Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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Study on the Extraction of Ocean Wind, Wave and Current using SAR

SAR를 이용한 해풍, 파랑, 해류 추출 기법 연구

  • 강문경 (강원대학교 지구물리학과) ;
  • 박용욱 (강원대학교 지구물리학과) ;
  • 이문진 (한국해양연구원 해양시스템안전연구소) ;
  • 이훈열 (강원대학교 지구물리학과)
  • Published : 2007.02.28
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Abstract

Recently satellite SAR techniques have become essential observation tools for various ocean phenomena such as wind, wave, and current. The CMOD4 and CMOD-IFR2 models are used to calculate the magnitude of wind at SAR resolution with no directional information. Combination of the wave-SAR spectrum analysis and the inter-look cross-spectra techniques provides amplitude and direction of the ocean wave over a square-km sized imagette, The Doppler shift measurement of SAR image yields surface speed of the ocean current along the radar looking direction, again at imagette resolution. In this paper we report the development of a SAR Ocean processor(SOP) incorporating all of these techniques. We have applied the SOP to several RADARSAT-1 images of the coast of Korean peninsula and compared the results with oceanographic data, which showed reliability of spaceborne SAR-based oceanographic research.

최근 인공위성 SAR를 이용한 기술은 해풍, 파랑, 해류 등과 같은 해양에서 발생되는 다양한 현상을 관측하고 연구하는데 필수적인 기술로 대두되고 있다. CMOD4, CMOD-IFR2 모델은 해상풍의 크기를 구할 수 있으며, wave-SAR 변환 기법과 inter-look cross-spectra 기법은 파랑의 크기, 방향과 같은 물리적 값을 추출할 수 있다. 또한 Doppler shift 기법을 적용하여 해류속도를 구할 수 있다. 본 연구에서는 위의 기법들을 종합적으로 적용하여 SOP(SAR Ocean Processor) 프로세서를 개발하였다. 이 프로세서를 한반도 연안 지역에 적용하여 RADARSAT-1 영상자료로부터 해풍, 파랑, 해류의 물리적 정보를 추출하였으며, 이를 현장 관련 자료와 비교하여 신뢰할만한 결과를 얻을 수 있었다.

