摘要
二面角效应是高分辨率SAR图像非常重要的特征,其主要是建筑物的墙面和地面及其他人造物体形成的二面角造成的强反射。为了减小二面角的雷达散射截面积(Radar cross section,RCS),常用的技术是改变二面角的几何结构。双基地雷达是一种几何配置灵活的雷达,具有一定的反隐身能力。本文主要利用几何光学分析了不同张角二面角的散射特性及其SAR图像表现形式。针对二面角的多次散射问题,计算了散射次数和最终出射角度的通项公式,并给出了双基地条件下二面角RCS的定量计算公式。仿真结果表明,不同张角的二面角RCS和双基地雷达的几何结构密切相关,在特定的双基地雷达几何配置下,二面角在双基地SAR图像中表现为角点处的强点。
Dihedral corner effect is an important characteristic of SAR images, especially for the strong scatters generated by buildings and other human-made objects. Changing the opening angle of the dihedrals is a popular method to reduce radar cross section（RCS）. Bistatic radar, which has flexible geomet- ric configuration, is a good way to detect stealth targets. This paper analyzes the bistatic scattering char- acteristic of different dihedral corner reflectors using geometrical optics methods. As for the multiple scattering effect in the dihedral corners, the general term formula is given to describe the multiple scat- tering times and echo angles. Besides, the RCS calculation formula of dihedral corner is extended to hi- static condition. Both theory and simulation results show that bistatic radar has the ability to detect changed dihedral corners and its bistatic SAR image formation is a strong point at the corner point under a certain bistatic angle.
出处
《数据采集与处理》
CSCD
北大核心
2016年第4期675-687,共13页
Journal of Data Acquisition and Processing
基金
国家自然科学基金(61120106004
61225005
61427802
61471038)资助项目
长江学者奖励计划(T2012122)资助项目
科技北京百名领军人才培养工程(YETP1168)
"111"引智工程(B14010)资助项目
关键词
二面角
双基地雷达
散射特性
SAR图像
dihedral corner reflector
bistatic radar
scattering characteristic
SAR image
