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
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