Computation of Electromagnetic Scattering from Ice-Sea Rough Surface via FDTD

Finite difference time domain (FDTD) method is used to calculate the electromagnetic scattering for sea rough surface with ice. The sea rough surface and ice rough surface model is established by Monte Carlo method, while the dielectric constants of seawater and sea ice by Debye model. Then Scattering from sea-ice thickness and temperature are analyzed. The numerical results show that different ice thicknesses had little effect on the Radar Cross Section (RCS); different sea ice temperatures have an effect on the RCS, and the RCS increases with the decrease of sea ice temperature. The effects of seawater and sea ice on the target RCS are also analyzed, and the numerical results show that the sea surface and ice surface generate clutter, which leads to the reduction of the RCS.