Slope and hydrodynamic modulation of radar scatter from the sea

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI:10.1109/OCEANS.1993.326203

V. Hesany, R. Moore, S. Haimov

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引用次数: 1

Abstract

Microwave backscatter from the ocean surface is largely due to Bragg scattering from short surface ripples. Modulation of the signal results from changes in the local angle of incidence as the local slope changes, and from variations in Bragg ripple amplitude. The slope (tilt) modulation can be modeled as a memoryless nonlinear system. The hydrodynamic modulation results from a nonuniform distribution of the amplitude of the small-scale ripples over the large-scale waves. For azimuthally traveling waves the hydrodynamic modulation dominates, while for waves propagating in other directions, both tilt and hydrodynamic modulation are significant. The authors developed a 35-GHz radar vector slope gauge (VSG) to measure the orthogonal components of the surface slopes within the radar footprint. Simultaneous measurements of the surface slope and radar cross section permit determination of the relative contribution of slope and hydrodynamic modulations to the overall fluctuation of the radar signal. The authors present a method for separating effects due to the surface tilting from hydrodynamic effects. They include a sample result based on this approach with data from the SAXON-FPN experiment in November, 1990.<>

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海上雷达散射的坡度和水动力调制

来自海洋表面的微波反向散射主要是由于来自海洋表面短波纹的布拉格散射。随着局部斜率的变化，局部入射角的变化和布拉格纹波幅度的变化导致了信号的调制。斜率(倾斜)调制可以建模为无记忆非线性系统。水动力调制是由于小尺度波纹振幅在大尺度波浪上的不均匀分布造成的。对于方向传播的波，水动力调制占主导地位，而对于其他方向传播的波，倾斜和水动力调制都很重要。作者开发了一种35 ghz雷达矢量坡度计(VSG)，用于测量雷达足迹内表面坡度的正交分量。同时测量地表坡度和雷达横截面，可以确定坡度和水动力调制对雷达信号总体波动的相对贡献。作者提出了一种分离表面倾斜效应和水动力效应的方法。其中包括1990年11月SAXON-FPN实验数据中基于这种方法的样本结果

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Proceedings of OCEANS '93

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