In this paper we address the problem of modeling the electromagnetic scattering from targets at high frequencies as scattering centers. Scattering center models are low dimensional parametric models, that are of specific interest for automatic target recognition (ATR). The main problem with scattering center parameter estimation is the aspect dependence of range and amplitude of a scattering center. We will in this paper use scattering centers whose amplitude-aspect dependence are modeled as a polynomial of some degree, and whose range-aspect dependence are modeled as a second order polynomial. The Cramer Rao bound is derived for this problem, and estimation errors for some simple cases are illustrated. An iterative estimator for the parameters of this scattering center model is also presented, and some simple examples illustrate its performance.© (2002) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.