Radar Scattering From the Composite Ship-Ocean Scene: Facet-Based Asymptotical Model and Specular Reflection Weighted Model

The principal purpose of this work is to describe the theoretical implementation aspects of the prediction of radar returns from the composite object-ocean scene. This communication firstly presents a facet-based asymptotical model (FBAM) to give a complex reflective function of the scattering field from the sea surface using the Euler's formula and the expansion of a plane wave in terms of Bessel functions, which could facilitate the computation for the composite scene through the superposition of the scattering field of each contribution and make preparations for the postprocessing simulation such as Doppler spectrum analysis. In the interest of analyzing the coupling scattering field between the object and sea surface, a weighted approach is proposed to modified the four-path model when the under surface includes non-negligible roughness. Due to its good tractability and small calculating quantity, the entire simulator might be superior to some available models and enables us to provide a preliminary prediction on the radar cross sections (RCS) mean levels for electrically large object-sea model.