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Proceedings Paper

FLEX: fluorescence explorer
Author(s): Marc-Philippe Stoll; Andrew J. Court; Kees Smorenburg; Huib Visser; Luiggi Crocco; Jyro Heilimo; Andre Honig
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Paper Abstract

FLEX is a scientifically driven space mission to provide demonstration/validation of the instrumentation and technique for measuring the natural fluorescence of vegetation in the Fraunhofer lines. The payload consists of high spectral resolution (0.1 - 0.3 nm) CCD imaging grating spectrometer with two channels: one in the red (648 - 664 nm) and one in the blue (391 - 438 nm) for working with several Fraunhofer lines. The across track FOV is 8.4 degrees; ground spatial resolution is better than 0.5 X 0.5 km2. To increase the S/N ratio a steering mirror will be used, if necessary, to 'freeze' the image and also to provide plus or minus 4 degrees across track depointing. Calibration is made by viewing the sun via a diffuser plate switched into the telescope field of view. A separate CCD camera will allow cloud detection and scene identification. A TIR radiometer will provide simultaneous surface temperature measurements. The spacecraft, overall mass estimated at 200 kg, is derived from the ASI-MITA bus which provides all the necessary subsystems and stabilized platform. By use of on-board storage, ground requirements for satellite control and data link are minimized; the possibility of local stations for real time reception/distribution is also envisaged. Provisional orbit characteristics are: LEO sun synchronous, 500 - 900 km altitude. Priority will be given to highest revisit frequency on a sufficient number of selected test sites.

Paper Details

Date Published: 17 December 1999
PDF: 8 pages
Proc. SPIE 3868, Remote Sensing for Earth Science, Ocean, and Sea Ice Applications, (17 December 1999); doi: 10.1117/12.373106
Show Author Affiliations
Marc-Philippe Stoll, Univ. of Strasbourg (France)
Andrew J. Court, TNO-TPD (Netherlands)
Kees Smorenburg, TNO-TPD (Netherlands)
Huib Visser, TNO-TPD (Netherlands)
Luiggi Crocco, Carlo Gavazzi Space S.p.A. (Italy)
Jyro Heilimo, Space Systems Finland (Finland)
Andre Honig, Data Tools Products (France)

Published in SPIE Proceedings Vol. 3868:
Remote Sensing for Earth Science, Ocean, and Sea Ice Applications
Giovanna Cecchi; Edwin T. Engman; Eugenio Zilioli, Editor(s)

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