| 模型ID： | M00044 | ||||||
| 模型名称： | C波段海面雷达后向散射地球物理模型函数 | ||||||
| 模型编码者： |
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| 模型关键字： | 海面雷达后散射系数，主动微波遥感 | ||||||
| 模型类型： | 经验模型 | ||||||
| 模型最后修改日期： | |||||||
| 模型提交日期： | 2005/9/13 0:00:00 | ||||||
| 模型摘要： | 输入雷达入射角、方位角等观测几何参数以及风速和风向参数，该模型可估算C波段水平和垂直极化的海面雷达后向散射系数（NRCS） | ||||||
| 公式： |
| 1 |
名称：theta
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参数类型：double
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物理意义：入射角，度
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| 2 |
名称：phi_radar
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参数类型：double
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物理意义：雷达观测方位角, 度
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| 3 |
名称：phi_wind
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参数类型：double
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物理意义：风向，度
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| 4 |
名称：spd_wind
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参数类型：double
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物理意义：风速，米/秒
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| 5 |
名称：Sigma0
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参数类型：double
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物理意义：垂直和水平极化后向散射系数,分贝
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| 标题： | A Systematic Comparison of the Effect of Polarization Ratio Models on Sea Surface Wind Retrieval From C-Band Synthetic Aperture Radar | |||||||||||||||
| 文献作者： |
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| 文献引用： | IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING | |||||||||||||||
| 文献摘要: | Geophysical model functions (GMFs) for deriving sea surface wind from C-band synthetic aperture radar (SAR) are usually developed and well validated for VV-polarized data, e.g., CMOD5. For wind retrievals from HH-polarization data acquired by some SAR satellites, e.g., RADARSAT-1, part of RADARSAT-2 and ENVISAT ASAR, various Polarization Ratio (PR) models are used to convert normalized radar cross sections (NRCS) from HH to VV polarizations before a GMF is applied. In this study, 116 dual-polarization (VV and HH) C-band ENVISAT Advanced SAR (ASAR) Alternating Polarization (AP) mode images are collected to analyze the behavior of different empirical and theoretical PR models in SAR HH wind retrieval. A new PR model is also developed by analyzing ENVISAT ASAR AP data. SAR HH winds from CMOD5+PR models are validated against SAR VV winds from CMOD5 only. Results show that the proposed new PR model in conjunction with the CMOD5 GMF can constitute promising hybrid GMFs for wind speed retrievals with HH-polarized ENVISAT ASAR images. |
模型公式