• Current Industrial and Technological Trends in Aerospace
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• v.4 no.1
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• pp.25-33
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• 2006

대한민국의 다목적 실용위성(아리랑 2호, KOMPSAT 2)가 2006년 7월 28일 금요일 러시아 플레체스크 우주발사장에서 발사되었다. 대한민국에서는 그동안 우리별 위성 시리즈, 과학위성 시리즈, 무궁화 위성 시리즈, 다목적 위성 시리즈, 과학 로켓 시리즈 및 우주발사체(KSLV-1)를 개발했거나 개발 중이다. 이러한 과정은 국가우주개발중장기 기본계획에 의하여 진행되고 있는데, 원하는 기간 내에 합리적 비용으로 목표를 이루고자하는 상황에서 우리가 본 받을만한 국가를 선정하여 모델로 삼는 것이 타당할 것이다. 이러한 필요 가운데 비교적 벤치마킹 대상으로 삼을만한 국가로 이스라엘이 부상하고 있다. 따라서 본 논문에서는 비교적 잘 알려지지 않았지만 우리가 벤치마킹의 대상으로 고려하는 이스라엘의 우주개발 역사를 살펴봄으로써, 우리나라의 우주개발 분야에 참고가 되고자 한다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.44 no.4
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• pp.352-362
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• 2016

In this paper, a disposal maneuver which complies the space debris mitigation guideline was analysed for KOMPSAT-2 as an example of LEO satellite. Definition of disposal altitude which comply the '25 year rule', re-entry survivability analysis of KOMPSAT-2 parts inside and casualty area analysis were performed using STK and ESA's DRAMA. Finally, assuming that there were several survival objects during uncontrolled re-entry stage, the re-entry initial orbit elements which show the low casualty probability were found even if there were various uncertainties about the initial orbit. As a result, KOMPSAT-2 should be descended its altitude at least 43km or up to 105km to comply '25 year rule' and there were heavy or heat resistant survival objects which generated $4.3141m^2$ casualty area. And if RAAN of re-entry initial orbit was 129 degree, total casualty probability was lower than standard value of space debris mitigation guideline even if there were uncertainties about the initial orbit.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.31 no.6_1
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• pp.455-461
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• 2013

Kompsat-3 is an optical high-resolution earth observation satellite launched in May 2012. The AEISS sensor of the Korean satellite provides 0.7m panchromatic and 2.8m multi-spectral images with 16.8km swath width from the sun-synchronous near-circular orbit of 685km altitude. Kompsat-3 is more advanced than Kompsat-2 and the improvements include better agility such as in-track stereo acquisition capability. This study investigated the characteristic of the epipolar curves of in-track Kompsat-3 stereo images. To this end we used the RPCs(Rational Polynomial Coefficients) to derive the epipolar curves over the entire image area and found out that the third order polynomial equation is required to model the curves. In addition, we could observe two different groups of curve patterns due to the dual CCDs of AEISS sensor. From the experiment we concluded that the third order polynomial-based RPCs update is required to minimize the sample direction image distortion. Finally we carried out the experiment on the epipolar resampling and the result showed the third order polynomial image transformation produced less than 0.7 pixels level of y-parallax.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.7
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• pp.92-97
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• 2005

In this paper, the performance of the KOMPSAT-1 GPS receiver on orbit was analyzed. OD (Orbit Determination) accuracy using GPS navigation solutions and GPS visibility were investigated with respect to the configuration of the GPS receiver. Indeed, the problem such as ‘3D Fix Loss’ observed during the mission was presented. As a result, the OD accuracy of ‘Best-of-4’ Position Fix Algorithm with 0 degree of mask angle was slightly better than that of ‘N-in-View’ Position Fix Algorithm. On the other hand, the GPS visibility under ‘N-in-View’ Algorithm is better than that of ‘Best-of-4’ Algorithm. The occurrence of temporal 3D Fix Loss is reduced when the ‘N-in-View’ Position Fix Algorithm was selected.

