Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Theoretical Analysis of the Lock-on Range of a Man-portable Air Defense System Under Foggy Conditions with the Radiative-transfer Equation

복사전달방정식을 활용한 안개 조건에서의 휴대용 대공 유도미사일 Lock-on range에 대한 이론적 분석

  • Seok, In Cheol (Nano Photonics Laboratory, School of Mechanical Engineering, Yonsei University) ;
  • Lee, Chang Min (Nano Photonics Laboratory, School of Mechanical Engineering, Yonsei University) ;
  • Hahn, Jae W. (Nano Photonics Laboratory, School of Mechanical Engineering, Yonsei University)
  • 석인철 (연세대학교 기계공학과, 나노광자공학 연구실) ;
  • 이창민 (연세대학교 기계공학과, 나노광자공학 연구실) ;
  • 한재원 (연세대학교 기계공학과, 나노광자공학 연구실)
  • Received : 2018.11.12
  • Accepted : 2019.01.14
  • Published : 2019.02.25
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Abstract

MANPADS (man-portable air defense system) is a counterweapon system against enemy aircraft, tracking the MWIR (mid-wavelength of infrared) signature of the plume. Under foggy conditions, however, multiple scattering phenomenon caused by the particles affects the MWIR transmittance, and the MANPADS detection performance. Therefore, in this study we analyzed the lock-on range of MANPADS with varying fog conditions and plume characteristics. To analyze the optical extinction properties and transmittance in fog, Mie scattering theory and analytic solution of the radiative-transfer equation are utilized. In addition, we used flare signature as an alternative MWIR light source. We confirmed that the lock-on range could be noticeably reduced under conditions of mist, and proportional to the flare temperature.

휴대용 대공유도 미사일(Man-Portable Air Defense System)은 플룸의 중적외선 신호를 추적하는 적 항공기의 대응무기체계이다. 안개 조건에서 입자들에 의한 다중 산란현상은 중적외선 파장에서의 투과율과 휴대용 대공유도 미사일 탐지성능에 영향을 준다. 그러므로 본 연구에서 다양한 안개조건과 플룸의 특성에 따른 휴대용 대공유도 미사일의 lock-on range를 분석한다. 안개 조건에서의 광학적 소멸특성과 투과율을 분석하기 위해 미산란(Mie scattering) 이론과 복사전달방정식의 분석적 해를 활용하였다. 뿐만 아니라 중적외선 대체광원으로서 섬광탄 화염 신호를 운용했다. 다양한 시정 및 화염 온도조건에서 분석된 lock-on range는 mist 조건에서 크게 감소하며, 화염 온도가 높아질수록 증가하는 것으로 확인하였다.

Keywords

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Fig. 1. Schematic of the entire set of geometrical parameters for the calculation of the RTE solution.

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Fig. 2. Calculated spectral radiant exitance of MWIR flare with varying temperature between 500 and 600 K.

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Fig. 3. Comparison of the calculated contrast spectrum obtained from BLL (dash line) and analytic solution (solid line) at 600 K in the fog. Visibility is 1 km and path length is 1 km.

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Fig. 4. Comparison of the calculated lock-on range with varying visibility and temperature. Flare temperatures are 500 K, 550 K, and 600 K.

Table 1. Classification of fog[15]

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Table 2. Particle radius with varying visibility[18-20]

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