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Numerical Analysis on the Effect of Long-crested Wave to the RCS of Marine Target

장파봉파가 해상표적의 RCS에 미치는 영향에 대한 수치해석

  • Kim, Kook-Hyun (Special Ship Design Team, Hanjin Heavy Industries and Constructions Co. Ltd.) ;
  • Cho, Dae-Seung (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Kim, Jin-Hyeong (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Lee, Jeong-Kwan (Special Ship Design Team, Hanjin Heavy Industries and Constructions Co. Ltd.)
  • 김국현 ((주)한진중공업 특수선설계팀) ;
  • 조대승 (부산대학교 조선해양공학과) ;
  • 김진형 (부산대학교 조선해양공학과) ;
  • 이정관 ((주)한진중공업 특수선설계팀)
  • Published : 2006.06.20

Abstract

RCS effects of long-crested wave surfaces to marine targets are numerically analyzed using a 4-path model and a direct analysis method, developed based on physical optics and a combined method of physical optics/geometric optics, respectively. Reflectivity of long-crested wave surfaces is described with 'Fresnel reflection coefficients' The MPM(modified Pierson-Moskowitz) ocean spectrum is adopted to simulate long-crested waves in the direct analysis method. A numerical analysis of a benchmark model assures the validity of both methods. The direct analysis method is applied to the RCS calculation of electromagnetically large marine targets, which are vertically oriented or slanted to the long crested wave surfaces randomly generated with various significant wave heights. The long-crested wave surface much highly increases the RCS of the marine target, but those effects are decreased as the significant wave height grows up. At low elevation angle, the vertical model has entirely high RCS comparing slanted model, and the RCS of vertical flat plate is the highest on the calm sea surface, while those of slanted flat plates are the lowest on the calm sea surface. The RCS of marine targets on continuously-varying sea surface is more coherent at lower elevation angles, as well.

Keywords

References

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