• Aerospace Engineering and Technology
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• v.2 no.2
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• pp.58-65
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• 2003

KARI Electrical Test Team performed the SOH (State Of Health) test and Thermal Cycling test for small satellite of KOMPSAT-1 PFM at KARI SITC Highbay as per Storage plan every year, and verified that the system/subsystem units function installed on PFM were good without significant degradation causing from long-term storage. This paper describes the test items, test method, test procedure and selected test result data.

• Aerospace Engineering and Technology
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• v.3 no.2
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• pp.7-10
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• 2004

KOMPSAT-2 needs fine accuracy attitude control when it is operated in Science mode. Reaction Wheel is a necessary part of fine controlling the attitude of satellite. The reaction Wheel Assembly(RWA) is a device which provides reaction torque for attitude-control of spacecraft. It consists of an electric motor, a rotating flywheel, motor control device electrics, commutation electronics and associated power converters. This document identifies what activities to be carried out to integrate the RW#1 for ETB tests.

• Aerospace Engineering and Technology
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• v.1 no.1
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• pp.42-54
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• 2002

In December of 1997, Korea Aerospace Research Institute begin to develope the conceptual design of Kompsat2 as the Kompsat1 design is nearly completed. Basic direction of this design was set up to utilized the heritage of Kompsat1 and modify the payload module to accommodate the new high resolution space borne camera. And in the early stage of this design, total system configuration design study was conducted based on 1st level payload information. In this paper, mechanical system design at various stage is documented and this will be used as a path finder or guidelines in the future feasibility study or conceptual design.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.06a
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• pp.23-24
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• 2009

허베이스피리트호 원유유출 사고는 2007년 12월7일 아침 7시6분경 서해안 만리포 북서쪽 10km 해상에서 크레인을 적재한 1만1800t급 바지선이 정박 중인 홍콩 선적 유조선 허베이 스피리트호(14만6000t급)와 부딪치면서 발생했다. 이와 같은 기름 유출 사고의 경우, 유출 범위를 정확하게 이해하는 것이 중요하다. 여기서는 위 사고 기간에 얻어진 인공위성 자료를 이용하여 기름 유출을 탐지하기 위한 연구결과를 소개한다. 광학과 마이크로파데이터에 대해 유출 범위의 계산 및 해석 알고리듬에 대한 현재까지의 결과를 소개한다. 광학데이터로는 아리랑 2호(다목적실용위성 2호, KOMPSAT II)) MSC(Multi Spectral Camera)자료가 사용되었으며, 합성개구레이더로는 ENVISAT ASAR, TerraSAR-X 및 ALOS PALSAR의 자료가 사용되었다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.29 no.4
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• pp.405-411
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• 2011

In this study we tried to compare and analyze KOMPSAT-2 NOVI and vegetation coverage(VC) which is investigated by fieldwork. To standardize KOMPSAT-2 NOVI, we adjusted NOVI using reference data which is atmospheric corrected MODIS NDVI. Each vegetation coverage point data was surveyed in field using portable GPS and compared with NDVI of satellite imagery. As a results, there was high level of correlation in vegetation coverage and NOVI.

• Proceedings of KOSOMES biannual meeting
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• 2008.05a
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• pp.125-127
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• 2008

허베이스피리트호 원유유출 사고는 2007년 12월7일 아침 7시6분경 서해안 만리포 북서쪽 10km 해상에서 크레인을 적재한 1만1800t급 바지선이 정박 중인 흥콩 선적 유조선 허베이 스피리트호(14만6000t급)와 부딪치면서 발생했다. 이와 같은 기름 유출 사고의 경우, 유출 범위를 정확하게 이해하는 것이 중요하다. 여기서는 위 사고 기간에 얻어진 인공위성 자료를 이용하여 기름 유출을 탐지하기 위한 연구결과를 소개한다. 광학과 마이로파영상에 대해 유출 범위의 계산 및 해석 알고리듬에 대한 현재까지의 결과를 소개한다. 광학영상으로는 아리랑 2호 (다목적 실용위성 2호, KOMPSAT II) MSC(Multi Spectral Camera)자료가 사용되었으며, 합성개구레이더로는 ENVISAT ASAR, TerraSAR-X 및 ALOS PALSAR의 자료가 사용되었다.