Since April 2011 Communication Ocean Meteorological Satellite (COMS) is under normal operation service for the three missions of meteorological observation, ocean monitoring, and telecommunication service on 128.2° East of the geostationary orbit. The meteorological observation mission is done by the meteorological imager (MI) of the COMS, which observes the Earth to make meteorological images every day. Along with the Earth observation, the MI looks at the Moon every month to get the images of the Moon, which are used to check the variation of radiometric performance of the MI visible channel after the launch of the COMS. The monthly observation of the full Moon can be considered as a good way to avoid the variation of the Moon phase and to improve reliability in the check of optical payload performance using the Moon image. In this paper, the monthly variation of the Moon phase are studied in relation to the design characteristics of the MI and the operational concept for the Moon observation by the MI. And based on the simulation results and the real operation results for the Moon observation of the MI, this paper discusses realistic limit to the monthly observation of the full Moon in the aspect of the mission operation of the COMS.
Communication Ocean Meteorological Satellite (COMS) for the hybrid mission of meteorological observation, ocean monitoring, and telecommunication service was launched onto Geostationary Earth Orbit on June 27, 2010 and it is currently under normal operation service since April 2011. The COMS is located on 128.2° East of the geostationary orbit. In order to perform the three missions, the COMS has 3 separate payloads, the meteorological imager (MI), the Geostationary Ocean Color Imager (GOCI), and the Ka-band antenna. Each payload is dedicated to one of the three missions, respectively. The MI and GOCI perform the Earth observation mission of meteorological observation and ocean monitoring, respectively. For this Earth observation mission the COMS requires daily mission commands from the satellite control ground station and daily mission is affected by the satellite control activities. For this reason daily mission planning is required. The Earth observation mission operation of COMS is described in aspects of mission operation characteristics and mission planning for the normal operation services of meteorological observation and ocean monitoring. And the first year normal operation results after the In-Orbit-Test (IOT) are investigated through statistical approach to provide the achieved COMS normal operation status for the Earth observation mission.
Communication Ocean Meteorological Satellite (COMS) for the hybrid mission of meteorological observation, ocean monitoring, and telecommunication service was launched onto Geostationary Earth Orbit on June 27, 2010 and it is currently under normal operation service after the In-Orbit Test (IOT) phase. The COMS is located on 128.2° East of the geostationary orbit. In order to perform the three missions, the COMS has 3 separate payloads, the meteorological imager (MI), the Geostationary Ocean Color Imager (GOCI), and the Ka-band antenna. Each payload is dedicated to one of the three missions, respectively. The MI and GOCI perform the Earth observation mission of meteorological observation and ocean monitoring, respectively. During the IOT phase the functionality and the performance of many aspects of the COMS satellite and ground station have been checked through the Earth observation mission operation for the observation of the meteorological phenomenon over several areas of the Earth and the monitoring of marine environments around the Korean peninsula. The Earth observation mission operation of COMS during the IOT phase is introduced in terms of mission operation characteristics, mission planning, and mission operation results for the missions of meteorological observation and ocean monitoring, respectively.
Communication Ocean Meteorological Satellite (COMS) for the hybrid mission of meteorological observation, ocean
monitoring, and telecommunication service is planned to be launched onto Geostationary Earth Orbit in 2008. The
meteorological payload of COMS is an imager which will monitor meteorological phenomenon around the Korean
peninsular intensively and of Asian-side full Earth disk periodically. The meteorological imager (MI) of COMS has 5
spectral channels, 1 visible channel with the resolution of 1 km at nadir and 4 infrared channels with the resolution of 4
km at nadir. The characteristics of the COMS MI are introduced in the view points of user requirements, hardware
features, and operation characteristics.
A four-aspherical mirror system with unit magnification is investigated for use in deep ultraviolet (DUV) optical lithography. It is derived from the solution of all zero third-order aberrations for the four-spherical mirror system with unit magnification. We have first examined the holosymmetric four-spherical mirror system in which all third-order aberrations are zero and all orders of coma and distortion are also zero. However, the system does not have any optical design freedom left for the correction of higher order aberrations, so a new solution of nonholosymmetric system is derived. In this system aspherizations on the spherical surfaces are carried out to reduce the residual aberrations. The aspherization is optimized to give near diffraction-limited performance for DUV wavelengths of 0.193 μm (ArF excimer laser line). The final system we have obtained consists of all aspherized mirrors with a numerical aperture of 0.35. This reflective system is compact in size and expected to be useful in optical lithographic applications.
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