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http://dx.doi.org/10.5140/JASS.2012.29.2.199

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

Oh, Eun-Song (Korea Ocean Satellite Center, Korea Ocean Research & Development Institute)
Kim, Sug-Whan (Space Optics Laboratory, Department of Astronomy, Yonsei University)
Cho, Seong-Ick (Korea Ocean Satellite Center, Korea Ocean Research & Development Institute)
Ryu, Joo-Hyung (Korea Ocean Satellite Center, Korea Ocean Research & Development Institute)
Ahn, Yu-Hwan (Korea Ocean Satellite Center, Korea Ocean Research & Development Institute)
Publication Information
Journal of Astronomy and Space Sciences / v.29, no.2, 2012 , pp. 199-208 More about this Journal
Abstract
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 $0.32{\pm}0.04$ 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.
Keywords
geostationary ocean color imager; modulation transfer function; in-orbit performance; knife edge method; point source method;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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