On the Combination of SAR and Model Based Techniques for High-Resolution Real-Time Two-Dimensional Reconstruction

Abstract

Abstract-A novel, real-time, two-dimensional method to find the shape of a body from its scattered electric fields is presented. The method is based on a unique combination of the information obtained from the target using the SAR formulation with a novel fast model-based inversion. In the first step, a fast implementation of the SAR inversion is used to recover an initial estimate of the body shape. Secondly, the phase and amplitude of the SAR image are used to extract a set of first guess contours close to the actual position of the body under test. In a third step, these contours are used as a starting point for a model-based inversion in order to disregard the contours that do not match the body profile and to improve the final result. Resolution of less than half of a wavelength for the proposed method is achieved using representative simulation results and measured data

A Synthetic Aperture Radar (SAR)-Based Technique for Microwave Imaging and Material Characterization

“…The price to pay is a high calculation time, mainly due to the iterative nature of algorithms. Hybrid backpropagation and model-based techniques have been also considered in order to obtain accurate imaging results [15]. In these cases, the former is used to provide a first guess of the profile of the target/OUT for the latter method.…”