多分辨率分析的InSAR轨道误差去除算法  

Orbital error removal algorithm of insar based on multi-resolution analysis

作　　者：何永红[1] 靳鹏伟[1] HE Yonghong;JIN Pengwei(Hunan University of Science and Engineering,Yongzhou,Hunan 425199,China)

机构地区：[1]湖南科技学院,湖南永州425199

出　　处：《测绘科学》2021年第7期128-136,共9页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41531068,41671356);湖南省自然科学资金项目(2020JJ4031);湖南科技大学测绘遥感信息工程湖南省重点实验室开放基金资助项目(E22137);湖南省教育科学规划课题研究成果项目(湘教科规通[2019]1号)。

摘　　要：针对传统的多项式模型去除InSAR轨道误差时,只能去除由于基线不准导致的平地相位残余误差,而对于基线误差引起的与高程相关的地形相位误差仍保留在干涉图中,提出了一种多分辨率分析的干涉相位轨道误差去除方法。从InSAR成像几何结构出发,分析轨道误差的空间特征,推导了由基线误差引起的平地相位误差及地形相位误差;再通过多分辨率分析把轨道误差与对流层延迟误差相位、外部DEM引起的地形误差相位、噪声相位等进行滤除,最后采用最小二乘计算多项式模型参数,可以更精细的估计出轨道误差相位,吸收与地形相关的误差。结果表明,经过改正的干涉图与DEM的相关系数仅0.0338,相对于线性模型和二次多项式模型的0.1655和0.0719,对地形相关轨道误差的去除改善程度达到79.1%和53.0%,能够更好地去除轨道误差,提高了轨道误差估计精度,吸收了与地形相关的误差。According to the problem that traditional polynomial model to remove InSAR orbit error,it can only remove phase residual error caused by the inaccurate baseline,the terrain phase error caused by baseline error and related to elevation is still retained in the interferogram,orbit error removing method is proposed based on the multi-resolution analysis.Based on the imaging geometry of InSAR,the spatial characteristics of orbit errors are analyzed,and the phase errors of flat ground and terrain caused by baseline errors are theoretically derived.By means of multi-resolution analysis,the orbit error is separated from the tropospheric delay error phase,terrain error phase and noise phase caused by external DEM,then the least square method is used to calculate the parameters of the polynomial model.It can estimate the orbital error phase more precisely and absorb the orbit error related to terrain.The results show that this method can better remove the orbit error,the correlation coefficient between the corrected interferogram and DEM is only 0.0338,compared with the linear model 0.1655 and a quadratic polynomial model0.0719,improvement of the topographical correlation orbit error reached 79.1%and 53.0%.The proposed method can remove the orbit error better,improve the estimation accuracy of the orbit error,and absorb the errors related to the terrain.

关 键 词：合成孔径干涉雷达 线性模型 二次多项式 多分辨率分析 轨道误差 地形相关 

分 类 号：P237[天文地球—摄影测量与遥感]