SAR tomography as an add-On to PSI: Detection of coherent scatterers in the presence of phase instabilities

Muhammad Adnan Siddique, Urs Wegmüller, Irena Hajnsek & Othmar Frey
The estimation of deformation parameters using persistent scatterer interferometry (PSI) is limited to single dominant coherent scatterers. As such, it rejects layovers wherein multiple scatterers are interfering in the same range-azimuth resolution cell. Differential synthetic aperture radar (SAR) tomography can improve deformation sampling as it has the ability to resolve layovers by separating the interfering scatterers. In this way, both PSI and tomography inevitably require a means to detect coherent scatterers, i.e., to perform hypothesis...
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