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1 韓國電磁波學會誌 電磁波技術 第 22 卷第 6 號 2011 年 11 月 SAR 영상의활용 Abstract Asia-Pacific International Conference on Synthetic Aperture Radar(APSAR) 2011 SAR. SAR,,,,. SAR. SAR, SAR. Keyword: SAR,,,,,. 서론 (imaging radar) 20 [1]. [2]. Synthetic Aperture Radar(SAR), [3] Seasat-A SAR ERS-1, 2, Envisat, JERS-1, ALOS PALSAR, Radarsat-1, 2, Terra SAR-X, TanDEM-X, COSMO-SkyMED SAR, [4],[5]. SAR (radargrammetry) [6], (interferometry) (differential interferometry) [7],[8], (permanent scatterer interferometry) [9], (polarimetry) [10], (tomography) [11], Along-Track Interferometry(ATI) [12], SAR,. SAR. SAR,,, [13],[14],.. 육상활용분야,,,,,,,,,,,. 55

2 SAR 2-1 농업 SAR,.,,,,.,.,. ([ 1]).,. L-,. X 고고학 / 지하구조 (GPR) MHz MHz. SAR GHz... ([ 2]). 2-3 지형측량 SAR, radargrammetry, radarclinometry, SAR DEM. Radargrammetry, (coherence). [ 그림 1] Difference of filled water fields and non-filled water fields [15] [ 그림 2] Experimental results of land mine detection from AMUSAR [16] 56

3 韓國電磁波學會誌第 22 卷第 6 號 2011 年 11 月 SAR.,. Radarclinometry. SAR,,.,,., SAR SAR DEM ([ 3]).,., (coherence), X-band C-band, L-band 1 2 km DEM. SAR,. SRTM TanDEM-X DEM SRTM , Terra SAR-X TanDEM-X DEM 1 m. SAR DEM LIDAR DEM. 2-4 산림학 (a) ALOS-PALSAR (b) Radarsat-2 (c) SRTM mission [ 그림 3] Digital elevation models from in SAR [17], SAR polarimetry tomography.. X-band, L-band.,, SAR polarimetry. L- 57

4 SAR. SAR SAR. SAR Tomography. SAR Tomography SAR range, azimuth.,,,, ([ 4]). 2-5 지질학 SAR. SAR,. SAR. [ 그림 4] Single-look tomogram of forest [18],, SAR SAR. 2-6 지구조 / 지반변위 SAR (interferogram).,,,,, (differential interferometry)., SAR.,,. DInSAR, (ascending) (descending), 3. inclination, inclination SAR 58

5 韓國電磁波學會誌第 22 卷第 6 號 2011 年 11 月,.. GPS,, SAR., % 2π. MODIS SAR,. SAR,, PSInSAR (Permanent Scatterer InSAR) SBAS(Small Baseline Subset) ([ 5]) 호소학및수문학 SAR,., [ 그림 5] LOS mean velocity map generated from PSIn SAR [19]. SWE(snow water equivalent). 2-8 지진학 (pre-seismic), (co-seismic) (post-seismic). DInSAR ([ 6])... 59

6 SAR,. 2-9 토양학.. SAR. L-. ([ 7]) 화산학, SAR. DInSAR /, SAR. (a) HH/VV July (b) HH/HV August 7, 2005 [ 그림 7] Soil moisture maps of Mumbai test site [21] 2-11 도시학 SAR.,,, SAR. 1 SAR InSAR DEM, ([ 8]) 주제도 SAR,. /, (coherence map) (a) ascending orbit (b) azimuth offset (c) descending orbit ([ 9]). [ 그림 6] Co-seismic interferograms for the SE Iran earthquake (Mw6.3, December 20, 2010) from ALOS- PALSAR [20]. 해양활용분야 70 % 60

