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Proceedings Paper

Noise performance of the NPOESS Airborne Sounder Testbed Interferometer (NAST-I) sounder: flight and model results
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Paper Abstract

NAST-1 is a Fourier transform interferometric sounder that provides very high spectral and spatial resolution measurements of the Earth's atmosphere. The interferometer provides two dimensional, low noise data from the NASA ER-2 aircraft suitable for synthesizing data products of future satellite-borne sounding instrument candidates. It is the first such high altitude aircraft or satellite borne instrument. The instrument provides a 2.6 km nadir footprint and a cross-track field of regard of +/- 48.2 degrees. The instrument has a continuous spectral range of 3.6-16.1 micrometers , spectral resolution of 0.25 cm-1, and radiometric noise on the order of 0.25 K. NAST-1 has proven to be an extremely reliable instrument generating over 100 hours of high-quality flight data, and was delivered to the sponsor on a very tight schedule. Using a first principles model, the noise performance of the instrument was modeled and found to be in close agreement with noise measured in- flight. Alignment jitter has been identified as the major contributor to the system NEdN. This paper describes the mode used to predict the instrument noise performance and discusses the comparison to actual flight data.

Paper Details

Date Published: 24 September 1999
PDF: 9 pages
Proc. SPIE 3750, Earth Observing Systems IV, (24 September 1999); doi: 10.1117/12.363520
Show Author Affiliations
Michael W. Kelly, MIT Lincoln Lab. (United States)
Michael J. Gazarik, MIT Lincoln Lab. (United States)
Richard M. Marino, MIT Lincoln Lab. (United States)


Published in SPIE Proceedings Vol. 3750:
Earth Observing Systems IV
William L. Barnes, Editor(s)

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