• Bulletin of the Korean Space Science Society
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• 2003.10a
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• pp.99-99
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• 2003

우리나라 최초의 실용급 지구관측위성인 아리랑 1호는 지난 2003년 2월 21일부로 목표로 하였던 임무운영기간 3년을 완수하였다. 아리랑 1호의 정상 임무운영에 사용되는 탑재체는 전장광학카메라, 해양관측카메라, 그리고 우주과학 탑재체이며, 2001년 8월 원인을 알 수 없는 과전류 발생으로 임무가 중단된 우주과학 탑재체를 .제외한 나머지 탑재체들은 임무 운영기간동안 정상적으로 운영되었다. 전자광학카메라는 한반도를 비롯한 전 세계를 대상으로 지리정보를 위한 영상자료를 획득하는 것이 목적이었으며, 해양관측카메라는 생물학적 해양지도 및 해양환경 관측을 위한 자료를 획득하는 것이다. 우주과학 탑재체는 고에너지 전하입자에 의한 Single Event Upset현상, 우주방사능 관측, 그리고 전자의 온도 및 밀도 측정이 주요 목표였다. 당초 목표했던 임무운영기간을 초과한 현재(2003년 7월 1일 기준)까지 우주과학 탑재체를 제외한 나머지 탑재체들은 정상적으로 운영되고 있다. 본 논문은 아리랑 1호 발사 후 약 3년 6개월간의 기간동안 수행된 탑재체 운영결과들을 정리하였다.

• Aerospace Engineering and Technology
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• v.8 no.2
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• pp.1-7
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• 2009

The Geostationary Ocean Color Imager (GOCI) is under development to provide a monitoring of ocean-color around the Korean Peninsula from geostationary platforms. It is planned to be loaded on Communication, Ocean, and Meteorological Satellite (COMS) of Korea. In this study, the radiometric model of GOCI, which is constructed based on the functional model of sub-system, is introduced. Non-linearity for each channel is analyzed in terms of linear gain and nonlinear gain by using the radiometric model. The non-linearity characteristic is validated by using test data which have been achieved during ground test at payload level. The non-linearity $G^3$/b shows identical characteristic for all channels.

• Korean Journal of Remote Sensing
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• v.22 no.6
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• pp.595-600
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• 2006

GOCI is the core paryload of the geostationary satellite COMS(Communication, Ocean and Meteological Satellite) for ocean monitoring. It is scheduled to be launched at the end of 2008. GOCI observes ocean color around the Korean Peninsula over $2500km\times2500km$ area. It used tilted two-axis scan mechanism to observe entire field of view. In this work, the pointing stability of the tilted two-axis method is analyzed and compared with that of gimbal method. The analysis results show that tilted two-axis method gives great stability and it is adequate for geostationary payload. The results can also be used to determine and analyze the mechanism specifications.

• Journal of Satellite, Information and Communications
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• v.1 no.2
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• pp.38-44
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• 2006

The COMS(Communication, Ocean & Meteorological Satellite) is the geostationary satellite which will be performing three main objectives such as meteorological service, ocean monitoring and Ka-band satellite communications. In order to accomplish these missions, the COMS system needs to implement a specific electrical/mechanical interface functions which are requested by each payload units. This paper describes a on-board interface hardware design for COMS Meteorological Imager(MI). The Meteorological Imager Interface Unit(MI2U) achieves, through MIL-STD-15533 system bus, the interface between the Spacecraft Computer Unit(SCU) and the instrument which is dedicated to MI. MI2U provides a necessary power input to MI from +50V Power Supply Regulator(PSR), and allows adaptation of the specific payload interfaces and protocol to COMS spacecraft.

• Aerospace Engineering and Technology
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• v.10 no.1
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• pp.156-166
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• 2011

COMS (Communication Ocean and Meteorological Satellite), the Korea's first geostationary Earth observation satellite, started to operate 24 hours to observe Land/Ocean/Atmosphere with the MI (Meteorological Imager) and GOCI (Geostationary Ocean Color Imager). After the successful completion of the IOT (In-Orbit Test), the satellite is in normal operation from April of 2011. This paper describes an algorithm for scan mirror emissivity compensation of the COMS MI and its software implementation.

