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基于月球形貌数据的SAR干涉图像仿真

Simulation of SAR Interferometric Images Based on Lunar Topography

  • 摘要: 为了利用现有数据掌握月表SAR成像特点并辅助用于绕月SAR成像观测系统设计,提出一种基于月球形貌数据的月表SAR干涉图像仿真方案。该方案在给定绕月飞行轨道和基线参数的情况下,根据已有的月表DEM数据,按照设置的SAR成像观测参数计算相应的侧视角度,从而逐点计算对应月表的局部入射角,依据RD几何构像模型和干涉测高原理,按照设定的后向散射系数进行仿真计算,得到仿真的SAR幅度图像和干涉相位。采用格网间距为118 m的LOLA DEM进行了不同基线情况下的月表SAR干涉图像仿真,验证了仿真方案的有效性。

     

    Abstract: In order to understand the SAR imaging characteristics of the lunar surface and assist in the design of SAR imaging observation systems around the moon using existing data, a simulation scheme for lunar surface SAR images based on lunar topographic data is proposed. In this scheme, given the circumlunar trajectory and baseline parameters, the corresponding off-nadir angles are calculated based on the existing lunar Digital Elevation Model (DEM) data and the set SAR imaging parameters. The local incidence angles for each point on the lunar surface are then calculated, and the simulation is performed based on the RD model and interferometric height measurement principle, using the set backscattering coefficients. This process generates simulated SAR amplitude images and interferometric phases. The effectiveness of the simulation scheme was verified by simulating lunar surface SAR images under different baseline conditions using the LOLA DEM with a grid spacing of 118m.

     

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