Initial On-Orbit Modulation Transfer Function Performance Analysis for Geostationary Ocean Color Imager
| Autor: | Yu Hwan Ahn, Joo-Hyung Ryu, Eunsong Oh, Sug Whan Kim, Seongick Cho |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
lcsh:Astronomy
business.industry Point source Ground sample distance Anastigmat General Physics and Astronomy point source method Geostationary Ocean Color Imager lcsh:QB1-991 Wavelength modulation transfer function Optics Optical transfer function knife edge method Orbit (dynamics) General Earth and Planetary Sciences Environmental science Nyquist frequency geostationary ocean color imager in-orbit performance business Remote sensing |
| Zdroj: | Journal of Astronomy and Space Sciences, Vol 29, Iss 2, Pp 199-208 (2012) |
| ISSN: | 2093-5587 |
| DOI: | 10.5140/jass.2012.29.2.199 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|