| 一种方形腔体的目标散射特性及测量方法 |
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| 引用本文： | 赵京城,娄长玉,李家碧,杨宗凯.一种方形腔体的目标散射特性及测量方法[J].北京航空航天大学学报,2022,48(12):2415-2424. |
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| 作者姓名： | 赵京城 娄长玉 李家碧 杨宗凯 |
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| 作者单位： | 北京航空航天大学 电子信息工程学院, 北京 100191 |
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| 摘 要： | 雷达散射截面(RCS)是评价飞机隐身性能的重要指标，进气道对飞机的RCS有较大贡献，研究飞机进气道的散射有重要意义。相对于普通凸表面类型目标，进气道属于腔体，在远场条件计算、测量系统配置方面都需根据自身特有的散射机理做相应调整。借鉴矩形波导与远场关系理论，分析进气道等腔体类型目标的散射规律，判断进气道散射只与口面场有关。以一种方形腔体为例，采用几何光学法进行定量回波分析，通过电磁仿真软件FEKO进行仿真计算验证理论推导的正确性。在紧缩场和普通远场2种环境下，对腔体目标进行RCS对比测量研究。数值计算和实验测量的结果表明:对进气道等腔体类目标进行散射测量时，测试场仅需保证口面尺寸满足远场条件即可，但是测量系统需要具备2~5倍进气道长度的测量能力。
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| 关 键 词： | 进气道 腔体散射特性 远场条件 数值计算 雷达散射截面 测量系统 |
| 收稿时间： | 2021-03-16 |
Scattering characteristics and measurement method of a square cavity |
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| Affiliation: | College of Electronic Information Engineering, Beihang University, Beijing 100191, China |
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| Abstract: | Radar cross section (RCS) is an important index to evaluate the stealth performance of aircraft. As the inlet has a great contribution to the RCS of aircraft, it is significant to the study of the scattering of aircraft inlet. Compared with the common convex surface target, the inlet belongs to the cavity, so the far-field condition calculation and measurement system configuration should be adjusted according to its own unique scattering mechanism. Based on the theory of the relationship between rectangular waveguide and far field, the scattering law of cavity type targets such as inlet is analyzed. Taking a square cavity as an example, the quantitative echo analysis is carried out by using geometrical optics method, and the correctness of the theoretical derivation is verified by FEKO simulation. The RCS of the cavity target is measured in the compact field and the far field. The results of numerical calculation and experimental measurement show that when measuring the scattering of cavity like targets such as inlet, the test field only needs to ensure that the size of the inlet surface meets the far-field conditions, but the measurement system needs to have the measurement ability of 2~5 times the length of the inlet. |
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