在重轨干涉实际测量中，两次飞行航迹难以保持高度重合，飞行高度和姿态不稳定，干涉图像对存在明显不规则的相对形变，难以进行三维定位。通过分析重轨机载InSAR图像对的几何形变和形成原因，提出一种从精准的InSAR成像几何关系出发，通过修正成像参数，实现机载重轨InSAR高精度三维定位的方法。该方法通过引入地面控制点，实现干涉图像对精准的相对定位，生成高精度DEM；并利用高精度DEM，实现机载重轨InSAR高精度三维定位。对比检查点实测结果和定位结果，表明该方法可有效地解决机载重轨InSAR的三维定位困难的问题。
In realistic measurement of repeat pass interferometric synthetic aperture radar (RP-InSAR), two flight tracks do not coincide. The position shift and attitude of platforms keep changing. Irregular and obvious geomorphing is showed on interferometric complex images. It is difficult to calculate the 3D positioning of InSAR images. We analyzed the causes and effects of geometric distortions. A high precision positioning method is proposed, which is based on the high accuracy of InSAR imaging geometry. By correcting imaging parameters, the method achieves high accuracy 3D location of airborne RP-InSAR. InSAR image registration is achieved by extracting identical points. DEM with high accuracy is generated after interferometry. The high accuracy DEM is used to calculate the 3D positioning of InSAR images. Comparison between the measured positions and calculated positions of checkpoints shows that the proposed method is effective in solving the problem of 3D location of airborne RP-InSAR.
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