| The efifect 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： | Physical Oceanography Laboratory，Physical Oceanography Laboratory，The College of Meteorology Ocean University of China，Qingdao 266003，China，Ocean University of China，Qingdao 266003，China，the Institute of Science and Engineering of the P. L. A.，Nanjing 211101，China |
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| 基金项目： | Supported by the High-Tech Research and Development Program of China (863 Program. Nos. 2001AA633070 and 2003AA604040)the National Basic Research Program of China (973 Program, No. 2005CB422307) |
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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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The efifect of wave breaking on surface wave imaging by Synthetic Aperture Radar |
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| SUN Jian GUAN Changlong SHI Jian.The efifect of wave breaking on surface wave imaging by Synthetic Aperture Radar[J].Chinese Journal of Oceanology and Limnology,2006(1). |
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| Authors: | SUN Jian GUAN Changlong SHI Jian |
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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 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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| Keywords: | Synthetic Aperture Radar modulation transfer function wave breaking tilt modulation hydrody-namic modulation |
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