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作 者:方东生[1,2,3] 吕孝雷 李芳芳[1,3] FANG Dongsheng;LYU Xiaolei;LI Fangfang(Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China)
机构地区:[1]中国科学院电子学研究所,北京100190 [2]中国科学院大学,北京100049 [3]空间信息处理与应用系统技术重点实验室,北京100190
出 处:《雷达科学与技术》2018年第1期21-29,共9页Radar Science and Technology
基 金:百人计划项目(No.Y53Z180390);国家自然科学基金(No.61401428);GF3共性处理技术(No.03-Y20A11-9001-15/16)
摘 要:机载干涉SAR获取DEM的过程中,绝对相位与展开后的相位存在一个常数相位偏移量。这需要利用照射区域内角反射器的地理信息去估计这个偏置。然而,人工布设角反射器浪费人力物力。同时,在一些危险区域人工布设和测量角反射器也是难以实施的。为了克服这一限制,相位偏移量可以利用外源DEM提取的地面控制点去估计,然后通过斜坡相位模型迭代估计误差。由于机载重轨干涉SAR的时变基线误差会影响算法中斜坡相位估计模型与线性求解的匹配性能,从而影响算法估计精度。提出了一种兼顾时变基线估计和补偿的相位偏置迭代估计算法。机载C波段0.5m高分辨率重轨干涉SAR实测数据用于验证该算法的有效性,高程重建精度在4m以内。该方法简单快速,且能够消除对人工角反射器的依赖性,适合无定标点情况下机载InSAR的DEM反演。In the process of digital elevation model(DEM)generation by using airborne interferometric synthetic aperture radar(InSAR),there is a constant phase offset between the absolute phase and the unwrapped interferogram.This operation is usually carried out by exploiting the geographic information provided by corner reflectors(CRs)that are deployed over the illuminated area.However,this is expensive in terms of human and material resources.Moreover,the deployment and measurement of CRs in unfriendly areas are difficult to conduct.To circumvent these limitations,phase offset can be calculated by exploiting ground control points(GCPs)from external DEM,and then the estimation error are calculated via slope-topography model iteratively.Since the time-varying baseline errors in repeat-pass airborne InSAR affect the matching performance between the slope-topography model and linear solver,the precision will be decreased.In this paper,an iterative phase offset calculation algorithm that considers time-varying baseline error estimation and correction is proposed.C-band airborne repeat-pass SAR data with 0.5 m resolution are used to test the proposed algorithm.The precision of rebuilt height is 4 m.The presented approach is very easy to implement and eliminate the dependency on the manual CRs.It is suitable for the airborne InSAR DEM generation without CRs.
关 键 词:机载SAR 干涉SAR 相位偏移量 时变基线误差估计和补偿 数字高程模型
分 类 号:TN959.3[电子电信—信号与信息处理] TN959.73[电子电信—信息与通信工程]
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