• 제목/요약/키워드: solar space mission

검색결과 97건 처리시간 0.028초

인공위성 탑재용 극자외선 태양망원경(EUVT) EM 개발 (DEVELOPMENT OF THE SOLAR EUV TELESCOPE ENGINEERING MODEL FOR A SATELLITE)

  • 이선민;장민환;이은석
    • Journal of Astronomy and Space Sciences
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    • 제20권4호
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    • pp.327-338
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    • 2003
  • 본 논문은 인공위성에 탑재될 것을 감안한 극자외선 태양망원경의 제작을 통한 연구 결과를 기술한다. 극자외선은 지상에서는 관측되지 않는 영역으로 인공위성이나 로켓 등에 탑재되어 관측하게 된다. 본 연구의 극자외선 태양망원경(EUVT; Extreme-Ultra-Violet solar Telescope)의 설계는 '인공위성 탑재용 극자외선 태양망원경 공학모형 설계'(한정훈 등 2001)를 기반으로 인공위성에 탑재할 만한 크기와 위성 입력전압에 따른 전자부 설계 등 기본적인 요구사항에 맞추었으며, 특히 EVUT의 관측 파장대인 58.4㎚에서 62.9㎚의 검출 가능성에 중점을 두었다. 본 논문에서는 부경으로 인한 차폐율을 줄이기 위한 광학계 설계 변경과 공학모형(Engineering Model)을 제작하는데 사용된 검출기와 광학 기술에 대해 논의한다. 또한, EUVT의 검출기가 받는 태양 복사량을 산출하기 위한 검출효율 프로그램과 차후 관측 자료 처리에 대해 기술한다.

실 궤도면 누적량 계산법을 활용한 원자산소의 저궤도위성 태양전지판 코팅재료 침식량 예측 (Prediction of Atomic Oxygen Erosion for Coating Material of LEO Satellite's Solar Array by Using the Real Ram Direction Accumulation Method)

  • 김유광;이상택;백명진;이석훈
    • 항공우주시스템공학회지
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    • 제11권5호
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    • pp.1-5
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    • 2017
  • 본 논문은 실 궤도면 누적량 계산법을 활용한 원자산소의 저궤도위성의 태양전지판 코팅재료 침식량에 대한 예측 연구로써, 기존 프로젝트에서 활용하던 최악 경우 추정법과 상호 비교를 통해 원자산소 영향성의 차이가 있음을 확인하였으며, 이렇게 예측된 결과를 바탕으로 해외 제작사의 설계입증 자료 확인시 활용할 예정이다. 가상으로 설정한 궤도정보를 바탕으로 한 계산은 유럽우주기구(ESA)가 제공하고 있는 우주환경정보시스템을 이용하였고, 실제 궤도상에서의 태양전지판에 충돌되는 원자산소 플럭스를 계산하기 위해서 궤도 계산 소프트웨어를 활용하였다.

Study on Solar Constraint in the Operation of COMS Meteorological Imager

  • Cho Young-Min
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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    • pp.382-385
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    • 2004
  • Communication Ocean Meteorological Satellite (COMS) for the hybrid mission of meteorological observation, ocean monitoring, and telecommunication service is planned to be launched onto Geostationary Earth Orbit in 2008 according to the Korea national space program. A feasibility study on the solar constraint in the operation of the COMS meteorological imager (MI) is performed using the GOES imager hardware operation characteristics. The Earth observation areas of the MI are introduced and the observation time of the MI observation area is calculated. The sun light can enter into the MI optical system around the local midnight and impinge on the performance of the MI. The solar eclipse viewed from the satellite occurs near local midnight around the equinox. This study discusses the restriction of imaging operation time that should be considered in order to avoid the solar intrusion about local midnight and to keep acceptable image quality for the MI observation areas. This study could be useful to build the operation concept of the MI during the development of the MI.

