HSRS: A STUDY FOR A SPACEBORNE
D. Simeoni, R. Krawczyk, Jp. Chessel
100 bld di Midi
06322 Cannes La Bocca, Cedex FRANCE
Officine Galileo (Italy)
Norsk Elektro Optikk (Norway)
From the parametric analyses of several candidate designs (dispersive spectrometer, Fourier Transform spectrometer, hybrid [Forurier Transform with grating] spectrometer), the second one, with on-board signal processing, has been selected as the only solution able to meet the requirements of a high spectral resolution sounding from geostationary altitude. The proposed instrument covers the 670-2700 cm-1 spectral range (split into 3 spectral bands) with a relative spectral resolution of 1 to 2 X 10 -3 (0.002). The pixel size on ground is 10 km. The sampling distance between two recordings can be modified, allowing to satisfy, with the same instrument, the constraints on both operational modes, namely the Mesoscale mission (Europe coverage within 1 hour) and the Synoptic Scale mission (the whole Earth coverage within 2 hours with a wider sampling distance).
The instrument volume is less than 1 m3, its mass in the order of 230 kg and the needed power roughly 400 W.