A generalized cross validation method for the inverse problem of 3-D Maxwell's equation (Q629577)

Summary: The inverse problem of estimation of the electrical conductivity in the Maxwell's equation is considered, which is reformulated as a nonlinear equation. The generalized cross validation (GCV) is used to estimate the global regularization parameter and the damped Gauss-Newton is applied to impose local regularization. The damped Gauss-Newton method requires no calculation of the Hessian matrix which is expensive for traditional Newton method. GCV method decreases the computational expense and overcomes the influence of nonlinearity and ill-posedness. The results of numerical simulation testify that this method is efficient.