| 水稻微波后向散射系数的模拟分析 |
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| 引用本文： | 曾琪明,马洪兵,张涛.水稻微波后向散射系数的模拟分析[J].遥感学报,2000,4(1):14-21. |
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| 作者姓名： | 曾琪明 马洪兵 张涛 |
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| 作者单位： | 中国科学院遥感应用研究所!北京100101 |
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| 基金项目： | 国家863 计划!818 主题0602 课题 |
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| 摘 要： | 海洋雷达后向散射回波主要来自短重力波的Ｂｒａｇｇ 散射，这种散射与海面风场信息、边界层涡旋等密切相关。因此，可以从雷达散射截面反演风场信息。对１９９４ 年４ 月航天飞机成像雷达（ＳＩＲＣ／ＸＳＡＲ）获取的南中国海合成孔径雷达（ＳＡＲ） 图像进行了分析研究。利用ＳＩＲＣ 数据，从ＳＡＲ 图像谱提取了风向；根据ＣＭＯＤ４ 模型，从Ｃ波段雷达后向散射系数反演风速；利用双尺度散射模型对反演的风速进行了对比分析。结果表明，从ＳＩＲＣ雷达数据可以反演海面风矢量，星载ＳＡＲ是提取海面风场信息的有效技术手段之一。
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| 关 键 词： | SIRC/XSAR 风矢量 散射模型 |
Simulation and Analysis for the Microwave Backscattering Coefficient of Rice |
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| ZENG Qi ming,MA Hong bing and ZHANG Tao.Simulation and Analysis for the Microwave Backscattering Coefficient of Rice[J].Journal of Remote Sensing,2000,4(1):14-21. |
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| Authors: | ZENG Qi ming MA Hong bing and ZHANG Tao |
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| Institution: | Institute of RS & GIS, Peking Univeristy, Beijing 100871, China;Institute of RS & GIS, Peking Univeristy, Beijing 100871, China;Institute of RS & GIS, Peking Univeristy, Beijing 100871, China |
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| Abstract: | The radar backscattering from the ocean surface results mainly from the Bragg scattering caused by the short gravity waves, which are related to wind vector, boundary layer phenomena, etc. Hence, it is reasonable to retrieve the wind field information from the radar cross section of the ocean surface. Much work has been done on deriving the ocean spectra from SAR imagery and wind speed from radar cross section. In this paper, the (SIR C)/(X SAR) data acquired in April, 1994 are analyzed over the South China Sea. Firstly, the SAR image spectra are calculated, and the wind direction is estimated. The wind speed is derived using the sigma naught of the C band data with the CMOD4 model. The results are validated with the composite model. It is shown that SAR is one of useful tools for the retrieval of comprehensive wind information over the ocean. |
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| Keywords: | SIR C/X SAR wind vector scattering model |
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