利用三维重建模型的机载InSAR区域网平差方法

A Method for Block Adjustment with Airborne InSAR by Aid of Three Dimensional Reconstruction Model

在机载合成孔径雷达干涉测量(synthetic aperture radar interferometry,InSAR)中,为了获取高精度的数字高程模型(digital elevation model,DEM),研究了机载InSAR视向量正交分解法及三维重建数学模型,分析了中国的机载CASMSAR(synthetic aperture radar system of Chinese Academy of Surveying and Mapping)干涉系统误差来源及观测参数,建立了机载InSAR区域网平差模型。利用国产机载CASMSAR系统获取的X波段干涉数据进行试验,利用高精度的控制点数据进行平差解算,结果表明本文方法能够消除干涉模型间平面和高程差异,DEM成果满足1∶1万山地测图精度要求,验证了该模型的正确性和有效性。

In order to improve the accuracy of DEM（digital elevation model）acquired by airborne InSAR（synthetic aperture radar interferometry）,we researched the orthogonal decomposition of visual vector model and three dimensional reconstruction model for airborne InSAR.Error sources and adjustment parameters of domestic airborne InSAR system of CASMSAR（synthetic aperture radar system of Chinese Academy of Surveying and Mapping）were analyzed.A block adjustment method was proposed for airborne InSAR which could be used to derive DEM.An Experiment was carried out with X-band interferometric data acquired by CASMSAR.And we used ground control points to correct this error model.The results show that the proposed algorithm could be used to eliminate the differences in plane and height among multi-strip in the overlapping area.Finally,the results met the requirements of topographic mapping at a scale of 1∶10 000,and proved the correctness and effectiveness of the new algorithm with CASMSAR data.