| 講演名 | 2009-11-02 Wave Height Estimation by Velocity Bunching Simulation Using SAR Data(WSANE 2009 (Workshop for Space, Aeronautical and Navigational Electronics)) , |
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| 抄録(英) | The waves that primarily cause variations in SAR (Synthetic Aperture Radar) image scattered from the ocean surface are the Bragg-waves in which wavelength is matched to the projection of the SAR electromagnetic wavelength onto the local ocean surface. It is agreed that range travelling waves are detected by their NRCS (Normalised Radar Cross Section) modulation, and azimuthly travelling waves are imaged by the velocity bunching mechanism. Therefore, long waves that travel in azimuthly direction cannot be detected by the Bragg-waves scattering mechanism. In the this study, wave imaging mechanisms were investigated using airborne Pi-SAR (Polarimetric-Interferometric SAR) X-band (9.5GHz) VV images of ocean waves around the Miyake Island at approximately 180km south from Tokyo, Japan. Two images of a same scene were produced at approximately 20min. interval from two directions at right angles. One image shows dominant range travelling waves, but the other image shows a different wave pattern. This difference can be caused by the different image modulations of RCS and velocity bunching. In this study, 18 sub-images are extracted, and the directional wave spectra are compared to each other of the two different areas. We have estimated the dominant wavelength from the image of range waves, and from the wave phase velocity computed from the dispersion relation, the image intensity is computed by using the velocity bunching model. The comparison of the result with the second image at right angle strongly suggests the evidence of velocity bunching. Furthermore, it is shown that the waveheight, 1.4m, estimated in this way is similar to the height of 1.5m simulated using the MM5 numerical weather model and data assimilation by JWA (Japan Weather Association). |
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| キーワード(英) | Wave height / SAR / Pi-SAR / Velocity Bunching Simulation |
| 資料番号 | SANE2009-91 |
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| 研究会 | SANE |
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| 開催期間 | 2009/10/26(から1日開催) |
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| 申込み研究会 | Space, Aeronautical and Navigational Electronics (SANE) |
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| 本文の言語 | ENG |
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| タイトル（英） | Wave Height Estimation by Velocity Bunching Simulation Using SAR Data(WSANE 2009 (Workshop for Space, Aeronautical and Navigational Electronics)) |
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| キーワード(1)（和/英） | / Wave height |
| 第 1 著者 氏名（和/英） | / Chan-Su YANG |
| 第 1 著者 所属（和/英） | Korea Ocean Satellite Center Ocean Satellite Remote Sensing & Observation Technology Research Department Korea Ocean Research & Development Institute |
| 発表年月日 | 2009-11-02 |
| 資料番号 | SANE2009-91 |
| 巻番号（vol） | vol.109 |
| 号番号（no） | 265 |
| ページ範囲 | pp.- |
| ページ数 | 5 |
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