Interferometric Estimation of Three-Dimensional Surface Deformation using Geosynchronous Circular SAR
Interferometric Estimation of Three-Dimensional Surface Deformation using Geosynchronous Circular SAR
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DOI：
10.1109/taes.2012.6178082
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发表时间：
2012-04
影响因子：
4.4
通讯作者：
Leilei Kou;Xiao-qing Wang;M. Xiang;Min-hui Zhu
中科院分区：
文献类型：
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作者：
Leilei Kou;Xiao-qing Wang;M. Xiang;Min-hui Zhu
圆形合成孔径雷达（SAR）在地球同步轨道上成像是一种创新的SAR成像模式，它可以产生高分辨率的三维（3D）图像，并提供大范围的24小时连续监视。本文利用地球同步圆形合成孔径雷达（GEOCSAR），通过重复通道干涉测量，高效地生成高分辨率三维地表位移图。GEOCSAR成像覆盖区域可以从不同视点方向进行映射；因此，可以每天提供三维位移。首先，我们推导了GEOCSAR干涉相位与地表变形之间的联系，以解析解释其解析变形三个分量的能力。然后，为了检索变形的三个分量，推导了检索矩阵。此外，对观测相位矢量和反演矩阵中的误差进行了分析，并对这些误差传播到变形矢量中的方式进行了建模。为了减小变形测量的误差，通过选择合适的参数和使矩阵的条件个数最小来优化检索矩阵。最后，仿真结果验证了分析的正确性，给出了三个子孔径下的三维检索变形，并表明使用最优检索矩阵时精度有所提高。
Circular synthetic aperture radar (SAR) imaging on the geosynchronous orbit is an innovative SAR imaging mode, which can produce high-resolution three-dimensional (3D) images and offer 24-h continuous surveillance of a broad area. In this paper, we use the geosynchronous circular synthetic aperture radar (GEOCSAR) to efficiently produce high-resolution 3D surface displacement maps by repeat pass interferometry. The coverage areas with GEOCSAR imaging can be mapped from different view directions; thus, a 3D displacement can be provided daily. First, we derive the connection between the GEOCSAR interferometric phase and the surface deformation for analytically interpreting its capability to resolve the three components of the deformation. Then, to retrieve the three components of the deformation, a retrieval matrix is deduced. Furthermore, analyses of the errors in the observation phase vector and retrieval matrix are described, and the way these errors propagate into the deformation vector is modeled. To reduce the errors of the deformation measurement, the retrieval matrix is optimized by choosing appropriate parameters and making the condition number of the matrix minimal. Finally, the simulation results validate the correctness of the analysis, and the 3D retrieval deformation is presented with three subapertures and shows an improvement of accuracy when the optimal retrieval matrix is used.