PRISM on-board characterization

Winfried Posselt; Daniel R. Lobb; Philip N. Slater; Umberto Del Bello; Roland Meynart

doi:10.1117/12.265442

27 January 1997 PRISM on-board characterization

Winfried Posselt, Daniel R. Lobb, Philip N. Slater, Umberto Del Bello, Roland Meynart

Proceedings Volume 2957, Advanced and Next-Generation Satellites II; (1997) https://doi.org/10.1117/12.265442
Event: Satellite Remote Sensing III, 1996, Taormina, Italy

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.

Citation Download Citation

Winfried Posselt, Daniel R. Lobb, Philip N. Slater, Umberto Del Bello, and Roland Meynart "PRISM on-board characterization", Proc. SPIE 2957, Advanced and Next-Generation Satellites II, (27 January 1997); https://doi.org/10.1117/12.265442

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