Abstract: A number of effective procedures for improving the distorted Born iterative method are proposed, including the accurate and efficient solution of the direct problem, second-difference regularization, weighted least-squares solution, estimation of the initial guess by using a priori information and multiple-frequency scheme. The convergence and stability of the iterative solution and the resolution, of the reconstruction are improved significantly.

Key words: Born iterative method, electromagnetic inverse scattering, profile reconstruction, regularization