Theoretical expression for an ocean internal soliton synthetic aperture radar image and determination of the soliton characteristic half width
Theoretical expression for an ocean internal soliton synthetic aperture radar image and determination of the soliton characteristic half width
复制标题
DOI：
10.1029/2000jc000726
复制
发表时间：
2001-12
影响因子：
--
通讯作者：
Q. Zheng;Yeli Yuan;V. Klemas;Xiao‐Hai Yan
中科院分区：
文献类型：
--
作者：
Q. Zheng;Yeli Yuan;V. Klemas;Xiao‐Hai Yan
本文论述了卫星合成孔径雷达（SAR）海洋图像解译技术的发展。推导了Korteweg-de弗里斯型海洋内波孤子的雷达图像理论模型，并利用ERS-1 SAR和RADARSAT SAR图像的海洋内波信号对模型进行了验证。结果表明，该模型能较好地模拟雷达后向散射双符号变化的海洋内部孤子信号。在此基础上，提出了确定内孤子特征半宽度的曲线拟合法和峰-峰法，并将其用于计算内孤子振幅。实验结果表明，这两种方法得到的海洋内孤子振幅与葡萄牙大陆架和南海的实测数据吻合较好，具有一定的精度。分析了风场在海洋雷达遥感中的作用。最后，定量估计了海洋内波对雷达图像的调制比。
This paper deals with the development of techniques for satellite synthetic aperture radar (SAR) ocean image interpretation. We derived a theoretical model of a radar image for a Korteweg-de Vries type ocean internal soliton and validated the model using ocean internal wave signals taken from ERS-1 SAR and RADARSAT SAR images. The results indicate that the model perfectly simulates ocean internal soliton signatures with double-sign variations of radar backscatter. On the basis of the model, we developed the curve fitting method and the peak-to-peak method for determining the internal soliton characteristic half widths, which then were used to calculate the internal soliton amplitudes. The test results indicate that ocean internal soliton amplitudes derived by the two methods agree with in situ data acquired on the Portuguese Continental Shelf and in the South China Sea with reasonable accuracy. The role that wind fields play in ocean radar remote sensing was also analyzed. Finally, the modulation ratio of ocean internal waves on radar images was quantitatively estimated.