7 韓國電磁波學會誌 第22卷 第6號 2011年 11月 와 같은 인공위성 산란계(scatterometer)를 이 용하여 풍속과 풍향을 추출해 왔으나, 그 해상도가 수십 km에 달하기 때문에 고해상도인 SAR를 이용한 해풍 연구가 활발히 진행 중에 있다. SAR를 이용한 풍 향의 결정은 바람에 의한 물결의 방향(wind streak)이 확실할 경우 영상에서 추출할 수 있지만, 그렇지 못 할 경우 기상 정보나 산란계 자료와 같은 외부 정보 가 필요하다([그림 10]). ADEOSII (a) a conventional method (b) a newly developed method [22] [그림 8] Differential interferograms of urban area 을 위하여 SAR의 해양 활용 분야는 매우 다양하다. 연구의 대상에 따라 해풍(wind), 표면파(surface wave), 내부파(internal wave), 해류(current), 해저 지형(bathymetry), 유류/생물막(oil spill/biological film), 선박 탐지, 조간대/연안 분야로 세분될 수 있다. 3-1 해풍 영상은 해수면의 거칠기에 따라서 밝기가 변화하는데, 이용하여 해풍의 풍속과 풍향을 계산하 는 연구가 매우 활발하다. 바다 표면에서 표면장력 파(capillary wave) 혹은 중력파(gravity wave)에 의한 산 란 모델을 통해 SAR 영상의 밝기를 풍속으로 역산 하며, 현재 다양한 마이크로파 파장과 편파에 대한 산란모델이존재한다. 한편, 미국의 NSCAT, QuikSCAT, SAR (a) Four-component scattering power decomposition 3-2 파랑 해수면에서의 파랑은 바람의 크기와 방향 및 지 속 시간, 해저 지형, 해류 및 조류에 따라 성질이 달 라진다. SAR 영상에서 선형적인 파랑 정보를 추출하 기 위해 주로 푸리에 변환을 거쳐 파랑의 주요 스펙 트럼을 추출하고, 이를 통해 파랑의 파장과 진행방향 을 알아낸다([그림 11]). 이 때 파랑의 진향 방향은 180도의 모호성을 지니게 되는데, 이는 SAR 영상화 과정에서 azimuth 스펙트럼 성분을 분할하여 두 개의 영상을 만든 후, 이의 상관성을 보는 inter-look crossspectra 방법을 사용하면 방향을 결정할 수 있다. 3-3 내부파 해양의 SAR 영상에서 간혹 파장이 수 백미터에서 수 킬로미터의 장파가 관찰되는 데, 이는 밀도가 비슷 한 두 해수가 만나서 층을 이루는 경계부에서 에너지 (b) Decomposition (c) Decomposition using rotated using rotated cocoherency matrices variance matrices [그림 9] ALOS-PALSAR decomposition of Tokyo Bay, [23] Japan [24] [그림 10] Wind field estimated from TerraSAR-X 61

8 SAR.,,,.,,. 3-4 해류 SAR. Along-Track Interferometry(ATI), TerraSAR-X Radarsat-2 SAR ATI. 3-5 해저지형 SAR. SAR., 유류 / 생물막. SAR ([ 12]). SAR, /. (a) Sub-image (b) 2-D spectrum (c) Buoy spectrum [ 그림 11] Wave extraction from PALSAR [25] [ 그림 12] SAR images captured Hebei Spirit oil spill on the west coast of the Korean peninsula in December 2007 [24] 62

9 韓國電磁波學會誌第 22 卷第 6 號 2011 年 11 月, /. SAR. 3-7 선박탐지 SAR. ([ 14]). SAR (ship wake),. azimuth,., SAR.,, ([ 14]). SAR. SAR, (ripple mark) Bragg SAR,. SAR.. 극지활용분야 3-8 조간대,,, [ 그림 13] Ship detection from L-band SAR images of Uraga channel, Japan in November 2009 [26] [ 그림 14] TerraSAR-X HH images of intertidal zone of west coast of Korea obtained on July 3, Green polygon means mud flats, red sand flats and blue for mixed flats [27] 63

10 SAR / SAR.,,. 4-1 빙하연구 SAR,,,. SAR. DInSAR, ([ 15]). DInSAR (grounding line). /.. SAR. (polynya), SAR. DInSAR ([ 16]). 4-3 빙상 / 빙붕 (ice sheet), (ice shelf) SAR., (mass balance) SAR. 4-2 해빙 SAR., (ridge), (a) 1-day interferogram (b) 8-day interferogram [ 그림 15] Cosmo-SkyMED interferograms of Campbell glacier, Antarctica [28] [ 그림 16] Freeman-Durden decomposition of iceberg (IB), unclassified iceberg (DIB), and sea ice (SI) [29] 64

