基于模型的稀疏控制点下机载InSAR定标中CP连接点选取方法

摘要

High-precision height acquisition needs to correct the interferometric parameters errors by interferometric calibration for Interferometric Synthetic Aperture Radar (InSAR) system with many Ground Control Points (GCPs). For the situation that some areas probably only have little GCPs or even no GCPs, a new high-precision calibration method for airborne InSAR based on bundle adjustment is needed, in which the Control Points (CP) selection method is a major point which has a crucial influence on the precision of InSAR calibration. A model-based CP selection method for calibration of airborne InSAR with sparse GCPs is proposed in this paper, which adopts the polynomial model fit method to choose CP based on the sensitivity characteristic of inSAR interferometric parameters. A joint calibration is made with the real InSAR data and the results confirm the validity and rationality of the proposed method.%　　高精度的高程测量需要利用较多地面控制点(Ground Control Point, GCP)通过干涉定标来校正干涉合成孔径雷达(Interferometric Synthetic Aperture Radar, InSAR)系统干涉参量误差,针对部分区域可能只有少数控制点甚至没有控制点的情况,需要采用新的基于区域网平差理论的高精度机载InSAR定标方法,该方法中CP(Control Point)连接点的选取是影响InSAR定标精度的关键环节。该文提出了一种基于模型的稀疏控制点下机载InSAR定标中CP连接点的选取方法,该方法基于InSAR干涉参量敏感度特性采用多项式模型拟合的方法来选取CP连接点。通过对实测机载InSAR数据进行区域联合定标处理,验证了该方法的有效性和合理性。