Orbit Altitude: 693 km
Orbit Type: LEO > Low Earth Orbit > Polar Sun-Synchronous

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[Launch Date: Estimated October 2013]

The Sentinel-1 series of satellites will address the issue of data continuity for SAR data at large. The immediate priority is to ensure such continuity for ... C-band data. Under the current scenario, provision of ENVISAT data to feed SAR-based services is likely to cease in the 2008-2010 timeframe. In order to meet the need for continuity, and taking into account the availability of Radarsat-2, the first Sentinel 1 satellite should be launched before the end of the Envisat operations.

The experience with ERS, Envisat and Radarsat constitutes the basis for the Sentinel-1 mission requirements and concept.

Summary Source: http://www.esa.int/esaLP/SEMZHM0DU8E_LPgmes_0.html

http://www.esa.int/esaEO/SEMXK570A2G_environment_0.html
http://www.esa.int/esaLP/SEMZHM0DU8E_LPgmes_0.html
http://ec.europa.eu/gmes/index_en.htm
http://en.wikipedia.org/wiki/Sentinel_1