18 Years of interferometry, as seen from POLIMI

The progressive expansion of the applications of Synthetic Aperture Radar from airborne or satellite platforms is due to its capabilities of imaging through clouds and during the nights; further, the coherent character of the images has allowed the onset of interferometry, namely the use of the phases of the radiation. The goal of this contribution is to recollect some episodes of the development of the technology, as viewed from our observatory, namely the Politecnico di Milano. Inevitable bias will follow.