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Proceedings Paper

PRISM on-board characterization
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Paper Abstract

PRISM is a future spaceborne hyperspectral imager, to operate in the spectral range from 450 nm to 12.3 micrometers . The PRISM instrument designer faces a challenging requirement - the absolute radiometric accuracy of the instrument in the range from 450 nm to 2350 nm shall be better than 2 percent of the measured radiance. This requirement can only be met using highly accurate characterization sources and a thermally stable instrument. In the DSS PRISM concept a calibration module is located separate from the optical module on an adjacent platform panel. The characterization sources are accessed via a pointing mirror, which is protruding over the platform edge. THis configuration allows for a wide across track coverage and access to the three on- board characterization units and to cold space. The three on-board characterization units are an aperture plate with small hole apertures for direct sun viewing, a reflective diffuser and a blackbody with selectable heater levels. Laser sources illuminating the diffuser serve as spectral references. The high accuracy in the VNIR/SWIR range is achieved by subsequent characterization measurements using the aperture plate and the diffuser: the first serves as absolute radiation reference for a limited amount of pixels, whereas the later will provide uniform illumination of all pixels and thus allows to correlate the sensitivities of the absolutely measured pixels to the others.

Paper Details

Date Published: 27 January 1997
PDF: 9 pages
Proc. SPIE 2957, Advanced and Next-Generation Satellites II, (27 January 1997); doi: 10.1117/12.265442
Show Author Affiliations
Winfried Posselt, Dornier Satellitensysteme GmbH (Germany)
Daniel R. Lobb, Sira Ltd. (United Kingdom)
Philip N. Slater, Optical Sciences Ctr./Univ. of Arizona (United States)
Umberto Del Bello, European Space Agency/ESTEC (Netherlands)
Roland Meynart, European Space Agency/ESTEC (Netherlands)

Published in SPIE Proceedings Vol. 2957:
Advanced and Next-Generation Satellites II
Hiroyuki Fujisada; Guido Calamai; Martin N. Sweeting, Editor(s)

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