AbstractAs part of the European Copernicus programme, the Sentinel-1 mission, based on a constellation of two SAR satellites, ensures continuity for Europe of C-band SAR observations. Sentinel-1A and Sentinel-1B were respectively launched from Kourou on 3rd April 2014 and 25th April 2016.Full Operations Capacity (FOC) of the mission is expected to be achieved following the completion of the operational qualification of the Sentinel-1 constellation (Sentinel-1A and Sentinel-1B), early 2017 indicatively.The presentation will give an overview of the overall mission status and will focus on the Sentinel-1A routine operations activities and the start of the Sentinel-1B operations. Topics including mission achievements, mission observation scenario of the constellation, ground segment operations performance, throughput and data access will be presented.