• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1197-1199
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• 2003

ROCSAT-2 mission is to daily image over Taiwan and the surrounding area for disaster monitoring, land use, and ocean surveillance during the 5-year mission lifetime. The satellite will be launched in December 2003 into its mission orbit, which is selected as a 14 rev/day repetitive Sun-synchronous orbit descending over (120 deg E, 24 deg N) and 9:45 a.m. over the equator with the minimum eccentricity. National Space Program Office (NSPO) is developing a ROCSAT-2 Image Processing System (IPS), which aims to provide real-time high quality image data for ROCSAT-2 mission. A simulated ROCSAT-2 image, based on Level 1B QuickBird Data, is generated for IPS verification. The test image is comprised of one panchromatic data and four multispectral data. The qualification process consists of four procedures: (a) QuickBird image processing, (b) generation of simulated ROCSAT-2 image in Generic Raw Level Data (GERALD) format, (c) ROCSAT-2 image processing, and (d) geometric error analysis. QuickBird standard photogrammetric parameters of a camera that models the imaging and optical system is used to calculate the latitude and longitude of each line and sample. The backward (inverse model) approach is applied to find the relationship between geodetic coordinate system (latitude, longitude) and image coordinate system (line, sample). The bilinear resampling method is used to generate the test image. Ground control points are used to evaluate the error for data processing. The data processing contains various coordinate system transformations using attitude quaternion and orbit elements. Through the qualification test process, it is verified that the IPS is capable of handling high-resolution image data with the accuracy of Level 2 processing within 500 m.

• 자원환경지질
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• 제45권4호
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• pp.377-384
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• 2012

다목적위성인 아리랑 2호 (KOMPSAT-II)에 장착된 위성의 자세제어를 위한 삼축자력계(Triaxial Magnetometer, TAM)에서 측정된 지구자기장의 삼성분 자료로부터 지구 외핵에서부터 오는 주지구자기장 (main geomagnetic field)의 모델을 계산하였다. 일반적으로 지자기 표준모델이라고도 일컫는 IGRF(International Geomagnetic Reference Model)과의 비교를 통해 제작된 모델과의 상관성을 연구하였다. 선행연구에서는 KOMPSAT-I의 3일 자료만을 통해 제작한 것과 달리 2007년 11월과 12월 자료를 항공우주연구원의 협조를 받아 모델에 활용하였다. 선행 연구에서는 구면조화 함수의 차수가 5까지의 유사성을 보인 반면 이번에 얻은 모델은 차수 8-9까지 유사성을 보이며 그 이후 차수 13까지 계산에서는 국제표준모델과 많은 차이를 나타내었다. KOMPSAT-II 자료를 통한 지구자기장 모델을 제작하는 데 있어서 적절한 자료선별과정과 이와 관련된 극지방자료의 포함여부와 외부자기장성분의 적절한 제거 및 위성에 탑재한 측정자력계의 정확도가 국제지자기표준모델과의 유사성 여부에 중요한 요소로 작용하였다. 수년간의 자료입수가 가능할 경우 지구자기장의 영년변화연구에도 지상의 지자기관측소자료와 함께 KOMPSAT-II 자료의 활용이 기대된다.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2008년도 한국우주과학회보 제17권2호
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• pp.27.1-27.1
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• 2008

KASI (Korea Astronomy and Space Science Institute) is developing a compact wide-field survey space telescope system, MIRIS (The Multi-purpose IR Imaging System) to be launched in 2010 as the main payload of the Korea Science and Technology Satellite 3. Through recent System Design Review (SDR) and Preliminary Design Review (PDR), most of the system design concept was reviewed and confirmed. The near IR imaging system adopted short F/2 optics for wide field low resolution observation at wavelength band 0.9~2.0 um minimizing the effect of attitude control system. The mechanical system is composed of a cover, baffle, optics, and detector system using a $256\times256$ Teledyne PICNIC FPA providing a $3.67\times3.67$ degree field of view with a pixel scale of 51.6 arcsec. We designed a support system to minimize heat transfer with Muti-Layer Insulation. The electronics of the MIRIS system is composed of 7 boards including DSP, control, SCIF. Particular attention is being paid to develop mission operation scenario for space observation to minimize IR background radiation from the Earth and Sun. The scientific purpose of MIRIS is to survey the Galactic plane in the emission line of Pa$\alpha$ ($1.88{\mu}m$) and to detect the cosmic infrared background (CIB) radiation. The CIB is being suspected to be originated from the first generation stars of the Universe and we will test this hypothesis by comparing the fluctuations in I (0.9~1.2 um) and H (1.2~2.0 um) bands to search the red shifted Lyman cutoff signature.