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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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An Analysis of Radio Frequency Interferences in L-Band SAR Images

L-대역 SAR 영상에서의 간섭 신호 영향 분석

  • Lee, Seul-Ki (Department of Electronic Engineering and Avionics, Korea Aerospace University) ;
  • Lee, Woo-Kyung (Department of Electronic Engineering and Avionics, Korea Aerospace University) ;
  • Lee, Jae-Wook (Department of Electronic Engineering and Avionics, Korea Aerospace University)
  • 이슬기 (한국항공대학교 항공전자공학과) ;
  • 이우경 (한국항공대학교 항공전자공학과) ;
  • 이재욱 (한국항공대학교 항공전자공학과)
  • Received : 2012.09.25
  • Accepted : 2012.12.03
  • Published : 2012.12.31
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Abstract

SAR(Synthetic Aperture Radar) systems can provide images of wide coverage in day, night, and all-weather conditions. However wideband SAR systems are known to be vulnerable to interferences from other devices operating at in-band or adjacent spectrums and this may lead to image corruptions. In this paper, a SAR point target simulator is developed that provides performance analysis on image distortion caused by interferences from other devices. Interference signals are generated based on the experimental data observed from acquired SAR raw data. Simulation results include typical SAR performance measures such as spatial resolution, peak to sidelobe ratio and integrated sidelobe ratio. Finally, SAR target simulations are performed and shown to correspond to the image corruptions found in real SAR missions affected by RF interferences.

SAR(Synthetic Aperture Radar) 시스템은 주/야간 상황 및 기상환경에 영향을 받지 않고 넓은 지역의 영상 정보를 얻을 수 있는 장점이 있으나, 인접 대역을 사용하는 통신 및 전자기기와의 간섭에 의한 영상 왜곡에 취약한 단점이 있다. 본 논문에서는 SAR 점표적 시뮬레이터를 개발하여 인접 대역에서 수신된 간섭 신호에 의한 영상의 왜곡 현상을 분석한다. 모의실험은 협대역 및 광대역 간섭 신호에 따라 나타나는 간섭 신호의 형태를 표현하고, 점표적 분석 기법인 응답폭, 최대 부엽 레벨 그리고 누적 부엽 레벨을 분석하여 영상 품질 평가를 수행한다. 마지막으로, 본 논문에서 제시한 모의실험 결과가 실제 SAR 위성영상에서 보여지는 간섭 현상과 일치함을 보인다.

Keywords

References

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