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地形对雷达影像的几何和辐射特性都有强烈的影响。对雷达影像进行定量分析和参数提取之前,必须对SAR影像进行精确的几何校正和辐射校正,消除地形的影响。基于RD定位模型和数字高程模型建立一种正射校正和地形辐射校正(TRC)方法。通过试验,从定性和定量两方面评价正射校正和地形辐射校正结果的有效性。比较基于投影角和基于局部入射角两种地形辐射校正方法,并对根据初始定位模型计算地形辐射校正因子的合理性进行分析。
Topography has a strong influence on the geometry and radiation characteristics of radar images. Before performing quantitative analysis and parameter extraction of radar images, SAR images must be precisely geometrically corrected and radiated corrected to eliminate the effects of terrain. A method of orthorectification and topographic radiation correction (TRC) based on RD location model and digital elevation model was established. Through experiments, the validity of orthorectification and topographic radiation correction results was evaluated both qualitatively and quantitatively. Based on the projection angles and the two methods of local radiation correction, the rationality of the terrain radiation correction factors based on the initial location model is analyzed.