The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Analysis of Microwave Inverse Scattering Using the Broadband Electromagnetic Waves

광대역 전자파를 이용한 역산란 해석 연구

  • Lee Jung-Hoon (Department of Communication Engineering, MyongJi University) ;
  • Chung Young-Seek (Department of Communication Engineering, MyongJi University) ;
  • So Joon-Ho (TRC 2nd Division, Agency for Defense Development) ;
  • Kim Junyeon (TRC 2nd Division, Agency for Defense Development) ;
  • Jang Won (TRC 2nd Division, Agency for Defense Development)
  • 이정훈 (명지대학교 통신공학과) ;
  • 정용식 (명지대학교 통신공학과) ;
  • 소준호 (국방과학연구소 기술본부) ;
  • 김준연 (국방과학연구소 기술본부) ;
  • 장원 (국방과학연구소 기술본부)
  • Published : 2006.02.01
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Abstract

In this paper, we proposed a new algorithm of the inverse scattering for the reconstruction of unknown dielectric scatterers using the finite-difference time-domain method and the design sensitivity analysis. We introduced the design sensitivity analysis based on the gradient information for the fast convergence of the reconstruction. By introducing the adjoint variable method for the efficient calculation, we derived the adjoint variable equation. As an optimal algorithm, we used the steepest descent method and reconstructed the dielectric targets using the iterative estimation. To verify our algorithm, we will show the numerical examples for the two-dimensional $TM^2$ cases.

본 논문에서는 시간 영역 유한차분법(FDTD: Finite-Difference Time-Domain Method)과 설계 민감도법(design sensitivity analysis)을 이용하여 미지의 유전체 산란체(dielectric scatterer) 복원을 위한 역산란 문제(inverse scattering)의 새로운 해석 기법을 제안하였다. 본 연구에서는 빠른 수렴을 위하여 목적 함수의 도함수를 이용한 설계 민감도법을 도입하였고, 시간 영역 유한차분법으로부터 직접 설계 민감도 수식을 도출하였다. 해석의 효율성을 위하여 보조 변수법(adjoint variable method)을 도입하여 보조 변수 방정식을 도출하고 최적화 알고리듬으로 최대 경사도법을 이용하여 반복적인 추정을 통하여 미지의 유전체를 복원하였다. 본 연구의 타당성의 보이기 위하여 2차원 $TM^z$에서의 유전체 복원 사례를 제시한다.

Keywords

References

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