Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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Laser-based Jamming of a Pulse Modulated Infrared Seeker

레이저빔을 이용한 펄스변조 적외선탐색기 기만

  • Kim, Sungjae (The 3rd Research and Development Institute, Agency for Defense Development) ;
  • Jeong, Chunsik (The 3rd Research and Development Institute, Agency for Defense Development) ;
  • Shin, Yongsan (The 3rd Research and Development Institute, Agency for Defense Development)
  • 김성재 (국방과학연구소 제3기술연구본부) ;
  • 정춘식 (국방과학연구소 제3기술연구본부) ;
  • 신용산 (국방과학연구소 제3기술연구본부)
  • Received : 2018.09.19
  • Accepted : 2019.03.22
  • Published : 2019.04.05
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Abstract

Laser beam is directional and small in divergence angle so that it is well qualified to deliver high intensity infrared energy into a coming MANPADS threat for aircraft survivability. The threat will be deceived and loose tracking of a target when it is exposed to the laser beam modulated relevant to the track mechanism of the threat. The laser beam goes through scattering inside the seeker of the threat and reach the detector in a stray light form, which is a critical phenomenon enabling jamming of the seeker. The mechanism of the laser beam based jamming against a pulse modulated infrared seeker is shown. Simulations are carried out to support the understanding of how the jam technique works.

Keywords

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Fig. 1. Schematic of optics(left) and reticle(right) of a pulse modulated infrared seeker

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Fig. 2. Schematic of a target on the rotating reticle

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Fig. 3. Target signal generated from the model

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Fig. 4. Block diagram of a pulse modulated infrared seeker model

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Fig. 5. Coordinate system used in the simulation

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Fig. 6. Track error simulation for a static target

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Fig. 7. Track error simulation for a dynamic target

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Fig. 8. Beam spot model for an optical system with ideal surface roughness

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Fig. 9. Beam spot model for an optical system with practical surface roughness

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Fig. 10. Beam spot distribution prediction due to scattering for different surface roughnesses

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Fig. 11. Notion of how a target signal and a laser signal are acquired as the reticle phase varies

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Fig. 12. Notion of how a target signal and a laser signal are acquired as error angle varies

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Fig. 13. 3D power distribution of laser beam received on the detector through the slit as the reticle rotates and the laser beam moves along the +y axis

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Fig. 14. JSRd prediction for different scattering models as the laser beam moves along the +y axis and the reticle phase remains at 180 deg

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Fig. 15. Signal received for lower scattering case during the initial moment of jamming

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Fig. 16. Error angle variation for lower scattering case during the initial moment of jamming

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Fig. 17. Signal received for higher scattering case during the initial moment of jamming

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Fig. 18. Error angle variation for higher scattering case during the initial moment of jamming

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