水下地形在雷达图像上的可视模型及数值模拟  

The Visible Model and Numerical Simulation of Underwater Bottom Topography in Radar Imagery

作　　者：董庆[1] 唐军武[1] 冯林新[1] 

机构地区：[1]国家海洋局海洋技术研究所,天津300111

出　　处：《海洋通报》1997年第1期29-34,共6页Marine Science Bulletin

基　　金：国家海洋局海洋技术研究所课题基金项目资助

摘　　要：本文提出了一个在三维空间上潮汐流与海面共同作用区的水下地形在合成孔径雷达(SAR)图像上的“可视”化原理,得出水下地形成像的综合表面模式,探求在雷达分辨单元内中等尺度的表面波成倾斜对雷达后向散射的贡献。这些贡献携带有水下地形因子的定量信息,除了倾斜调制外还考虑了表面长波引起的Bragg波的水动力调制.SAR图像所携带的水下地形信息不仅与雷达极化方向而且与探测为向即风向有很大的关系。Based on Bragg scattering theory, the three dimesion model for the synthetic aperture radar(SAR)imaging of underwater bottom topography in the tidal waters is presented in the paper. All the factors that can take part in imaging in a SAR system are taken into account. The main modulation inclusion in the SAR resolution cell is the tilt modulation and the hydrodynamic modulation of the Bragg waves along the long surface waves. Particularly the wind azimuth (relative to the incidence angles) is at the important position comparing the other factors. The normalized radar cross section (NRCS)in the model is cut into the individual components in order to analyze each element contribution. The topography information in the SAR image appears alternatively, and the optimum SAR image for retrieving the quantified underwater bottom topography is HH polarization, the 40°-50° angle between the incidence and the wind azimuth.

关 键 词：水下地形 雷达图像 可视模型 数值模拟 

分 类 号：P737.22[天文地球—海洋地质]