Abstract
Hybrid scheme combining shooting and bouncing ray with semi-deterministic facet model is proposed to analyze composite scattering from ship-ocean scene in this study. This model can deal with complex electromagnetic interaction between ship and sea surface. Thus, scattering properties of composite ship-ocean scenes with influence of various parameters (such as incident angle and wind speed) can be studied and analyzed efficiently. Studying such properties is of significance for target detection and high-resolution radar imaging in sea environments. Accuracy and performance of this method are validated and evaluated by comparing with multilevel fast multipole method of FEKO for electrically small objects. All simulation results indicate that the proposed method is suitable for providing preliminary radar cross section prediction of electrically large composite model.
Highlights
Electromagnetic scattering of electrically large targets above rough sea surface is common military scene in target detection and tracking [1,2,3]
Method of Moment (MoM) [4] is widely used numerical algorithm, which is adequately developed into fast algorithms, such as Generalized Forward-Backward Method (GFBM) [5, 6] and multilevel fast multipole algorithm (MLFMA) [7, 8]
This paper aims to establish feasible scheme that conforms to sea surface two-scale model by combining SDFM and Shooting and Bouncing Ray (SBR) method
Summary
Electromagnetic scattering of electrically large targets above rough sea surface is common military scene in target detection and tracking [1,2,3]. Method of Moment (MoM) [4] is widely used numerical algorithm, which is adequately developed into fast algorithms, such as Generalized Forward-Backward Method (GFBM) [5, 6] and multilevel fast multipole algorithm (MLFMA) [7, 8] Such methods require considerable computational time when dealing with electrically large targets. For large-scope sea surfaces, semi-deterministic facet scattering model (SDFM) [13, 14] was developed in relevant publications In this model, elementary radar echoes from respective facets are computed by a semideterministic scheme considering both specular and diffuse configurations. With SDFM considering Bragg scattering from capillary waves, sea surface can be meshed into larger triangle patches, which adapt well to SBR method for ray tracing between the ship and ocean. Hybrid SBR-SDFM method should be time-saving and highly efficient to handle radar cross section calculation of electrically large ship-ocean composite model
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