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KOMPSAT SATELLITE LAUNCH AND DEPLOYMENT OPERATIONS

  • Baek, Myung-Jin;Chang, Young-Keun;Lee, Jin-Ho
    • Journal of Astronomy and Space Sciences
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    • 제16권2호
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    • pp.199-208
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    • 1999
  • In this paper, KOMPSAT satellite launch and deployment operations are discussed. The U.S. Taurus launch vehicle delivers KOMPSAT satellite into the mission orbit directly. Launch and deployment operations is monitored and controlled by several international ground stations including Korean Ground Station (KGS). After separation from launch vehicle, KOMPSAT spacecraft deploys solar array by on-board autonomous stored commands without ground inter-vention and stabilizes the satellite such that solar arrays point to the sun. Autonomous ground communication is designed for KOMPSAT for the early orbit ground contact. KOMPSAT space-craft has capability of handing contingency situation by on-board fault management design to retry deployment sequence.

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태양돛 기술 동향 (Status of the Solar Sail Technologies)

  • 조형순;김학인;이수용;노진호
    • 한국항공우주학회지
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    • 제42권6호
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    • pp.495-504
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    • 2014
  • 태양돛은 태양 광자들의 운동량 변화를 이용하여 추력을 얻는 우주선이다. 매우 작지만 연속적인 가속도를 얻을 수 있어 태양돛은 다양한 임무를 수행할 수 있다. 효과적인 임무개발을 위해서는 태양돛의 형상, 돛의 재료 그리고 전개 장치에 따른 구조/재료적 특성뿐만 아니라 위성의 임무 궤적에 따른 자세제어 방법들을 고려해야 한다. 본 논문에서는 태양돛의 기술발전, 태양돛 제작에 필요한 소요기술 그리고 태양돛을 이용한 향후 개발가능한 위성 임무에 대하여 살펴보고자 한다.

BITSE Preliminary Results

  • Bong, Su-Chan;Yang, Heesu;Lee, Jae-Ok;Kim, Yeon-Han;Cho, Kyung-Suk;Choi, Seonghwan;Baek, Ji-Hye;Park, Jongyeob;Kim, Jihun;Park, Young-Deuk;Kim, Rok-Soon;Lim, Eun-Kyung;Yashiro, Seiji;Makela, Pertti A.;Reginald, Nelson L.;Thakur, Neeharika;Gopalswamy, Natchimuthuk;Newmark, Jeffrey S.;Gong, Qian
    • 천문학회보
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    • 제46권1호
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    • pp.60.1-60.1
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    • 2021
  • The Balloon-borne Investigation of Temperature and Speed of Electrons in the corona (BITSE) is a technology demonstration mission launched in 2019 to observe the solar corona from ~3 Rs to 15 Rs at four wavelengths (393.5, 405.0, 398.7, and 423.4 nm). Preliminary analysis shows that BITSE imaged the solar minimum corona with the equatorial streamers on the east and west limbs. The narrow streamers observed by BITSE are in good agreement with the geometric properties obtained by the Solar and Heliospheric Observatory (SOHO) coronagraphs in the overlapping physical domain. In spite of the small signal-to-noise ratio we were able to obtain the temperature and flow speed of the western steamer. In the heliocentric distance range 4 - 7 Rs on the western streamer, we obtained a temperature of ~ 1.0 ± 0.3 MK and a flow speed of ~ 260 km s-1 with a large uncertainty interval.

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Development of the Command and Data Handling System and Flight Software of BITSE

