Study of electromagnetic composite scattering from a ship-generated internal wave wake and its underlying sea surface. (English) Zbl 1397.76020
Summary: 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.
MSC:
| 76B20 | Ship waves |
| 74F20 | Mixture effects in solid mechanics |
| 74F10 | Fluid-solid interactions (including aero- and hydro-elasticity, porosity, etc.) |
| 74F15 | Electromagnetic effects in solid mechanics |
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