• 제목/요약/키워드: communication ocean and meteorological satellite (COMS)

검색결과 198건 처리시간 0.03초

천리안 위성을 활용한 위성 통신용 공공 테스트베드 운용에 관한 연구 (A Study of Public Test-bed Operation for Satellite Communications via COMS)

  • 왕도휘;오덕길
    • 한국위성정보통신학회논문지
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    • 제8권4호
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    • pp.12-16
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    • 2013
  • 본 논문에서는 현재 운용중인 천리안 위성을 활용한 위성 통신용 공공 테스트베드 시스템 구성 및 서비스 이용 현황에 대해 소개하고자 한다. 공공 시범 서비스 운용을 통해 차세대 VSAT 서비스 제공 시 Ka 대역의 활용도가 높아짐에 따른 광대역 멀티미디어 서비스가 가능할 것으로 된다. 또한, 향후 위성을 통한 UHD 방송을 통해 방송서비스의 보편적 접근성 향상을 예상해 본다.

위성의 전이궤도 열해석 (TRANSFER ORBIT THERMAL ANALYSIS FOR SATELLITE)

  • 전형열;김정훈;김성훈;양군호
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2007년도 추계 학술대회논문집
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    • pp.227-231
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    • 2007
  • COMS (Communication, Ocean and Meteorological Satellite) is a geostationary satellite and has been developing by KARI for communication and ocean and meteorological observations. It will be launched by ARIANE 5. Ka-band components are installed on South panel, where single solar array wing is mounted. Radiators, embedded heat pipes, external heat pipe, insulation blankets and heaters are utilized for the thermal control of the satellite. The Ka-band payload section is divided several areas based on unit operating temperature in order to optimize radiator area and maximize heat rejection capability. Other equipment for sensors and bus are installed on North panel. The ocean and meteorological sensors are installed on optical benches on the top floor to decouple thermally from the satellite. During the transfer orbit operation, satellite will be under severe thermal environments due to low dissipation of components, satellite attitudes and LAE(Liquid Apogee Engine) firing. This paper presents temperature and heater power prediction and validation of thermal control design during transfer orbit operation.

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ELECTRICAL INTERFACES COMPATIBILITY ANALYSIS FOR THE COMS AOCS

  • Koo, Jae-Chun;Kim, Eui-Chan
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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    • pp.183-186
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    • 2007
  • The aim of this analysis is to verify the electrical compatibility of the interfaces which exist between COMS(Communication, Ocean and Meteorological Satellite) AOCS(Attitude Orbit Control Subsystem) equipments and external equipments. For each interface, this study checked the compatibility between equipments for the power links, commands, digital telemetry, analog telemetry and failure condition. In addition with this interface compatibility verification, this study outputs the electrical and manufacturing constraints to be applied at harness level.

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정지궤도위성과 발사체와의 전자파 적합성 해석 (Preliminary EMC Analysis between the COMS and the Arian V Launch Vehicles)

  • 김의찬;이흥호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 제39회 하계학술대회
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    • pp.1403-1405
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    • 2008
  • In this paper, the preliminary EMC analysis process between the Communication, Ocean and Meteorological Satellite (COMS) and Geostationary Earth Orbit (GEO) launch vehicles in the frequency range [1MHz-47MHz] is described. The considered launch vehicle is the Arian V. The launch vehicle Radiated Emission (RE) specifications have been compared to COMS satellite Radiated Susceptibility (RS) limits. The COMS RS limits are the RS qualification levels of COMS units during launch. As a result, The radiated emission levels of the Arian V is compliant with COMS RS limits.

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Orbit Determination Accuracy Improvement for Geostationary Satellite with Single Station Antenna Tracking Data

  • Hwang, Yoo-La;Lee, Byoung-Sun;Kim, Hae-Yeon;Kim, Hae-Dong;Kim, Jae-Hoon
    • ETRI Journal
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    • 제30권6호
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    • pp.774-782
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    • 2008
  • An operational orbit determination (OD) and prediction system for the geostationary Communication, Ocean, and Meteorological Satellite (COMS) mission requires accurate satellite positioning knowledge to accomplish image navigation registration on the ground. Ranging and tracking data from a single ground station is used for COMS OD in normal operation. However, the orbital longitude of the COMS is so close to that of satellite tracking sites that geometric singularity affects observability. A method to solve the azimuth bias of a single station in singularity is to periodically apply an estimated azimuth bias using the ranging and tracking data of two stations. Velocity increments of a wheel off-loading maneuver which is performed twice a day are fixed by planned values without considering maneuver efficiency during OD. Using only single-station data with the correction of the azimuth bias, OD can achieve three-sigma position accuracy on the order of 1.5 km root-sum-square.

