NPOESS airborne sounder testbed interferometer (NAST-I) signal processing and initial flight test results

Michael J. Gazarik; Lawrence M. Candell; Edward T. Leonard; Steven Prutzer

doi:10.1117/12.325656

3 October 1998 NPOESS airborne sounder testbed interferometer (NAST-I) signal processing and initial flight test results

Michael J. Gazarik, Lawrence M. Candell, Edward T. Leonard, Steven Prutzer

Author Affiliations +

Proceedings Volume 3439, Earth Observing Systems III; (1998) https://doi.org/10.1117/12.325656
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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.

Citation Download Citation

Michael J. Gazarik, Lawrence M. Candell, Edward T. Leonard, and Steven Prutzer "NPOESS airborne sounder testbed interferometer (NAST-I) signal processing and initial flight test results", Proc. SPIE 3439, Earth Observing Systems III, (3 October 1998); https://doi.org/10.1117/12.325656

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