Abstract
This paper presents a numerical investigation of electromagnetic scattering from ship-generated internal wave wake and its underlying two-dimensional sea surfaces. The geometric modeling of internal wave wake and linear sea surfaces as well as nonlinear choppy wave model (CWM) sea surfaces are performed successively. Then, the normalized radar cross-section (NRCS) calculations are carried out using second-order small-slope approximation (SSA-2) in bistatic and monostatic configurations. To study the scattering characteristics of internal wave wakes that usually have a large coverage area, the calculations are performed in four successive regions. The results reflect that the scattering signals of four regions are distinguished from those of sea surface without wake; furthermore, the NRCSs for CWM sea surfaces with internal wave wakes are both larger than those of the linear sea surfaces with internal wave wakes in bistatic and monostatic configurations.
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