Abstract
The composite scattering of ship-generated waves is investigated for Doppler spectrum analysis of ship on sea surface. The complex scattering of three dimensional electrically large ship on sea surface is modeled based on the four path method. The interaction of ship and sea surface is analyzed with the hydrodynamic theory, which leads to the reasonable geometric model of ship-generated waves. The coherent scattering field of nonlinear sea surface is calculated with modified two scale method, and the equivalent electromagnetic currents are used for the evaluation of polarization scattering from three dimensional ship model. The influence of dielectric sea water on scattering intensity is included with modified reflection coefficient. It is found that the backscattering feature is apparently related with the ship hull, ship speed and sea state. The Doppler spectrum model is established based on the simulated composite backscattering fields, which indicates the relationship between the scattering feature and ship-generated waves. Due to the volume scattering, the composite scattering at large incidence angles is strongly enhanced by the non-Bragg scattering, which weakens the polarization characteristic of composite scattering. The relationship of the full composite scattering model with the sea state is examined, which provides theoretical basis for the radar imaging technologies.
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