The accuracy of phase unwrapping in multi-temporal interferometric synthetic aperture radar (MT-InSAR) technology affect closely on the accuracy of ground deformation monitoring. In the urban area, urban infrastructures such as high-rise buildings present additional challenges to phase unwrapping due to the sudden elevation changes. The failure rate of phase unwrapping is often much higher in such areas, bringing more biases to the estimated deformation and height values. We propose a new method for MT-InSAR phase unwrapping especially for deformation monitoring in urban areas. The method isolates the propagation path of information by considering the building height information of a study area. Two quality controllers are also developed to refine the arc observation network structure for network adjustment and to correct the phase unwrapping errors. The proposed method is tested using both simulated and real datasets. The results show that the building height and the geolocation of the coherence points were estimated much more accurately, demonstrating the effectiveness of the proposed method in monitoring deformation of urban area.

多时相干涉合成孔径雷达（MT-InSAR）技术中相位展开的精度影响着地面变形监测的精度。在市区，高层建筑等城市基础设施由于海拔的突然变化而对相位展开提出了额外的挑战。在这些区域，相位展开的失败率通常要高得多，给估计的变形和高度值带来更多的偏差。我们提出了一种新的 MT-InSAR 相位展开方法，尤其适用于城市地区的变形监测。该方法通过考虑研究区域的建筑物高度信息来隔离信息的传播路径。还开发了两个质量控制器来细化弧观测网络结构以进行网络调整并纠正相位展开误差。所提出的方法使用模拟和真实数据集进行了测试。结果表明，建筑物高度和相干点的地理位置估计得更加准确，证明了所提出的方法在监测市区变形方面的有效性。