超宽带电磁脉冲二维金属柱体时域逆散射成像的研究

The Research of Time-Domain Inverse Scattering Imaging Approach for 2-D Metallic Cylinder Using Ultra-Wide Band Electromagnetic Pulse

本文研究了利用超宽带电磁脉冲对二维金属散射体进行成像算法 ,通过参考LSF算法〔5～ 8〕的基本思想 ,基本克服了Born迭代法在处理金属散射体时理论上的缺陷。并通过对求解大型“病态”线性方程组算法的改进 ,提高了二维金属散射体的时域逆散射成像算法的稳定性和二维金属散射体 (尤其是在存在多个散射体的情况下 )的成像质量。

In this paper, the imaging algorithm for multiple 2 D metallic scatterers using ultra wide band electromagnetic pulse based by the concept of 'Local shape function'(LSF) is developed. The imaging algorithm can annihilate the faults caused by using Born's iteration which is good as applying in imaging of dielectric targets. With the regularization technology and Chebyshev pre conditioning technology for 'ill posed' problems, the stability of solving the great scale 'ill posed' linear equations is improved. With above processing, the better resolution image of the perfect conductor, especially in case of multiple metallic scatterers can be obtained. At the end of this paper, some corresponding experimental results that proved the efficiency of the imaging algorithm for 2 D perfect conductive scatterers are given.