omoSAR技术在城市形变监测中的应用

Multi-baseline SAR tomography is an extension of Permanent Scatterer SAR Interferometry (PS-InSAR), in which the distribution of scatterers in the elevation direction and the corresponding reflectivity inside one resolution cell can be retrieved. In this way, TomoSAR aims at real and unambiguous 3D SAR imaging, i.e. imaging also in the third coordinate: elevation. Besides the 3D positions of the superimposed point scatterers, the deformation velocity of each scatterer can also be retrieved by differential SAR tomography. The problem of the layover effect in urban environments can be solved with this new technology, and hence making deformation surveillance of urban infrastructure possible. After the launch of the new generation of high-resolution SAR satellites, a huge amount of high resolution SAR data has been provided for urban deformation surveillance. First, the basic principles of multi-baseline SAR tomography are illustrated, followed by the development of SAR tomography algorithms and applications. In the end, the existing problems in SAR tomography research has been discussed, and an outlook into the ultimate means of urban deformation surveillance is given.