An Efficient Scattering Center Extraction Method Based on Stationary Phase Method With Quadratic Patch Models

In this work, based on the previous paper, the scattering center expression is discussed to represent the scattered field of perfect electric conducting (PEC) targets under the quadratic patch subdivision with the stationary phase method (SPM). The scattered field of target discretized by quadratic patches is simulated with the fast physical optics (FPOs) method, which considers the physical mechanism and can adopt large-sized proportional subdivision. The bistatic attributed scattering center (BASC) model is applied to extract the scattering centers of targets. To solve the ill-posed problem and reduce computational time and precision errors while estimating the parameters of BASC, we present a sparse method that combines the orthogonal matching pursuit (OMP) with adaptive differential evolution (JADE). Numerical examples have demonstrated that the proposed method effectively and precisely extracts scattering centers from complex targets within 2-dB reconstruction error, while the number of patches is greatly reduced by 3 or 4 digits at 10 GHz, from 4352028 to 4606 for the glider model especially.