Fast General Polarimetric Model-Based Decomposition

Abstract

The scattering mechanism interpretation of oriented manmade targets especially those with large orientation angles is a challenging task. Recently, to fit the cross-polarization and off-diagonal terms, physically meaningful double-bounce and odd-bounce scattering models have been developed by modeling their independent orientation angles. Nevertheless, parameters inversion of these models is a nonlinear optimization procedure. The main purpose of this work is to convert the nonlinear model inversion procedure to a linear solution while inheriting the generalized models. By disclosing the latent relationship between the polarization orientation angle and double-bounce orientation angle, a double-bounce orientation angle inversion method is developed. Then a refined double-bounce scattering model is proposed and a fast general model-based decomposition is established. The comparison experiments are performed on PiSAR data. Compared with the state of art approaches, the proposed decomposition method achieved improved decomposition performance from both visual and quantitative investigation for oriented built-up areas.