基于正侧视模型的机载双天线干涉SAR外定标方法

Studies on outside Calibration Method Based on the Boresight Model for Dual-antenna Airborne Interferometric SAR

采用基于敏感度方程的方法,研究了基于正侧视成像模型下的机载双天线干涉SAR系统的外定标问题。算法通过对干涉成像方程各参数求导,得到基于敏感度方程的误差模型,并在此基础上,依据若干地面控制点的精确数据,求解干涉参数偏差。通过迭代求解,得到定标后的干涉参数,并生成精确的数字高程模型及对地面目标点进行定位。利用我国自主设计、研制的机载干涉SAR系统获得的数据,进行了外定标处理实验,验证了方法的有效性。

Based on the boresight model for the Dual-antenna Airborne InSAR,the outside calibration was researched by adopting sensitivity equations. The error model based on sensitivity equations was educed by differentiating InSAR imaging equations. Then the biases of interferometric parameters were solved by several accurate Ground Control Points（GCPs）. The calibrated interferometric parameters were calculated by iteration method. And the accurate Digital Elevation Model （DEM） was reconstructed. Then the ground points were oriented. A set of InSAR data was adopted to do calibration experiments,which was derived by the Airborne InSAR system researched independently by Institute Of Electronics,Chinese Academy Of Sciences. The experimental results show that this algorithm is efficient.