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Three priorities (fast-track services) for the mission have been identified by user consultation working groups of the European Union: Marine Core Services, Land Monitoring and Emergency Services. The objective of Sentinel-1 is to assure C-band SAR data continuity for the user community currently provided by Envisat and ERS-2. EADS Astrium GmbH of Friedrichshafen, was in turn awarded a contract by TAS-I to build the radar imaging payload for Sentinel-1, including the central radar electronics subsystem developed by Astrium UK. ESA awarded the contract to TAS-I on Jat the Paris International Air Show. In April 2007, ESA selected TAS-I (Thales Alenia Space Italia) as prime contractor for the Sentinel-1 spacecraft (overall satellite design & integration at system and subsystem level, including the design of the SAR antenna's transmit/receive modules).

Ambiguity ratio: DTAR (Distributed Target Ambiguity Ratio) = -25 dB.

Sensitivity: NESZ (Noise Equivalent Sigma Zero), σ o = -25 dB.

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Data delivery from archive within 24 hours Near real-time delivery of data within 3 hours (worst case) with 1 hour as goal Consistent, reliable and conflict free mission operations

Polarization: Dual polarization for all modes VV+VH or HH+HV.

Wave mode (WM): 20 km x 20 km, 20 m x 5 m resolution, single-look Interferometric Wide Swath mode (IWS): 240 km swath, 25 m x 80 m resolution, 3-looks Extra Wide Swath mode (EWS): 400 km swath, single-look Interferometric Wide Swath mode (IWS): 240 km swath, 5 m x 20 m resolution, single-look Stripmap mode (SM): 80 km swath, 5 m x 5 m resolution, single-look

Orbit: Sun-synchronous near-polar orbit, repeat cycle of 12 days, cycle length of 175 days.

The baseline mission concept under development is a two-satellite constellation, with four nominal operational modes on each spacecraft designed for maximum compliance with user requirements. Short revisit time demands for an appropriate orbit selection and large swath widths. The key mission parameters are revisit time, coverage, timeliness combined with frequency band, polarization, resolution and other image quality parameters. The mission ensures continuity of C-band SAR data to applications and builds on ESA's heritage and experience with the ERS and Envisat SAR instruments, notably in maintaining key instrument characteristics such as stability and accurate well-calibrated data products. The Sentinel-1 mission represents a completely new approach to SAR mission design by ESA in direct response to the operational needs for SAR data expressed under the EU-ESA GMES (Global Monitoring for Environment and Security) program. The Sentinel-1 mission is expected to enable the development of new applications and meet the evolving needs of GMES, such as in the area of climate change and associated monitoring. Additional inputs come from on-going GMES projects funded by ESA, the EU, and ESA/EU member states. Special emphasis is placed on services identified in ESA's GSE (GMES Service Element) program. The overall objective of the Sentinel-1 mission is to provide continuity of C-band SAR operational applications and services in Europe. Table 1: Copernicus is the new name of the former GMES program 1)

Thanks to greater data availability user take-up will increase, thus contributing to that growth that we so dearly need today.”

Copernicus has now reached maturity as a programme and all its services will enter soon into the operational phase. As he was the catalyst in the 16 th century to better understand our world, so the European Earth Observation Programme gives us a thorough understanding of our changing planet, enabling concrete actions to improve the quality of life of the citizens. In the words of Antonio Tajani: “By changing the name from GMES to Copernicus, we are paying homage to a great European scientist and observer: Nicolaus Copernicus (1473-1543). The new name was announced on December 11, 2012, by EC (European Commission) Vice-President Antonio Tajani during the Competitiveness Council. The Kopernikus missions (Sentinel-1, -2, and -3) represent the EU contribution to GEOSS (Global Earth Observation System of Systems).Ĭopernicus is the new name of the European Commission's Earth Observation Programme, previously known as GMES (Global Monitoring for Environment and Security). Sentinel-1 is the European Radar Observatory, representing the first new space component of the GMES (Global Monitoring for Environment and Security) satellite family, designed and developed by ESA and funded by the EC (European Commission). Copernicus: Sentinel-1 - The SAR Imaging Constellation for Land and Ocean Services