The EnMAP hyperspectral imaging spectrometer: instrument concept, calibration and technologies

The Environmental Mapping and Analysis Program (EnMAP) is a German space based hyperspectral mission planned for launch in 2012. The hyperspectral instrument covers the wavelength range from 420nm to 2450nm using a dual spectrometer layout. Both f/3 spectrometers employ a prism disperser for maximum throughput and are linked to the common foreoptics by a micromechanical field splitter. Together with custom designed silicon and MCT-based detector arrays this sensor design exhibits a peak system SNR of 1000 at 495nm and of more than 300 at 2200nm. Stable and precise in orbit performance is ensured by a multi loop thermal control system and a system calibration which relies on onboard sources as well as a full aperture diffuser.