理及其在涡流无损检测中的应用[J].电工技术学报,1999,14(2):47-50.
[5]黄培康,殷红成,许小剑.雷达目标特性[M].北京:电子工业出版社,2003:10-12.
[2]邹军,李俊杰.电磁场反应原理与线性电路多端口互易定理[J].电气电子教学学报,2011,33(1):23-26.
[3]梁昌洪,陈曦.电磁互易对称性和无耗对称性[J].电气电子教学学报,2009,31(4):1-5.
[4]饶明忠,谭博学,魏佩瑜.广义电磁互易定理及其在涡流无损检测中的应用[J].电工技术学报,1999,14(2):47-50.
[5]黄培康,殷红成,许小剑.雷达目标特性[M].北京:电子工业出版社,2003:10-12.