Initial On-Orbit Modulation Transfer Function Performance Analysis for Geostationary Ocean Color Imager

The world’s first geostationary ocean color imager (GOCI) is a three-mirror anastigmat optical system 140 mm in diameter. Designed for 500 m ground sampling distance, this paper deals with on-orbit modulation transfer function (MTF)measurement and analysis for GOCI. First, the knife-edge and point s...

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Bibliographic Details
Published in:Journal of astronomy and space sciences 2012, 29(2), , pp.199-208
Main Authors: Oh, Eun-Song, Kim, Sug-Whan, Cho, Seong-Ick, Ryu, Joo-Hyung, Ahn, Yu-Hwan
Format: Article
Language:English
Subjects:
geostationary ocean color imager
in-orbit performance
knife edge method
modulation transfer function
point source method
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Summary:The world’s first geostationary ocean color imager (GOCI) is a three-mirror anastigmat optical system 140 mm in diameter. Designed for 500 m ground sampling distance, this paper deals with on-orbit modulation transfer function (MTF)measurement and analysis for GOCI. First, the knife-edge and point source methods were applied to the 8th band (865 nm) image measured April 5th, 2011. The target details used are the coastlines of the Korean peninsula and of Japan, and an island 400 meters in diameter. The resulting MTFs are 0.35 and 0.34 for the Korean East Coastline and Japanese West Coastline edge targets, respectively, and 0.38 for the island target. The daily and seasonal MTF variations at the Nyquist frequency were also checked, and the result is 0.32 ± 0.04 on average. From these results, we confirm that the GOCI on-orbit MTF performance satisfies the design requirements of 0.32 for 865 nm wavelength.
ISSN:2093-5587
2093-1409
DOI:10.5140/JASS.2012.29.2.199