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동북아시아 지역에서 MODIS와 MI에 의한 에어로졸 광학두께 비교 (Comparison of Aerosol Optical Thicknesses by MODIS and MI in Northeast Asia)

  • 김은규;이규태;정명재
    • 대한원격탐사학회지
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    • 제33권5_1호
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    • pp.607-615
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    • 2017
  • 본 연구에서는 동북아시아($15{\sim}55^{\circ}E$, $90{\sim}150^{\circ}N$) 영역에 대하여 극궤도 위성 Terra와 Aqua에 탑재된 Moderate Resolution Imaging Spectrometer (MODIS) 센서와 우리나라 정지궤도 위성인 통신해양기상위성(Communication, Ocean and Meteorological Satellite, COMS)에 탑재된 Meteorological Imager (MI) 센서에 의한 에어로졸 광학두께(AOT) 산출 결과와 지상의 Aerosol Robotic Network (AERONET) 관측 자료를 비교 분석하였다. 그 결과 MODIS와 MI에 의한 에어로졸 광학두께는 해양에서 비교적 잘 일치하였으나 구름 가장자리와 육지에서는 두 센서의 에어로졸 광학두께 차이가 크게 나타났다. 그 이유로서 MODIS는 가시 채널과 적외 채널을 혼용하는 반면 MI는 오직 가시채널 만 사용하기 때문에 구름 가장자리의 옅은 구름을 에어로졸로 인식할 수 있고 육지에서는 지표면 특성에 따라 MODIS와 MI에 의한 에어로졸 광학두께 산출 차이가 발생된다. 따라서 MI 에어로졸 광학두께는 구름 가장자리와 지표면 특성의 영향을 주는 지표면 반사도의 정확성 개선을 통해 에어로졸 광학두께 산출 결과를 개선할 수 있다고 사료된다.

A DESIGN OF SMALL DATA UTILIZATION SYSTEM FORTHECOMS

  • Seo Seok-Bae;Ku In-Hoi;Kang Chi-Ho;Lirn Hyun-Su;Ahn Sang-IL
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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    • pp.268-271
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    • 2005
  • COMS (Communication, Ocean, and Meteorological Satellite) will be launch at end of year 2008. For receiving of COMS LRlT, KARl (Korea Aerospace Research Institute) finished design and software realization of COMS SDUS (Small Data Utilization System). SDUS is a small station receiving LRlT data for distribute satellite image, weather information, and so on. For the future project, KARl preparing COMS MDUS (Mass Data Utilization System) that can receiving large size of data over than 2M BPS (Bit Per Seconds) data size.

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Measurement of Peak-to-Average Power Ratio for HRIT

  • Park Durk-Jong;Yang Hyung-Mo;Ahn Sang-Il
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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    • pp.498-500
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    • 2004
  • QPSK (Quaternary Phase Shift Keying) will be adopted as the modulation of HRIT (High Rate Information Transmission) which is transmitted to COMS (Communication, Ocean and Meteorological Satellite) through HPA (High Power Amplifier) in ground segment. Due to the nonlinearity of HPA, IMD (Inter-Modulation Distortion) of multi-carrier signals and PAPR (Peak-to-Average Power Ratio) of modulated HRIT must be considered to estimate the output power of HPA. In this paper, we measured the PAPR to various the roll-off factor of RRC (Root Raised Cosine filter) which is filtering the modulated HRIT signal for reducing ISI (Inter-Symbol Interference) and bandwidth. It was found that the minimum PAPR is 2.78dB at 0.5 of roll-off factor for scrambled data. It's 2.78dB of P APR will be in output power selecting in COMS earth station.

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정지궤도 복합위성 국내외 개발 동향 (Trend of Domestic and International Development of Multi-Purpose Satellites of Geosynchronous Orbit)

  • 공현철;송병철;오범석
    • 항공우주산업기술동향
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    • 제6권2호
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    • pp.116-124
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    • 2008
  • 한국항공우주연구원이 개발하고 있는 통신해양기상위성은 2009년 6월경에 발사될 예정이다. 지구 자전속도와 같은 속도로 돌기 때문에 24시간 기상 및 해양관측과 통신서비스가 가능한 국내에서 개발되는 최초의 정지궤도위성이다. 2008년 11월에 프랑스에서 해양 탑재체가 들어옴으로써 세 가지 탑재체를 장착할 수 있게 되었고 그 후에는 우주환경시험 등을 거쳐서 프랑스령 기아나 우주센터에서 발사될 전망이다. 본 논문에서는 통신해양기상위성이 세계적으로도 첫 번째 정지궤도 복합위성이 되기 때문에 국내 및 세계적으로 정지궤도 복합위성과 관련된 개발 동향을 살펴보고자 한다.

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