Initial on-orbit modulation transfer function performance analysis for geostationary ocean color imager SCOPUS KCI

Title
Initial on-orbit modulation transfer function performance analysis for geostationary ocean color imager
Author(s)
Oh, E.; Kim, S.-W.; Cho, S.; Ryu, J.-H.; Ahn, Y.-H.
KIOST Author(s)
Ryu, Joo Hyung(유주형)
Alternative Author(s)
오은송; 조성익; 유주형; 안유환
Publication Year
2012
Abstract
The world's first geostationary ocean color imager (GOCI) is a three-mirror anastigmat optical system 140mm 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 865nm wavelength. © The Korean Space Science Society.
ISSN
2093-5587
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3721
DOI
10.5140/JASS.2012.29.2.199
Bibliographic Citation
Journal of Astronomy and Space Sciences, v.29, no.2, pp.199 - 208, 2012
Publisher
Korean Space Science Society
Keywords
Geostationary ocean color imager; In-orbit performance; Knife edge method; Modulation transfer function; Point source method
Type
Article
Language
English
Document Type
Article
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