  • Park, Jongyeob;Baek, Ji-Hye;Jang, Bi-ho;Choi, Seonghwan;Kim, Jihun;Yang, Heesu;Kim, Jinhyun;Kim, Yeon-Han;Cho, Kyung-Suk;Swinski, Joseph-Paul A.;Nguyen, Hanson;Newmark, Jeffrey S.;Gopalswamy, Natchumuthuk
    • 천문학회보
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    • 제44권2호
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    • pp.57.4-57.4
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    • 2019
  • BITSE is a project of balloon-borne experiments for a next-generation solar coronagraph developed by a collaboration with KASI and NASA. The coronagraph is built to observe the linearly polarized brightness of solar corona with a polarization camera, a filter wheel, and an aperture door. For the observation, the coronagraph is supported by the power distribution unit (PDU), a pointing system WASP (Wallops Arc-Second Pointer), telemetry & telecommand system SIP (Support Instrument Package) which are developed at NASA's Goddard Space Flight Center, Wallops Flight Facility, and Columbia Scientific Balloon Facility. The BITSE Command and Data Handling (C&DH) system used a cost-off-the-shelf electronics to process all data sent and received by the coronagraph, including the support system operation by RS232/422, USB3, Ethernet, and digital and analog signals. The flight software is developed using the core Flight System (cFS) which is a reusable software framework and set of reusable software applications which take advantage of a rich heritage of successful space mission of NASA. The flight software can process encoding and decoding data, control the subsystems, and provide observation autonomy. We developed a python-based testing framework to improve software reliability. The flight software development is one of the crucial contributions of KASI and an important milestone for the next project which is developing a solar coronagraph to be installed at International Space Station.

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원격탐사 위성의 고도와 궤도기울기 결정 (THE SELECTION OF ALTITUDE AND INCLINATION FOR REMOTE SENSING SATELLITES)

  • 이정숙;이병선
    • Journal of Astronomy and Space Sciences
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    • 제12권2호
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    • pp.244-255
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    • 1995
  • 위성의 미션은 적합한 궤도가 선태기될 때 적절히 수행될 수 있다. 지구를 관측하는 원격탐사 위성의 경우, 관측의 특성에 따라 최적의 태양고도각을 유지해야 하므로 태양동주기 궤도가 적합하다. 지구의 비대칭 중력포텐셜로 인한 영년섭동력을 이차항까지 전개하고 영년섭동력에 의한 승교점의 변화로부터 태양동주기 궤도를 유지하기 위한 제한조건을 유도하였다. 또한, 태양동주기 궤도의 고도와 궤도기울기를 계산하기 위한 알고리즘을 제시하고, 이 방법을 이용하여 미국의 ERTS 위성과 인도의 IRS 위성 등 네 개의 원격탐사 위성의 고도와 궤도기울기를 계산해 보았다. 이 위성의 궤도요소로부터 궤도를 쳬측하여 얻은 지상궤적을 통해 계산된 결과를 검증하였다.

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BITSE Preliminary Result and Future Plan

  • Bong, Su-Chan;Yang, Heesu;Lee, Jae-Ok;Kwon, Ryun Young;Cho, Kyung-Suk;Kim, Yeon-Han;Reginald, Nelson L.;Yashiro, Seiji;Gong, Qian;Gopalswamy, Natchumuthuk;Newmark, Jeffrey S.
    • 천문학회보
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    • 제44권2호
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    • pp.58.2-58.2
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    • 2019
  • BITSE is a technology demonstration mission to remotely measure the speed, temperature, and density of the solar wind as it forms as close as 3 Rs. BITSE obtained coronal images during its one day flight above more than 99% of the atmosphere, and calibration data are taken in the laboratory as well as during the flight. As the linearly polarized K-corona is much fainter than other bright sources like diffraction, sky, and F-corona, a careful data reduction is required to obtain reliable scientific results. We will report status of the obtained data, the reduction progress, and future plan.

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Development of a diagnostic coronagraph on the ISS: CODEX progress report

  • Kim, Yeon-Han;Choi, Seonghwan;Bong, Su-Chan;Cho, Kyungsuk;Newmark, Jeffrey;Gopalswamy, Nat.
    • 천문학회보
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    • 제46권2호
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    • pp.79.3-79.3
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    • 2021
  • The Korea Astronomy and Space Science Institute (KASI) has been developing a diagnostic coronagraph to be deployed in 2023 on the International Space Station (ISS) in collaboration with the NASA Goddard Space Flight Center (GSFC). The mission is known as "Coronal Diagnostic Experiment (CODEX)", which is designed to obtain simultaneous measurements of the electron density, temperature, and velocity using multiple filters in the 2.5-10 Rs range. The coronagraph will be installed and operated on the ISS to understand the physical conditions in the solar wind acceleration region, and to enable and validate the next generation space weather models. In this presentation, we will introduce recent progress and future plan.

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