Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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A Hybrid RCS Analysis Code Based on Physical Optics and Geometrical Optics

PO-GO 연계기법을 이용한 RCS 해석코드 개발

  • Jang, Min-Uk (Department of Aerospace and System Engineering and Research Center for Aircraft Parts Technology, Gyeongsang National University) ;
  • Myong, Rho-Shin (Department of Aerospace and System Engineering and Research Center for Aircraft Parts Technology, Gyeongsang National University) ;
  • Jang, In-Mo (Korea Aerospace Industries, Ltd.) ;
  • Lee, Dong-Ho (Korea Aerospace Industries, Ltd.)
  • Received : 2014.08.06
  • Accepted : 2014.10.23
  • Published : 2014.11.01
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Abstract

A hybrid method based on high-frequency asymptotic optics was developed in order to predict the RCS of flying vehicles for RCS reduction studies. In cavity return, the rays are assumed to bounce from the inlet cavity based on the laws of geometrical optics and to exit the cavity via the aperture. In other parts of a flying vehicle, the physical optics method is applied to compute the back-scattered field from the solid surface. The hybrid method was validated by considering simple models of sphere and sphere with cavity. In addition, RCS analysis of a flying vehicle was conducted using the new hybrid electromagnetic scattering method based on physical optics and geometrical optics theories.

효율적인 RCS 감소 연구를 위해 고주파수 근사 기법을 연계한 혼합기법 기반의 RCS 예측 코드를 개발하였다. 연계기법으로 전자기파 산란에 관한 고주파 기법인 물리광학법(Physical Optics)과 기하광학법(Geometrical Optics)을 이용하였다. RCS 산란 메커니즘의 하나인 Cavity Return 효과를 확인하기 위해 Inlet 영역은 기하광학법을 적용하였고, 그 외 영역은 물리광학법을 적용하였다. 예측코드의 정확성을 검증하기 위하여 구의 이론해와 예측결과를 비교하였고, Cavity가 존재하는 Sphere에 대한 Full Wave 해석해와 결과값을 비교하였다. 마지막으로 비행체 형상에 대한 RCS 해석문제에 적용하여 개발 코드의 유용성을 확인하였다.

Keywords

References

  1. Ball, R. E., The Fundamentals of Aircraft Combat Survivability Analysis and Design, AIAA Education Series, 2nd Edition, 2003.
  2. Knott, E. F., Shaeffer, J. F. and Tuley, M. T., Radar Cross Section, Second Edition, Artech House, 1993.
  3. Myong, R. S., Aircraft Survivability and Stealth Technology, Lecture Note, Gyeongsang National University, 2013.
  4. Jenn, D. C., Radar and Laser Cross Section Engineering, AIAA Education Series, 2005.
  5. Choi, S. W. and Boo, S. Y., "Computation of Radar Cross Section of Ship's Structure using a Physical Optics Method," Journal of the Society of Naval Architects of Korea, Vol. 37, No. 4, 2006, pp. 82-916.
  6. Lee, D. H., "A Study on the CEM Code for RCS Prediction of Flying Vehicle Based on FVTD Method," M. S. Thesis, Gyeongsang National University, 2009.
  7. Choi, N. S., "An Analysis of Helicopter Radar Cross Section Using Physical Optics Method," M. S. Thesis, Gyeongsang National University, 2008.
  8. Myong, R. S. and Cho, T. H., "Development of a Computational Electromagnetics Code for Radar Cross Section Calculations of Flying Vehicles," Journal of Korean Society for Aeronautical and Space Sciences, Vol. 33, No. 4, 2005, pp. 1-6. https://doi.org/10.5139/JKSAS.2005.33.4.001
  9. Ozgun, S., "Computation of Radar Cross Sections of Complex Targets by Shooting Bouncing Ray Method," M. S. Thesis, Middle East Technical University, 2009.
  10. Ling, H., Chou, R. and Lee, S. W., "Shooting and Bouncing Rays: Calculating the RCS of an Arbitrarily Shaped Cavity," IEEE Transactions on Antennas and Propagation, Vol. 37, No. 2, 1989, pp. 194-205. https://doi.org/10.1109/8.18706
  11. Ling, H., Chou, R. and Lee, S. W., "High-Frequency RCS of Open Cavities with Rectangular and Circular Cross Sections," IEEE Transactions on Antennas and Propagation, Vol. 37, No. 5. 1989, pp. 648-655. https://doi.org/10.1109/8.24193
  12. Mahafza, B. R. and Elsherbeni, A. Z., MATLAB Simulations for Radar Systems Design, Chapman & Hall/CRC, 2004.
  13. Chatzigeorgiadis, F., "Development of Code for a Physical Optics Radar Cross Section Prediction and Analysis Application," M. S. Thesis, Naval Postgraduate School, 2004.
  14. Garrido, E. E., "Graphical User Interface for a Physical Optics Radar Cross Section Prediction Code," M. S. Thesis, Naval Postgraduate School, 2000.
  15. RadBase User's Guide Version 2.0, 2000.