基于镜面散射的雷达探测浅海水下地形研究

Radar detecting shallow ocean under water bottom topography based on specular-point scattering

海面镜面散射建模及其应用方法是小入射角时雷达海洋遥感的关键问题。深入研究了基于格拉母—卡利尔(Gram-Charlier)分布的海面镜面散射建模方法,分析了其极化特性,将风速统一以海面上10 m高度为基准。通过与实测数据的比较,证明了其正确性和优越性。提出了采用Wu J方法估计海面均方斜率可改进其在中低风速时的性能,指出在应用时需要首先进行风速条件下的验证。进而将基于Gram-Charlier分布的海面镜面散射模型应用于雷达探测浅海水下地形。通过与实验结果的比较。

The ocean surface specular-point scattering modeling and its application methods are important for ocean radar remote sensing at low incidence angles. In this study, an ocean surface specular-point scattering model based on the Gram- Charlier distribution is proposed, and analysis of its polarization characteristic is presented. The comparison results of our model and observations show that they agree well with each other in general, and Wu J＇s ocean surface mean square slope model performs better in middle and low wind speeds. In addition, the ocean surface specular-point scattering model based on the Gram-Charlier distribution is applied to detection of shallow ocean bottom topography by imaging radar. The feasibility and advantage of this method are verified.