AN EFFICIENT HYBRID HIGH-FREQUENCY SOLUTION FOR THE COMPOSITE SCATTERING OF THE SHIP ON VERY LARGE TWO-DIMENSIONAL SEA SURFACE

Abstract

A hybrid high-frequency solution is proposed to analyze the bistatic electromagnetic scattering of the ship target on very large two-dimensional randomly rough sea surface in this paper. The comprehensive geometrical model of the ship and sea surface is designed by CAD tools and the sea power spectrum, and its electromagnetic scattering characteristic is evaluated with the method of equivalent currents (MEC). Since the electromagnetic interaction between the ship hull and the sea surface in the vicinity of the broadside is similar to the scattering mechanism of the dihedral re∞ector, the iterative physical optics method (IPO) is utilized to study the electromagnetic coupling efiects. The shadowing correction based on the Z-Bufier technology is introduced to eliminate the efiects of the irrelevant scattering resources. At last, the validity of the hybrid method is conflrmed by the SAR image of the ship on the very large two-dimensional sea surface, and the numerical results are presented to analyze the composite scattering characteristics of the ship on the sea surface.