基于近区后向散射场幅度的二维导体目标的逆散射

本文给出了一种改进的基于多方向多入射频率的平均波照射下的近区散射场度测量值反演导体目标轮廓的逆散射场的幅度值反演导体目标轮廓的逆散射方法。

2-D Conductor Cross Section Reconstruction via Amplitudes of Backscattered Field in Near Region

In this paper, an improved approach is presented to reconstruct two dimensional conductor profile illuminated by incident plane waves of multiple frequencies and directions via amplitudes of backscattered field in uear regions. Newton-Kantorovich algorithm is adopted to cast the nonlinear coupled integral conupled integral equations into linearized form, method of moment is used to transform the above linearized integral equations into matrix form, the resulting ill-posed overdetermined linear equations are solved using pseudoinverse technique based on Gram-Schedmit orthogonal procedure. Initial values are determined by solving a nonlinear least square error problem to establish an equivalent circular cylinder. The effects of various parameters on reconstruction quality are discussed in numerical results and analysis, and it is shown by numerical results that 27dB SNR tolerance of backscattered electrical field amplitude is permissible to obtain good reconstruction result when only additive Gaussian noise is considered.