Keywords

References

  1. 김덕진(2001), "인공위성 SAR 자료를 이용한 해상풍 벡터추출", 석사학위논문, 서울대학교.
  2. 김덕진(2005), "SAR를 이용한 해양의 해상풍, 해류, 파랑 및 내부파의 정량적 원격탐사", 박사학위논문, 서울대학교.
  3. 양찬수(2006), "SAR에 의한 파랑 방향 스펙트럼 추정에 관한 연구", 2006 춘계학술대회 논문집, 대한원격타사학회, pp. 71-74.
  4. Alpers, W. R. and Rufenach, C. L. (1979), "The Effeci Orbital Motions on Synthetic Aperture Radar Imagery Ocean Waves", IEEE Transaction on Antennas Propagation, Vol. AP-27, No.5, pp. 685-690.
  5. Alpers, W. R., Ross, D. B. and Rufenach, C. L. (1981), "On the Detect Ability of Ocean Surface Waves by Real and Synthetic Aperture Radar", Journal of Ceophys Research, Vol. 86, No. C7, pp. 6481-6498. https://doi.org/10.1029/JC086iC07p06481
  6. Bao, M. and Alpers, W. (1998), "On the Cross Spectrum Between Individual-Look Synthetic Aperture Rs Images of Ocean Waves", IEEE Transactions Geoscience and Remote Sensing, Vol. 36, No.3, 922-932. https://doi.org/10.1109/36.673683
  7. Bruning, C., Alpers, W. R., and Schroeter, J. G. (1991), "On the Focusing Issue of Synthetic Aperture Radar Imaging of Ocean Waves", IEEE Transaction Geoscience and Remote Sensing, Vol. GE-29, No.1, 120-128.
  8. Chapron, B., Collard, F., and Ardhuin, F. (2005), "Direct Measurements of Ocean Surface Velocity from Space: Interpretation and Validation", J. of Geophysical Research, Vol. 110, pp. 1-17.
  9. Curlander, J. C. and McDonough, R. M. (1991), "Synthetic Aperture Radar Systems and Signal Processing", John Wiley & Sons, Inc., New York.
  10. Dowd, M., Vachon, P. W., Dobson, F. W., and Olsen R. B. (2001), "Ocean Wave Extraction from RADARSAT Synthetic Aperture Radar Inter-Look Image Cross-Spectra", IEEE Transaction on Geoscience and Remote Sensing, Vol 39, No.1, pp. 21-37. https://doi.org/10.1109/36.898662
  11. Elachi, C. (1988), "Spaceborne Radar Remote Sensing: Applications and Techniques", IEEE Press, New York.
  12. Elachi, C. and Brown, W. E. (1977), "Models of Radar Imaging of the Ocean Surface Waves", IEEE Transaction on Antennas and Propagation, Vol. AP- 25, No.1, pp. 84-94.
  13. Engen, G. and Johnsen, H. (1995), "SAR-Ocean Wave Inversion Using Image Cross Spectra", IEEE Transaction on Antennas and Propagation, Vol. 33, No. 4, pp. 1047-1056.
  14. Farquharson, G., Junek, W. N., Ramanathan, A, Frasier, S. J, Tessier, R, McLaughlin, D. J. Sletten, M. A., and Toporkov, J. V. (2004), "A Pod-Based Dual-Beam SAR", IEEE Geoscience and Remote Sensing Letters, Vol. 1, No. 2, pp. 62-65. https://doi.org/10.1109/LGRS.2004.826553
  15. Frasier, S. J. and Camps, A. J. (2001), "Dual-Beam Interferometry for Ocean Surface Current Vector Mapping", IEEE Transaction on Geoscience and Remote Sensing, Vol. 39, No. 2, pp. 401-414. https://doi.org/10.1109/36.905248
  16. Hasselmann, K. and Hasselmann, S. (1991), "On the Nonlinear Mapping of an Ocean Wave Spectrum into a Synthetic Aperture Radar Imang Spectrum and Its Inversion", J. Geophysical Research, Vol. 96, pp. 10713-10729. https://doi.org/10.1029/91JC00302
  17. Hasselmann, S., Bruning, C, Hasselmann K. and Heimbach P. (1996), "An Improved Algorithm for the Retrieval of Ocean Wave Spectra from Synthetic Aperture Radar Image Spectra", J. of Geophysical Research, Vol. 101, No. C7, pp. 16615-16629. https://doi.org/10.1029/96JC00798
  18. Horstmann, J., Koch, W., Lehner, S., and Tonboe, R. (2000), "Wind Retrieval over the Ocean using Synthetic Aperture Radar with C-band HH Polarization", IEEE Transactions on Geoscience and Remote Sensing, Vol. 38, No.5, pp. 2122-2131. https://doi.org/10.1109/36.868871
  19. IFREMER-CERSAT (1999), "Off-Line Wind Scatterometer ERS Products: User Manual, Technical Report C2-MUT-W-01-IF", IFREMER-CERSAT.
  20. Ivanov, A. V. (1982), "On the Synthetic Aperture Radar Imaging of Ocean Surface Waves", IEEE Journal of Oceanic Engineering, Vol. OE-7, No.2, pp. 96-103.
  21. Jain, A. (1981), "SAR Imaging of Ocean Waves: Theory", IEEE Journal of Oceanic Engineering, Vol. OE-6, No.4, pp. 130-139.
  22. Moore, R. K. (1985), "Radar Sensing of the Ocean", IEEE Journal of Oceanic Engineering, Vol. OE-10, No.2, pp. 84-113.
  23. Mouchot, M. C., and Garello, R. (1998), "SAR for Oceanography" in Henderson, F. M. and Lewis, A. J., Ed., Principles & Application of Imaging Radar, John Wiley & Sons, New York.
  24. Raney, R. K. (1980), "SAR Response to Partially Coherent Phenomena", IEEE Transaction on Antennas and Propagation, Vol. AP-28, No.6, pp. 777-787.
  25. Raney, R. K. (1981), "Wave Orbital Velocity, Fade and SAR Response to Azimuth Waves", Journal of Oceanic Engineering, Vol. OE-6, No.4, pp. 140-146.
  26. Stoffelen, A and Anderson, D. (1997a), "Scatterometer Data Interpretation: Estimation and Validation of the Transfer Function CMOD4", J. of Geophysical Research, Vol. 102, No. C3, pp. 5767-5700. https://doi.org/10.1029/96JC02860
  27. Stoffelen, A. and Anderson, D. (1997b), "Scatterometer Data Interpretation: Measurement Space and Inversion", J. of Atmospheric and Oceanic Technology, Vol. 14, pp. 1298-1313 https://doi.org/10.1175/1520-0426(1997)014<1298:SDIMSA>2.0.CO;2
  28. Swift, C. T. and Wilson, L. R. (1979), "Synthetic Aperture Radar Imaging of Moving Ocean Waves", IEEE Transaction on Antennas and Propagation, Vol. AP-27, No.6, pp. 725-729.
  29. Tomiyasu, K. (1978), "Tutorial Review of Synthetic Aperture radar (SAR) with Applications to Imaging of the Ocean Surface", Proceedings of IEEE, Vol. 66, No.5, pp. 563-583. https://doi.org/10.1109/PROC.1978.10961
  30. Toporkov, J. V., Perkovic, D., Farquharson, G., Sletten, M., and Frasier, S. J. (2005), "Sea Surface Velocity Vector Retrieval Using Dual-Beam Interferometry: First Demonstration", IEEE Transaction on Geoscience and Remote Sensing, Vol. 41, No. 11, pp. 2494-2502.

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