论文部分内容阅读
该文探讨利用时域散射场信息探测半无限大空间中二维目标.半无限大空间中目标的探测具有明显的实际应用价值,但相对自由空间而言,这种探测要困难得多,因而至今很少有人进行这方面的研究.该文给出一种基于体等效原理的探测半无限大空间中二维目标的方法,利用体等效原理,得到反映时域散射场和目标介电参数分布之间关系的体积分方程,经傅立叶变换并离散化后得到反演方程.这是一种选代方法,从一阶玻恩近似开始迭代,每次迭代过程中正问题和逆问题各计算一次,正问题采用FDTD方法.为了克服问题的病态,采用了伪求逆技术.文中用平面波展开法推导了半无限大空间中线源激励下的格林函数.文中列举了几个具有代表性的例子,最后讨论了有关的几个问题.
This paper explores the use of time-domain scattering field information to detect two-dimensional objects in semi-infinite space. The exploration of targets in semi-infinite space has obvious practical value. However, this exploration is much more difficult than free space, and so far few researches have been done in this field. This paper presents a method based on volume equivalence principle for detecting two-dimensional objects in semi-infinite space. By using volume equivalence principle, a volume integral equation reflecting the relationship between the time-domain scattering field and the target dielectric parameter distribution is obtained. After Fourier transform and discretization obtained inversion equation. This is an alternative method, starting from the first-order Born approximation iteration, each iterative process positive and inverse problems are calculated once, the problem is FDTD method. In order to overcome the ill-posedness of the problem, a pseudo-inverse technique was used. In this paper, the Green’s function under the excitation of a line source in a semi-infinite space is derived by the plane wave expansion method. The article lists a few representative examples and concludes with a discussion of a few issues.