Ground deformation monitoring of Zhengzhou city from 2012 to 2013 using an improved IPTA
Ground deformation monitoring of Zhengzhou city from 2012 to 2013 using an improved IPTA
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DOI：
10.1007/s11069-015-1953-x
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Hong-lei Yang;Junhuan Peng;Bao-cun Wang;Yong-Seon Song;DingXuan Zhang;Lihua Li
中科院分区：
文献类型：
--
作者：
Hong-lei Yang;Junhuan Peng;Bao-cun Wang;Yong-Seon Song;DingXuan Zhang;Lihua Li
针对干涉点目标分析处理高分辨率SAR数据效率低的问题，提出了一种新的干涉点目标细化方法和一种改进的滤波方法，以降低大尺度大气相位延迟。采用基于点密度的细化方法来保证PS点的质量，保留低密度区域的点，去除高密度区域的冗余点。分析变薄PSs有助于快速获得初始大气延迟，方便了时间相位展开，提高了参数计算的效率。同时，提出了一种融合多视、空间滤波和空间插值的大尺度大气相位延迟滤波方法。与传统的空间滤波方法相比，该方法简单、快速。以郑州市2012 - 2013年为例，验证了该方法将传统数据处理方法的效率提高了一倍。通过与地面水准测量的对比，本案例的变形速度精度可达3.16 mm/a。
To address the low efficiency of interferometric point target analysis for processing high-resolution SAR data, this paper proposes a novel thinning method for interferometric point target and an improved filtering method to reduce the large-scale atmospheric phase delay. The thinning method is used to ensure the quality of PS point based on point density, by which points in low-density area are kept, while redundant points in high-density area are removed. Analyzing thinned PSs is helpful in quickly obtaining the initial atmospheric delay, which facilitates the temporal phase unwrapping and promotes the efficiency of parameter calculation. Meanwhile, this paper proposes a filtering method for large-scale atmospheric phase delay with the fusion of multi-looking, spatial filtering and spatial interpolation methods. This method is simple and quick, compared with traditional spatial filtering methods. The case study of Zhengzhou city from 2012 to 2013 verifies that this method doubles the efficiency of the traditional data processing methods. Also, the precision of deformation velocity in this case study is up to 3.16 mm/a based on the comparison with the ground leveling measurement.