S ENTINEL-1 (S-1) is an imaging synthetic aperture radar (SAR) mission at C-band designed to supply all-weather day-and-night imagery to a number of operational Earth observation-based services. The mission is composed of a constellation of satellites for Earth observation, which was developed within the Copernicus program [previously known as Global Monitoring for Environment and Security (GMES)], i.e., the European program for the establishment of a European capacity for Earth observation [1].The most relevant applications cover (but are not limited to) mapping in support of humanitarian aid in crisis situations, monitoring sea and ice zones (arctic, surveillance of marine Manuscript
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