面向多基线干涉SAR高程反演的全局最优相干方法

本文针对多基线极化干涉SAR数据,提出了面向多基线干涉SAR高程反演的全局最优相干方法。该方法将多景全极化干涉影像联合在一起,构建多基线极化相干矩阵,由多基线最优相干准则指导,求解全局条件下的最优干涉图。该方法可以有效降低多基线干涉中散射中心不一致对干涉相位影响,从而提高干涉相位的精度和可靠性,并提高最终获取DEM的精度。利用国产X-SAR系统和德国E-SAR系统获取的多基线全极化数据进行全局最优相干方法试验,利用多基线极化最优相干方法生成全局条件下的最优干涉图,依据多基线高程反演方法计算目标高程,验证了本文提出的方法的有效性。

A Global Optimal Coherence Method for Multi-basel ine InSAR Elevation Inversion

A global optimal coherence method for elevation inversion from multi-basel ine polarimetric InSAR data is proposed.The multi-basel ine polarimetric InSAR data used in experiments were obtained by Chinese X-SAR system and Germany’s E-SAR system.Through combining several ful l polarimetric InSAR images,the proposed method constructs the multi-basel ine polarimetric InSAR coherency matrix,and solves the optimal interferograms under global optimal coherence criterion.The optimal interferograms generated by global optimal coherence method were used to calculate the elevation of target with multi-basel ine InSAR elevation inversion method.The proposed method reduces the influence of different scattering centers effectively using multi-basel ine InSAR,which improves the accuracy and rel iabi l ity of the interferometric phase and eventual ly improves the accuracy of DEM.The results verify the val idity of the proposed method.