星载SAR浅海水下地形和水深测量模拟仿真──水下地形高度、坡度和方向与可测水深分析
Simulation study of sea bottom topography mapping by spaceborne SAR——Relationship between topographic parameters and measurement of water depth
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摘要: 根据星载合成孔径雷达(SAR)浅海水下地形和水深成像机理,建立了浅海水下地形和水深雷达后向散射截面仿真模型.利用该模型模拟并分析了不同地形条件下,浅海水下地形的雷达后向散射截面.分析结果表明,水下地形高度越高,SAR可测量的水深越深;水下地形坡度越大,越易被SAR所观测.水下地形的星载SAR测量还与水下地形的方向有关,与卫星飞行方向平行的水下地形最易被SAR观测,与卫星飞行方向垂直的水下地形最不易被SAR观测.Abstract: A simulation model for the radar backscattering cross-section(σ0) of the sea surface has been developed based on the synthetic aperture radar(SAR) imaging mechanism of sea bottom topography.The relationship between topographic parameters and SAR mapping of sea bottom topography has been analyzed using the results of the simulation model.It is shown that water depth measured by SAR increases with increase of the height of the bottom topography.The bigger the slope of topography is,the easier it can be observed by SAR.SAR mapping of sea bottom topography also depends on the direction of the topography.The optimal direction of topography is the direction parallel to the flight direction of satellite while the perpendicular direction is the worst.
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Key words:
- synthetic aperture radar /
- sea bottom topography /
- simulation
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