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Principal Component Noise Filtering for NAST-I Radiometric CalibrationThe National Polar-orbiting Operational Environmental Satellite System (NPOESS) Airborne Sounder Testbed- Interferometer (NAST-I) instrument is a high-resolution scanning interferometer that measures emitted thermal radiation between 3.3 and 18 microns. The NAST-I radiometric calibration is achieved using internal blackbody calibration references at ambient and hot temperatures. In this paper, we introduce a refined calibration technique that utilizes a principal component (PC) noise filter to compensate for instrument distortions and artifacts, therefore, further improve the absolute radiometric calibration accuracy. To test the procedure and estimate the PC filter noise performance, we form dependent and independent test samples using odd and even sets of blackbody spectra. To determine the optimal number of eigenvectors, the PC filter algorithm is applied to both dependent and independent blackbody spectra with a varying number of eigenvectors. The optimal number of PCs is selected so that the total root-mean-square (RMS) error is minimized. To estimate the filter noise performance, we examine four different scenarios: apply PC filtering to both dependent and independent datasets, apply PC filtering to dependent calibration data only, apply PC filtering to independent data only, and no PC filters. The independent blackbody radiances are predicted for each case and comparisons are made. The results show significant reduction in noise in the final calibrated radiances with the implementation of the PC filtering algorithm.
Document ID
20110015826
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Tian, Jialin
(NASA Langley Research Center Hampton, VA, United States)
Smith, William L., Sr.
(Hampton Univ. VA, United States)
Date Acquired
August 25, 2013
Publication Date
September 19, 2011
Subject Category
Geophysics
Report/Patent Number
NF1676L-11986
Meeting Information
Meeting: SPIE Remote Sensing Europe 2011
Location: Prague
Country: Czech Republic
Start Date: September 19, 2011
End Date: September 22, 2011
Sponsors: International Society for Optical Engineering
Funding Number(s)
WBS: WBS 509496.02.01.01.03
Distribution Limits
Public
Copyright
Public Use Permitted.
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