Polarimetric Scattering Analysis for a Finite Dihedral Corner Reflector
Polarimetric Scattering Analysis for a Finite Dihedral Corner Reflector
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DOI：
10.1093/ietcom/e89-b.1.191
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
K. Hayashi;R. Sato;Y. Yamaguchi;Hiroyoshi Yamada
中科院分区：
文献类型：
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作者：
K. Hayashi;R. Sato;Y. Yamaguchi;Hiroyoshi Yamada
本文研究了有限尺寸二面角反射器的极化散射特性。二面角反射器是城市中双反射结构的一种基本模型。详细的散射信息服务于极化合成孔径雷达（POLSAR）数据分析的解释。由于时域有限差分法（FDTD）在目标形状建模中的简单性和灵活性，本文采用FDTD方法进行散射计算。本文指出，对于理想电导体和介质角反射器，都存在一个稳定的双反射斜视角区域。超出这个稳定的斜视角区域，散射特性变得与假设的响应完全不同。基于物理光学（PO）近似，提出了一种双反射散射判据。给出了偏振指数（共偏振比）随斜视角变化的详细分析和在电波暗室中测量的实验结果。
This paper examines polarimetric scattering characteristics caused by a dihedral comer reflector of finite size. The dihedral corner reflector is a basic model of double-bounce structure in urban area. The detailed scattering information serves the interpretation of Polarimetric Synthetic Aperture Radar (POLSAR) data analysis. The Finite-Difference Time-Domain (FDTD) method is utilized for the scattering calculation because of its simplicity and flexibility in the target shape modeling. This paper points out that there exists a stable double-bounce squint angle region both for perfect electric conductor (PEC) and dielectric comer reflectors. Beyond this stable squint angular region, the scattering characteristics become completely different from the assumed response. A criterion on the double-bounce scattering is proposed based on the physical optics (PO) approximation. The detailed analyses on the polarimetric index (copolarization ratio) with respect to squint angle and an experimental result measured in an anechoic chamber are shown.