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Proceedings Paper

NPOESS airborne sounder testbed interferometer (NAST-I) signal processing and initial flight test results
Author(s): Michael J. Gazarik; Lawrence M. Candell; Edward T. Leonard; Steven Prutzer
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Paper Abstract

As a testbed to evaluate instrument specifications and data reduction techniques for future satellite atmospheric sounders, an airborne Fourier transform interferometer sounder has been developed for the National Polar-orbiting Operational Environmental Satellite System (NPOESS). The NPOESS Airborne Sounder Testbed Interferometer (NAST-I) collects atmospheric sounding from NASA's high-altitude ER-2 aircraft. Flown at a nominal 20km altitude, collected data is meant to simulate spaceborne atmospheric sounding. The NAST interferometer generates high quality interferograms over the 3.7-16.1 micrometers IR range with a resolution of 0.25cm-1. Interferograms are collected in real-time by an embedded TI TMS320C32 digital signal processing chip housed in an industrial grade 133MHz Pentium PC. Three channels of analog interferogram data and one channel of telemetry data are acquired by four, 16-bit analog to digital converters. Oversampling and decimation are then used to produce high-fidelity samples at a reduced rate and to relax analog filter design requirements. This paper focuses on the signal processing aspects of the instrument and discuss test flight data collected during the instrument's initial flight test.

Paper Details

Date Published: 3 October 1998
PDF: 12 pages
Proc. SPIE 3439, Earth Observing Systems III, (3 October 1998); doi: 10.1117/12.325656
Show Author Affiliations
Michael J. Gazarik, MIT Lincoln Lab. (United States)
Lawrence M. Candell, MIT Lincoln Lab. (United States)
Edward T. Leonard, MIT Lincoln Lab. (United States)
Steven Prutzer, MIT Lincoln Lab. (United States)

Published in SPIE Proceedings Vol. 3439:
Earth Observing Systems III
William L. Barnes, Editor(s)

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