11 韓國電磁波學會誌第 22 卷第 6 號 2011 年 11 月. 대기활용분야 참고문헌 SAR,.,,,, SAR. SAR. 2-6 / GPS.. 결론 SAR,,,. SAR SAR,. X- SAR 5, SAR., SAR,,. 9 Asia- Pacific Synthetic Aperture Radar(APSAR) 2011 SAR SAR. [1] J. C. Curlander, R. N. McDonough, Synthetic Aperture Radar Systems and Signal Processing, John Wiley & Sons Inc., New York, [2] W. M. Brown, "Synthetic aperture radar", IEEE Trans. Aeros. Electron. Systems, vol. AES-3, no. 2, pp , [3] W. G. Carrara, R. S. Goodman, and R. M. Majewski, Spotlight Synthetic Aperture Radar: Signal Processing Algorithms, Artech House, Boston, MA, [4] S. Ahmed, H. R. Warren, D. Symonds, and R. P. Cox, "The radarsat system", IEEE Trans. Geosci. Remote Sens., vol. 28, no. 4, pp , [5] C. Oliver, S. Quegan, Understanding Synthetic Aperture Radar Images, Artech House, [6] T. Toutin, "Opposite-side ERS-1 SAR stereo mapping over rolling topography", IEEE Trans. Geosci. Remote Sens., vol. 34, no. 2, pp , [7] S. R. Cloude, K. P. Papathanassiou, "Polarimetric SAR interferometry", IEEE Trans. Geosci. Remote Sens., vol. 36, no. 5, pp , [8] H. A. Zebker, T. G. Farr, R. P. Salazar, and T. H. Dixon, "Mapping the world's topography using radar interferometry: the TOPSAT mission", Proceedings of the IEEE, vol. 82, no. 12, pp , [9] A. Ferretti, C. Prati, and F. Rocca, "Permanent scatterers in SAR interferometry," IEEE Trans. on Geosci. and Remote Sensing, vol. 39, no. 1, pp. 8-20, [10] J. A. Kong, "Polarimetric remote sensing", Progr. Electromagn. Res., vol. 3, Elsevier,

12 SAR [11] A. Reigber, A. Moreira, "First demonstration of airborne SAR tomography using multibaseline L- band data", IEEE Trans. Geosci. Remote Sens., vol. 38, no. 5, pp , [12] R. Gens, J. L. Genderen, "SAR interferometry - issues, techniques, applications", Int. J. Remote Sens., vol. 17, no. 10, pp , [13], "SAR SAR,, ",, vol. 22, no. 2, pp , [14] R. Bamler, P. Hartl, "Topical review - synthetic aperture radar interferometry", Inverse Problems, vol. 14, pp. R1-R54, [15] N. Ishitsuka, N. Tomiyama, T. Yamanokuchi, G. Saito, C. Yonezawa, and S. Ogawa, "Project for development of application using satellite image to measure paddy rice planted area in Japancase of PALSAR", APSAR2011, pp , [16] Q. Song, H. Zhang, F. Liang, Y. Li, and Z. Zhou, "Results from an airship-mounted ultrawideband synthetic aperture radar for penetrating surveillance", APSAR2011, pp , [17] N. Parihar, A. Das, M. S. Nathawat, and S. Mohan, "Accuracy assessment of DEMs derived from multi-frequency SAR images", APSAR2011, pp , [18] F. Cai, F. Lombardini, D. Pasculli, and F. Viviani, "Tomo and Diff-Tomo SAR methodologies: Recent advances for urban and forest applications", APSAR2011, pp , [19] S. -W. Kim, T. H. Dixon, F. Amelung, and S. Wdowinski, "A time-series deformation analysis from TERRASAR-X SAR data over new orleans, USA", APSAR2011, pp , [20] S. Sun, N. Serizawa, and Masato Furuya, "Conjugate earthquake rupture associated with two recent intraplate strike-slip earthquakes", APSAR 2011, pp , [21] G. G. Ponnurangam, Y. S. Rao, "Soil moisture mapping using ALOS PALSAR and ENVISAT ASAR data over India", APSAR2011, pp , [22] S. -W. Kim, G. -W. Yoon, and J. -S. Won, "Urban monitoring using TERRASAR-X SAR data", APSAR2011, pp , [23] M. Sugimoto, K. Ouchi, "Rotation of polarimetric matrices and its effects on classification accuracy of man-made structures by synthetic aperture radar", APSAR2011, pp , [24] D. -J. Kim, "Monitoring of coastal wind and oil spill using KOMPSAT-5", APSAR2011, pp , [25] O. Isoguchi, M. Shimada, "Extraction of ocean wave parameters by ALOS/PALSAR", APSAR 2011, pp , [26] M. Arii, "Ship detection from full polarimetric SAR data at different incidence angles", APSAR 2011, pp , [27] Y. K. Lee, J. -S. Won, "Using X-band synthetic aperture radar data to monitor salt marsh", APSA R2011, pp , [28] H. Han, H. Lee, "Motion of campbell glacier, east antarctica, observed by satellite and groundbased interferometric synthetic aperture radar", APSAR2011, pp , [29] J. -W. Kim, D. -J. Kim, S. -H. Kim, and B. -J. Hwang, "Iceberg detection using full-polarimetric RADARSAT-2 data in west Antarctica", APSAR2011, pp ,

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