Optimal 3D deformation measuring in inclined geosynchronous orbit SAR differential interferometry
Optimal 3D deformation measuring in inclined geosynchronous orbit SAR differential interferometry
复制标题
倾斜地球同步轨道SAR差分干涉测量中的最佳3D变形测量
DOI：
10.1007/s11432-016-9083-4
复制
发表时间：
2017-06-01
影响因子：
8.8
通讯作者：
Cui, Chang
中科院分区：
文献类型：
--
作者：
Hu, Cheng;Li, Yuanhao;Cui, Chang
利用低轨合成孔径雷达（LEO SAR）的十字航向航迹数据，利用差分干涉合成孔径雷达（D-InSAR）技术可以获得目标的三维形变。但该方法存在时间采样率低、三维形变恢复范围和精度有限等缺点。针对上述问题，以地球同步轨道（GEO）SAR平台为例，首先推导了GEO SAR多角度处理中的三维形变表达式及相应的误差。为了获得较高的三维变形反演精度，提出了一种基于位置精度因子最小化的多角度数据选择方法。此外，神经网络被用来分析在不同的轨道配置和地理位置的三维变形的反演精度。最后通过仿真实验验证了所提出的方法和理论分析的正确性。利用选取的最优多角度数据，可以获得厘米级甚至毫米级的三维形变反演精度。
Three dimensional (3D) deformation can be obtained by using differential interferometric synthetic aperture radar (D-InSAR) technique with the cross-heading tracks data of low earth orbit (LEO) SAR. However, this method has drawbacks of the low temporal sampling rate and the limited area and accuracy for 3D defor- mation retrieval. To address the aforementioned problems, by virtue of a geosynchronous (GEO) SAR platform, this paper firstly demonstrates the expressions of 3D deformation and the corresponding errors in GEO SAR multi-angle processing. An optimal multi-angle data selection method based on minimizing position dilution of precision (PDOP) is proposed to obtain a good 3D deformation retrieval accuracy. Moreover, neural network is utilized for analyzing the accuracy of the retrieved 3D deformation under different orbit configurations and geo-locations. Finally, the proposed methods and the theoretical analysis are verified by simulation experiments. A 3D deformation retrieval accuracy of the order of centimeter-level or even millimeter-level can be obtained by using the selected optimal multi-angle data.