• Aerospace Engineering and Technology
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• v.6 no.2
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• pp.87-95
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• 2007

The ocean and meteorological payloads of COMS are concerned to experience degration of image quality due to the disturbance induced by the motion of moving parts of the payloads. And thruster firings for stationkeeping and wheel offloading are expected to degrade the image quality of the optical payloads. In case of COMS, in order to keep the optical payload free from the mechanical interference from the other payload, the operation design approach has been taken. This paper introduces the operation design of COMS taken to avoid these problems. In order to meet users requirement by avoiding the degradation of image quality, the timeline of optical payloads and housekeeping are optimized, and operational constraints are applied to the mirror motion of the meteorological payload. This paper also introduces the results of time budget analysis performed to validate the operation design.

• Journal of Satellite, Information and Communications
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• v.5 no.1
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• pp.69-74
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• 2010

As a part of development process of the COMS, an acoustic vibration test was performed in order to verify that the COMS is safe from the acoustic loads coming from the Ariane-5ECA launch vehicle when it is launched. In this paper, the acoustic vibration test preparation which was performed during the development of the COMS is explained, and through the evaluation of the test results, it was verified whether the COMS is safe from the acoustic load that the COMS will experience during the launch. Through detail evaluation of the acoustic loads on the solar array, Ka band communication payload antenna and feed, GOCI(Geo-Stationary Ocean Color Imager), MI(Meteorological Imager), it was confirmed that the COMS is safe from the acoustic loads from launch vehicle.

• Aerospace Engineering and Technology
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• v.7 no.1
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• pp.99-107
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• 2008

The COMS is a kind of geostationary multi-functional satellites with three different mission objectives. Two of them aim at earth observation and the COMS has two optical payloads according to those missions. The payloads are composed of a meteo imager and an ocean color imager, and their inherent characteristics require optimal interface design for their performance to be concurrently achieved. Therefore, various kinds of constraints are considered in their component accommodation on the COMS platform. This paper shows a general overview of the optical payload accommodation design and describes the design consideration to achieve the optimized performance from thermal and mechanical point of view.

• Korean Journal of Remote Sensing
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• v.26 no.2
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• pp.167-173
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• 2010

This paper introduces Geostationary Ocean Color Imager, IMage Pre-processing Subsystem (GOCI IMPS) of Communication, Ocean, and Meteorological Satellite (COMS), and describes its functions, development states, and operational concepts. The primary and backup systems of GOCI IMPS have been installed in Korea Ocean Satellite Center (KOSC) and Satellite Operation Center (SOC) and the system are the prelaunch test phase after completing all required tests. It is expected that the GOCI data observed continuously over the Korea Peninsular in the geostationary orbit will be usefully utilized in marine environment research fields such as sea surface temperature changes or marine ecosystems.

• Satellite Communications and Space Industry
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• v.13 no.1 s.28
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• pp.72-80
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• 2006

통신해양기상위성은 기상관측, 해양관측 및 통신방송의 3가지 임무를 수행하는 정지궤도 복합임무 위성이다. 위성본체는 기존의 화성탐사선(Mars Express) 위성의 구조를 확장하여 새로 개발한 구조체에 기존의 E3000 통신위성 버스에 사용하였던 전기전자 부품 및 추진계를 사용한다. 3축제어 위성으로서 태양전지판은 한 쪽에만 부착되어 있으며, 반대쪽에는 종래의 기상위성이 모멘트 균형을 위하여 갖고 있었던 솔라세일(solar sail)을 갖고 있지 않다. 기상탑재체는 미국의 아이티티(ITT)가 제작 공급하고, 해양탑재체는 이에이디에스 아스트리움(EADS Astrium)사와 항공우주연구원이 공동으로 개발하며, 통신 탑재체는 전자통신연구원에서 개발한다. 지상국은 항공우주연구원이, 관제시스템은 전자통신연구원이 개발을 담당하고 있다. 개발의 전 과정이 해외협력 개발로 이루어진다. 설계는 프랑스의 뚤르즈 소재 이에이디에스 아스트리움(EADS Astrium)사에서 한국 기술진의 참여 하에 이루어지며, 조립 및 시험은 항공우주연구원의 시설을 이용하여 한국에서 이루어진다. 발사준비도 공동으로 수행하고, 발사 후 전이궤도운영은 아스트리움사의 지상국을 사용하여 수행하여 목표궤도에 진입시킨 후 항공우주연구원의 지상국에서 궤도 내 시험(in-orbit-test)를 완료한 후 위성을 인도 받는다.