SAR Tomography for 3D Reconstruction and Monitoring

SAR Tomography extends the SAR imaging concept to the third dimension of height. SAR tomography is also known as Multidimensional SAR Imaging technique due to the capability of full 3D imaging plus time monitoring. The vertical synthetic aperture exploited by SAR Tomography allows improving resolution and tightening responses of the different interfering scatterers then giving a chance to detect and localize separately each scattering mechanism. This capability has a major importance in the processing of urban areas, where the presence of buildings causes very frequent occurrence of layover between building façades, surrounding structures and ground, and is own of the tomographic approach: neither other interferometric approaches nor specifically the PSI can counteract this interference because of the leading assumption of only one scattering mechanism per pixel and of the phase-only signal model which do not cope with an imaging viewpoint.