| The effect of wave breaking on surface wave imaging by Synthetic Aperture Radar |
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| 作者姓名： | 孙建 管长龙 史剑 |
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| 作者单位： | [1]Physical Oceanography Laboratory. Ocean University of China. Qingdao 266003, China [2]The College of Meteorology, the Institute of Science and Engineering of the P.L.A., Nanjing 211101, China |
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| 基金项目： | 国家科技攻关项目;科技部科研项目 |
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| 摘 要： | The effect of ocean wave breaking as a non-Bragg mechanism on backscattering cross-section and modulation transfer functions （MTF） of radar was investigated based on Bragg resonance theory and parametric method. The result showed that the additional effect of wave breaking on backscattering cross-section is not more than 20% except for the small incident angle of VV polarized electromagnetic （e.m.） wave but is significant for HH polarized e.m. wave. Breaking waves lead to increase in the modulus of tilt modulation MTF and the larger the wind speed, the faster the increase. For large incident angle, the modulus of tilt modulation MTF with wave breaking decreases quickly with incident angle for HH polarization and approach to that without wave breaking for VV polarization. The hydrodynamic MTF increases 30%-60% when considering wave breaking and the increase is larger for HH polarization than for VV polarization.
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| 关 键 词： | 雷达 孔径 海洋动力学 表面波 SAR |
| 收稿时间： | 2005-05-26 |
| 修稿时间： | 2005-08-18 |
The effect of wave breaking on surface wave imaging by Synthetic Aperture Radar |
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| Sun Jian,Guan Changlong,Shi Jian.The effect of wave breaking on surface wave imaging by Synthetic Aperture Radar[J].Chinese Journal of Oceanology and Limnology,2006,24(1):21-27. |
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| Authors: | Sun Jian Guan Changlong Shi Jian |
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| Institution: | (1) Physical Oceanography Laboratory, Ocean University of China, 266003 Qingdao, China;(2) The College of Meteorology, The Institute of Science and Engineering of the P.L.A., 211101 Banjing, China |
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| Abstract: | The effect of ocean wave breaking as a non-Bragg mechanism on backscattering cross-section and modulation transfer functions
(MTF) of radar was investigated based on Bragg resonance theory and parametric method. The result showed that the additional
effect of wave breaking on backscattering cross-section is not more than 20% except for the small incident angle of VV polarized
electromagnetic (e.m.) wave but is significant for HH polarized e.m. wave. Breaking waves lead to increase in the modulus
of tilt modulation MTF and the larger the wind speed, the faster the increase. For large incident angle, the modulus of tilt
modulation MTF with wave breaking decreases quickly with incident angle of HH polarization and approach to that without wave
breaking for VV polarization. The hydrodynamic MTF increases 30%–60% when considering wave breaking and the increase is larger
for HH polarization than for VV polarization.
Supported by the High-Tech Research and Development Program of China (863 Program. Nos. 2001AA633070 and 2003AA604040), and
the National Basic Research Program of China (973 Program. No. 2005CB422307) |
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| Keywords: | Synthetic Aperture Radar modulation transfer function wave breaking tilt modulation hydrodynamic modulation |
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