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粗糙表面涂覆目标的太赫兹波散射特性研究
Terahertz scattering prop erty for the coated ob ject of rough surface
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摘要: 对具有涂覆层目标的太赫兹波段粗糙表面的散射特性进行了研究。考虑到表面粗糙度的影响，可先对反射系数进行修正，再利用反射系数对等效电磁流进行修正，得到粗糙涂覆表面的等效电磁流，然后在物理光学方程的基础上得到粗糙表面涂覆目标的雷达散射截面；最后进行图形电磁学可视化计算，并采用Visual C++对模型进行OpenGL显示，提取像素面元的有效信息对所得理论进行了仿真分析，研究了不同入射角度、不同频率、不同介质、不同粗糙度和不同涂层厚度下的太赫兹波电磁散射特性，得到了一些有参考价值的结论。Abstract: The scattering of the radar signal by the coated target of a rough surface in the terahertz wave is studied. Considering the roughness of the surface, reflection coe?cient is modified for the rough surface. The modified equivalent current can be obtained by using the reflection coe?cient. Then using the modified equivalent current and the physical optics solution, the radar cross section of the coated object with the rough surface is obtained. And combining the graphical electromagnetic computing method, simulations to validate the formulation are performed. Numerical results for several coated bodies such as cylinder and cone-sphere geometry are given and discussed from different angles of incidence, different frequencies, different materials, different roughness values, and different coating thickness values.
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