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Proceedings Paper

MODIS and ASTER airborne simulators system description
Author(s): Patrick S. Grant; Edward A. Hildum; Michael C. Peck
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Paper Abstract

NASA has built two airborne multi-spectral sensors to simulate space-borne instruments recently launched on the EOS (Earth Observing System) Terra satellite. The MODIS Airborne Simulator (MAS) and the MODIS/ASTER Simulator (MASTER) were designed to provide initial data sets to EOS investigators for algorithm development. MAS and MASTER are currently conducting calibration and validation under-flights for the MODIS and ASTER orbital instruments. These imaging spectrometers produce 50 spectral channels of 16-bit co-registered imagery data, from the blue wavelengths out though the thermal IR bands. Both systems share a common digitizer design developed originally for MAS. Greater accuracy and flexibility is achieved with high precision digital signal processors (DSPs) and field programmable gate arrays controlling the zero restoration, gain and antialiasing oversampling. Digitization rates of up to 100K samples per second per channel allow five-times oversampling at 6.25 scans per second and single sampling at 25 scans per second, resulting in aggregate data rates up to 2 Megabytes per second to disk. Both systems were designed for possible unattended operation on a NASA-ER2, but also support a realtime operator display for interactive mission evaluation on DOE’s B200 and NASA’s DC8. System design, characterization and performance will be covered by this paper.

Paper Details

Date Published: 15 November 2000
PDF: 9 pages
Proc. SPIE 4132, Imaging Spectrometry VI, (15 November 2000); doi: 10.1117/12.406586
Show Author Affiliations
Patrick S. Grant, Science Applications International Corp. (United States)
Edward A. Hildum, Science Applications International Corp. (United States)
Michael C. Peck, Berkeley Camera Engineering (United States)

Published in SPIE Proceedings Vol. 4132:
Imaging Spectrometry VI
Michael R. Descour; Sylvia S. Shen, Editor(s)

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