Francisco Ceba Vega, Marie Touveneau, Paul Snoeij, Ignacio Navas-Traver, Jelle Poupaert, Steve Osborne, Mario Cossu, Svein Løkås, Ana García Hernández, Björn Rommen, David Bibby, Dirk Geudtner, Ramón Torres
This manuscript presents the improvements implemented on the future Sentinel-1C/D spacecraft, which will eventually replace the current in-orbit Sentinel-1A/B satellites. Changes are based on the Sentinel-1A/B lessons learnt and on the addition of new functionalities to improve the system performance. More specifically, the modifications that will be covered in this paper are those that will enhance the performance of the mission. The addition of an Automatic Identification System (AIS) will provide ship position and identification while operating the SAR instrument. The Attitude and Orbit Control System (AOCS) will be upgraded to improve the pointing stability and to be compatible with the new Galileo signals. A novel mechanical bracket interfacing the SAR central panel and the platform has been designed to facilitate the disintegration during the re-entry. The propulsion system has also been modified to allow a faster orbit acquisition. The upgrades done on the SAR instrument to improve the radiometric stability will be also detailed.
KEYWORDS: L band, Synthetic aperture radar, Interferometry, Antennas, Space operations, Sensors, Data archive systems, Vegetation, X band, Climate change
TerraSAR-L is the new imaging radar mission of the European Space Agency, with Astrium Ltd. acting as Prime Contractor. The platform, based on the novel Snapdragon concept, is built around the active phase array antenna of the L-band Synthetic Aperture Radar (L-SAR). Specification of the L-SAR has been guided by careful analysis of the product requirements resulting in a robust baseline design with appropriate margins.
Besides providing commercial geo-information products, TerraSAR-L will contribute to the Global Monitoring for Environment and Security (GMES) initiative and serve the scientific user community. Major application areas are: Kyoto inventory and wetland monitoring, solid earth science including seismic and volcanic activity as well as land slides and subsidence, land cover classification in different levels of detail and marine applications. The TerraSAR-L operations strategy is based on a long-term systematic and repetitive acquisition scenario to ensure consistent data archives and to maximise the exploitation of this very powerful SAR system.
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