• 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.

• 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.

• 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.

• 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.

• Journal of Satellite, Information and Communications
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• v.3 no.2
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• pp.43-47
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• 2008

COMS is the one of Korean hybrid geostationary satellite and is scheduled to be launched in 2009 by Arian V into $128^{\circ}$ E longitude. COMS is designed and manufactured for three main objectives which are Communications, Oceanographic, and Meteorological missions. It provides the weather monitoring, ocean monitoring, and Ka band satellite communication services by means of three different payloads. The Ka band communications payload was developed by Electronics and Telecommunications Research Institute (ETRI), and provides not only the digital transmission for the communication services against natural disaster but also digital transmission for the high speed multimedia services. This paper describes the overview of the electrical and mechanical design and measured performances of the Ka band communications transponder flight model (FM) for COMS.

• Journal of Satellite, Information and Communications
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• v.5 no.2
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• pp.19-24
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• 2010

The COMS (Communication Ocean Meteorological Satellite) is a hybrid geostationary satellite including communication, ocean, and meteorological payloads. The COMS includes the MODCS (Meteorological and Ocean Data Communication Subsystem) which provides transmitting the raw data collected by meteorological payload called MI (Meteorological Imager) and ocean payload named GOCI (Geostationary Ocean Color Imager) to the ground station, and relaying the meteorological data processed on the ground to the end-user stations. Here, for the L-band transmit antenna transmitting SD (Sensor Data) signal and the processed signal, from the system point of view, it is required to estimate the combined antenna gain when the L-band transmit is placed with MI and GOCI payloads on the earth panel of COMS. First of all, the L-band transmit horn is designed and analyzed for the requirements given, and then after placing it on the earth panel, the combined gain analysis is performed using three different analysis methods. It's shown that the obtained gain patterns are very similar among three different analysis methods. Finally the antenna gain degradation of less than 0.5 dB is estimated.

• Electronics and Telecommunications Trends
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• v.21 no.4 s.100
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• pp.107-117
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• 2006

위성 탑재체 제조 산업은 기초 과학이 뒷받침된 초정밀 기계 공학, 첨단 전자 기술, 극한 환경 기술 및 신소재 공학 등과 같은 첨단 산업의 집합체라 할 수 있다. 현재 미국을 비롯한 서구 선진국에서 진행중인 탑재체 기술동향을 보면, 폭발적으로 증가하는 위성수에 따라 위성 궤도가 부족하고 주파수 자원이 고갈되고 있는 상황에서 통신 위성의 효율성과 성능을 향상시킬 수 있는 신호처리 탑재(OBP) 위성과 통신기능을 포함한 다양한 기능을 가진 복합위성 개발이 진행되고 있으며 주파수 대역의 포화와 광대역 멀티미디어 서비스 제공 등을 위해 보다 높은 주파수의 준 밀리미터파 대역(Ka 대역) 위성 개발이 활발히 이루어지고 있다. 국내에서는 현재, 2008년 발사를 목표로 마이크로스위치 매트릭스(MSM)가 탑재되어 빔간 스위칭이 가능하도록 설계된 통신해양기상위성(COMS)용 통신 탑재체(SACOM) 개발이 진행중이다. 국내의 위성탑재용 RF 부품분야는 1990년부터 위성 중계기 시스템의 기본적인 설계, 조립, 종합화, 시험기술을 바탕으로 통신위성 탑재체용 초고주파 부품을 개발하여 왔으며, 2000년대에는 Ku 대역(12/14GHz) 및 Ka 대역(20/30GHz) 기술인증모델(EQM) RF 부품을 성공적으로 개발하였다. 이를 바탕으로 통신해양기상위성 통신탑재체용 Ka 대역 RF 부품이 현재 우주인증 모델(QM)의 개발이 완료되었으며 비행 모델(FM) 개발이 진행중이다.

• Journal of Satellite, Information and Communications
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• v.8 no.1
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• pp.89-100
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• 2013

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 $128.2^{\circ}$ 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 functionalities and the performances 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 operation characteristics of meteorological mission and ocean mission are described and the mission planning for the COMS is discussed. The mission operation results during the COMS IOT are analyzed through statistical approach for the study of both the mission operation capability of COMS verified during the IOT and the satellite image reception capacity achieved during the IOT.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.3
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• pp.3-16
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• 2011

천리안 위성은 4개 정부 부처 공동 사업으로, 통신 서비스, 해양 기상 관측 서비스 제공을 목적으로 개발된 복합 위성으로, 그중 통신 서비스를 담당하는 통신 탑재체는 방송통신위원회 출연으로 한국전자통신연구원(ETRI)가 주관, 개발하여 성공한 순수 국산 개발품으로, 위성 발사 성공 후 시험 검증을 거쳐 현재 정상 운용 중에 있다. 우주 인증 획득을 목적으로 개발한 통신 탑재체는 위성 스위칭 중계기와 다중 빔 안테나로 구성되었으며, 구성 부품들인 능동 부품과 수동 부품들은 대부분 국내 연구진에 의해 설계, 제작 시험 검증되어 중계기 및 안테나 시스템 종합화, 통신 탑재체 및 위성체 우주 환경 시험을 성공적으로 수행되었다. 위성 발사 성공 후에, 정지 궤도상에서의 통신 탑재체 궤도내 시험을 완료를 통해 순수국산 개발된 통신 탑재체의 설계 제작 기술에 대한 정지 궤도 우주환경에서도 정상 동작됨을 입증하였다. 통신 탑재체는 다양한 우주 조건에서의 다양한 기술 확보와 차세대 멀티미디어 위성 서비스 개발에 활용하고자 한다. 본 논문은 통해기 통신 탑재체 설계 제작 시험 기술을 소개하고, 활용 계획에 대해 언급하고자 한다.

• Journal of Satellite, Information and Communications
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• v.1 no.2
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• pp.25-31
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• 2006

The COMS (Communication, Ocean, and Meteorological Satellite) performing meteorological and ocean monitoring and providing communication service with meteorological, ocean and Ka-band payload in the geostationary orbit includes MODCS (Meteorological and Ocean Data Communication Subsystem) which provides transmitting the raw data collected by meteorological payload called MI (Meteorological Imager) and ocean payload named GOCI (Geostationary Ocean Color Imager) to the ground station and relaying the meteorological data processed on the ground to the end-user stations. MODCS comprises of two channels: SD channel which formats the raw data according to CCSDS recommendation, amplifies and transmits its signal to the ground station; MPDR channel which relays to the end-user stations the ground-processed meteorological data in the data format of LRIT/HRIT recommended by CGMS. This paper constructs the architecture of MODCS for transmitting and relating the observed data, and investigates that the key performance parameters have the required margin through the preliminary performance analyses.