title: Convergence properties of a quadratic approach to the inverse-scattering problem.
abstract: The local-minima question that arises in the framework of a quadratic approach to inverse-scattering problems is investigated. In particular, a sufficient condition for the absence of local minima is given, and some guidelines to ensure the reliability of the algorithm are outlined for the case of data not belonging to the range of the relevant quadratic operator. This is relevant also when an iterated solution procedure based on a quadratic approximation of the electromagnetic scattering at each step is considered.
authors.affiliation: LightTrans GmbH, Wildenbruchstrasse 1a, 07745 Jena, Germany. pierri@unina.it
authors.forename: Raffaele
authors.initials: R
authors.lastname: Persico
authors.forename: Francesco
authors.initials: F
authors.lastname: Soldovieri
authors.forename: Rocco
authors.initials: R
authors.lastname: Pierri