Staring spotlight images with a spatial resolution of up to tens of centimeters are good data sources for urban applications including displacement mapping. However, phase discontinuities, layover, and shadowing effect are also associated with staring spotlight interferograms, adding to the difficulties in height estimation and spatial phase unwrapping. The scattering mechanism of the staring spotlight images in the urban environment is complicated, thus it is difficult to simulate and remove the reference height of staring spotlight interferograms directly. In addition, global spatial phase unwrapping networks tend to smooth phase discontinuities. With the aim of implementing height estimation and phase unwrapping for TerraSAR-X Staring Spotlight interferograms, a workflow for phase unmixing of TerraSAR-X staring spotlight interferograms is proposed in this paper. The PS height is estimated in the baseline domain rather than the spatial domain. Taking into account the length and height change of each connection, the spatial phase unwrapping network is adjusted and segmented into isolated networks. The connected components of the adjusted spatial phase unwrapping network can be identified using graph theory. Spatial phase unwrapping is implemented in individual networks. The unfolded height phase is separated from the unwrapped phase, and the remaining phase is deformation dominated. Compared with the traditional global spatial phase unwrapping method, this study demonstrates the feasibility of the proposed least squares parameter search and graph partition based workflow in urban area, for phase unmixing of TerraSAR-X staring spotlight interferograms in building scale for PS height and deformation, as evidenced by external LiDAR DSM and temperature records.

空间分辨率高达数十厘米的凝视聚光灯图像是用于城市应用（包括位移映射）的良好数据源。然而，相位不连续、重叠和阴影效应也与凝视聚光灯干涉图有关，增加了高度估计和空间相位展开的困难。城市环境中凝视聚光图像的散射机制复杂，难以直接模拟和去除凝视聚光干涉图的参考高度。此外，全局空间相位展开网络倾向于平滑相位不连续性。为了实现 TerraSAR-X 凝视聚光灯干涉图的高度估计和相位展开，本文提出了一种用于 TerraSAR-X 凝视聚光灯干涉图相位分离的工作流程。PS高度是在基线域而不是空间域中估计的。考虑到每个连接的长度和高度变化，调整空间相位展开网络并分割成孤立的网络。可以使用图论识别调整后的空间相位展开网络的连通分量。空间相位展开在单个网络中实现。展开高度阶段与展开阶段分离，其余阶段以变形为主。与传统的全局空间相位展开方法相比，本研究证明了所提出的最小二乘参数搜索和基于图划分的工作流在城市地区的可行性，