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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Multiple Noise OFDM Waveforms for Wide Swath MIMO SAR

광역 MIMO SAR 영상 획득을 위한 다중 잡음 OFDM 파형 활용 연구

  • 문민정 (한국항공대학교 항공전자공학과) ;
  • 송경민 (한국항공대학교 항공전자공학과) ;
  • 이우경 (한국항공대학교 항공전자공학과) ;
  • 유상범 (한국항공우주연구원) ;
  • 이현철 (한국항공우주연구원) ;
  • 이상규 (한국항공우주연구원)
  • Received : 2018.03.30
  • Accepted : 2018.05.14
  • Published : 2018.06.30
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Abstract

Future spaceborne satellite synthetic aperture radar(SAR) system is expected to acquire high-resolution images over wide swath areas. Conventional SAR systems suffer from ambiguity problems in both azimuth and range directions that lead to image quality degradation. Recently, multiple input multiple output(MIMO) SAR techniques having multiple orthogonal waveforms are proposed to overcome the conventional ambiguity problems in wide-swath imaging modes. In this paper, noisy orthogonal frequency division multiplex(OFDM) waveforms are developed to reduce the ambiguity problems and suppress the image quality degradation. SAR simulations are performed to evaluate the performance of the proposed technique for wide-swath SAR imaging.

최근 위성 SAR(Synthetic Aperture Radar) 시스템의 개발은 광역 관측을 수행하는 동시에, 고해상도 영상을 확보하는 방향으로 확장되고 있다. 일반적인 위성 SAR 시스템에서는 광역의 고해상도 영상을 획득하는 과정에서 방위 및 거리방향의 모호성 문제가 유발되어 영상 품질의 저하가 발생한다. 다중 입출력 장치를 사용하는 MIMO(Multiple Input Multiple Output) SAR 기술은 상호 상관성이 낮은 파형군을 적용하여 관측폭을 확장하면서도 영상 품질을 유지하는 기법으로 제안되고 있다. 본 논문에서는 상호 직교 특성을 갖는 다중 잡음 OFDM(Orthogonal Frequency Division Multiplex) 파형을 설계하고, 다중 파형 모드에서의 영상 품질 분석을 수행하여 광역 고해상도 SAR 모드에 적용 가능성을 제시한다.

Keywords

References

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