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윤형식(Youn, Heong-Sik),김용승(Kim, Yongseung) 한국항공우주연구원 2015 항공우주산업기술동향 Vol.13 No.1
By now we hold the ability to develop the submeter high resolution satellite. It is the outcome of continuous development supported by the government demand and upbringing policy. Korea started the sales of satellite images by KOMPSAT-1 in 2000 and made a full-scale attempt to sell the KOMPSAT-2 images in 2007. Despite such efforts, the business outcome has not been improved because of some entry barriers. We are now faced with the times that force us to enter the global market of satellite images for the better business outcome, using the past experience and domestic infrastructure. Unlike our case, the American, French, and Canadian companies develop the emerging market and occupy the 75% of world market. The business strategy of these advanced countries is that: 1) the government fosters the relevant business companies to strengthen the competitiveness and to equip the growth engine. 2) the company establishes the growth platform to develop the foreign market, while providing its government users with satellite images and services. Under the changing environment of global market of satellite images, we examine whether or not our paradigm with the emphasis on the public services is suitable for global marketing of our satellite images. As a first step to meet the demands of the times, we suggest the strategic approaches to enhance the export of satellite images.
System MTF and SNR Analysis on the MSC Design
Kim, Young Soo,Jang, Hong Sul,Youn, Heong Sik,Paik, Hong Yul 대한원격탐사학회 2001 International Symposium on Remote Sensing Vol.17 No.1
MSC (Multi-Spectral Camera) is an electro-optical camera, the payload of the KOMPSAT-2 spacecraft to be launched in 2004. MSC is designed to take high-resolution images of the Earth by using panchromatic and multispectral detectors in the visual and near IR spectral ranges. To estimate the system performance of the MSC, MTF (Modulation Transfer Function) and SNR (Signal to Noise Ratio) are assessed, which are widely used to define the performances of electro-optical imaging system. For the system MTF calculation, optics, detector, spacecraft, and orbital environment were considered. The optics MTF includes design, manufacturing, assembly, and environment effects. The detector MTF came from the measured value by the CCD manufacturer, and the spacecraft MTF is derived from fitter and smearing effects of the KOMPSAT-2. The movement effect and the synchronization effect on the orbit are also included, which are regarded as the orbital environment effect. To calculate system SNR, the signal from simulated Korean atmosphere, system MTF, optical transmittance, and electronic noise of the MSC were taken into account. The analysis results of the MTF and SNR are presented, and the results were discussed.
Integrated Ray Tracing Model for In-Orbit Optical Performance Simulation for GOCI
Ham, Sun-Jeong,Lee, Jae-Min,Kim, Seong-Hui,Youn, Heong-Sik,Kang, Gm-Sil,Myung, Hwan-Chun,Kim, Sug-Whan 통신위성우주산업연구회 2006 Joint Conference on Satellite Communications Vol.2006 No.-
GOCI (Geostationary Ocean Color Imager) is one of the three COMS payloads that KARl is currently developing and scheduled to be in operation from around 2008. Its primary objective is to monitor the Korean coastal water environmental condition. We report the current progress in development of the integrated optical model as one of the key analysis tools for the GOCI in-orbit performance verification. The model includes the Sun as the emitting light source. The curved Earth surface section of 2500 km x 2500 km including the Korean peninsular is defined as a Lambertian scattering surface consisted of land and sea surfaces. From its geostationary orbit, the GOCI optical system observes the reflected light from the surfaces with varying reflectance representing the changes in its environmental conditions. The optical ray tracing technique was used to demonstrate the GOCI in-orbit performances such as red tide detection. The computational concept, simulation results and its implications to the on-going development of GOCI are presented.