DESIS (DLR Earth Sensing Imaging Spectrometer for the ISS-MUSES platform)

Over the past 20 years, the DLR Institute of Optical Sensor Systems has been responsible for a variety of multi and hyperspectral instruments. This responsibility has included the design, manufacturing, calibration, verification and in orbit validation. In some programs the institute also participates at the subcomponent level, such as the VNIR-FPA (Boremann, 2001) on EnMAP (Janesick, 2001). Heritage missions and instruments from the institute also include MKS on IK21, MOS on MIR, MOS on IRS, MeRTIS on Bepi Colombo and Sentinel 4/5. A forthcoming instrument from the institute will be DESIS - the DLR Earth Sensing Imaging Spectrometer. DESIS will be the first instrument to be installed on ISS attached to the MUSES platform, which provides power, data-flow, and inertial pointing stabilization for up to four instruments. DESIS is a hyperspectral instrument with additional steering capability. The spectral sensitivity of DESIS will be optimized for the range of 400 nm-1000 nm based on an Offner spectrograph design and 235 equi-distant spectral bands. The scientific goals of the mission are to develop standard hyperspectral applications and an operational Earth-sensing capability in the VNIR and to use the BRDF as additional information source to proof the current atmospheric correction calculations (ISO/DTS 19159-1, 2014). The GSD of the DESIS instrument will be 30 m when aboard ISS at a 400 km orbital altitude (Jahn and Reulke, 2012). The paper will give an overview over the MUSES platform and the DESIS design in detail and will show the advantage by using the BRDF.