基于参考DEM的机载InSAR定标方法

研究无人工靶标的干涉定标方法对促进机载InSAR技术在山区等复杂地形的测绘、制图等定量应用有重要的实用价值。本文提出一种新的基于参考DEM的干涉定标方法，在InSAR定标中用已知高程精度的参考DEM与待定标的InSAR系统生成的DEM进行比较，利用参考DEM模拟SAR图像，获得大量定标所需的控制点坐标来建立敏感度矩阵，并对敏感度方程的解算进行了改进，同时将干涉处理与定标过程相结合，改进了干涉处理过程，最后得到定标后的干涉参数并生成DEM，利用机载数据进行了实验验证，并分析了无人工靶标干涉定标实验结果的误差。

Calibration of Airborne Interferometric SAR Data Based on Reference DEM

It is significant to study the calibration method without artificial calibrators in terrain mapping and other applications of airborne InSAR in mountainous areas. A new calibration method based on reference DEM without any artificial calibrators is presented in this paper. A reference DEM with known accuracy is used to compare with the DEM generated from InSAR by simulated SAR image. A number of tie points are selected to be ground control points to build the sensitivity matrix via simulated SAR image. Resolving methods are improved based on sensitivity model and the processing of InSAR is combined with calibration to generate DEM. At last, the interferometric parameters are calibrated and the difference between InSAR DEM and reference DEM is calculated to evaluation the precision of calibration. This paper also illustrates the efficiency of this method to airborne InSAR data.