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TerraSAR-X, a radar Earth observation satellite, is a joint venture being carried out under a public-private-partnership between the German Aerospace Center (DLR) and EADS Astrium. The exclusive commercial exploitation rights are held by the geo-information service provider Astrium. TerraSAR-X was launched on June 15, 2007 and has been in operational service since January 2008. With its twin satellite TanDEM-X, launched June 21, 2010, TerraSAR-X acquires the data basis for the WorldDEM, the worldwide and homogeneous DEM available from 2014. ==Satellite and mission== With its phased array synthetic aperture radar (SAR) antenna (X-band wavelength 31 mm, frequency 9.6 GHz), TerraSAR-X acquires new high-quality radar images of the entire planet whilst circling Earth in a polar orbit at 514 km altitude. The orbit is selected such that the satellite flies in a sun-synchronous dusk-dawn orbit, which means that it moves along the day-night boundary of the Earth and always presents the same face to the sun, ensuring an optimum energy supply via the solar cells. TerraSAR-X is designed to carry out its task for five years, independent of weather conditions and illumination, and reliably provides radar images with a resolution of up to 1m. Features of TerraSAR-X: *resolution of up to 1 m, *excellent radiometric accuracy, *geometric accuracy unrivalled by any other commercial spaceborne sensor, *quick site access time of 2.5 days max. (2 days at 95% probability) to any point on Earth, *unique agility (rapid switches between imaging modes and polarisations) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「TerraSAR-X」の詳細全文を読む スポンサード リンク
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