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Proceedings Paper

Description of the HIRDLS radiometric model (HIRAM)
Author(s): Brian R. Johnson; William G. Mankin; John C. Gille
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Paper Abstract

We describe a radiometric model developed to simulate the transfer of time-dependent radiant and electrical signals through the High Resolution Dynamics Limb Sounder (HIRDLS). HIRDLS is an infrared limb-scanning satellite radiometer with 21 spectral channels defined by individual narrow band interference filters covering the spectral range from 6 to 18 micrometer. HIRDLS is scheduled to fly onboard the NASA Earth Observing System Chemistry platform to be launched early in the next century. The scientific objectives for HIRDLS place demanding requirements on instrument calibration and radiometric stability, particularly at low signal levels. The HIRDLS Radiometric Model (HIRAM) was developed to provide an analysis tool for evaluating the radiometric sensitivity to various subsystem parameters and observational conditions in support of requirements analyses and conceptual design studies. Instrument characteristics are modeled using analytic expressions where appropriate. HIRAM incorporates the results of detailed design and performance analyses conducted elsewhere (e.g. APART straylight analyses) as input parameters to the model. Random effects, such as detector noise, are generally modeled as band-limited white Gaussian noise. Where spectral dependence is important, such as modeling random line-of-sight jitter, a power spectral density function is used to define the frequency content of a random error source.

Paper Details

Date Published: 18 November 1998
PDF: 9 pages
Proc. SPIE 3437, Infrared Spaceborne Remote Sensing VI, (18 November 1998); doi: 10.1117/12.331337
Show Author Affiliations
Brian R. Johnson, National Ctr. for Atmospheric Research (United States)
William G. Mankin, National Ctr. for Atmospheric Research (United States)
John C. Gille, Univ. of Colorado/Boulder (United States)


Published in SPIE Proceedings Vol. 3437:
Infrared Spaceborne Remote Sensing VI
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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