• Title/Summary/Keyword: COMS MI

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COMS CADU DATA GENERATION FOR COMS IMPS TEST

  • Seo, Seok-Bae;Ahn, Sang-II
    • Proceedings of the KSRS Conference
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    • 2008.10a
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    • pp.88-91
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    • 2008
  • The COMS IMPS (Communication Ocean and Meteorological Satellite IMage Pre-processing Subsystem) is developed for image pre-processing of COMS. For a test of the COMS IMPS, 7 support software are developed in KARI GS using simulated MI/GOCI WB (Wide-Band) data; COMS Fill Adder, MI (Meteorological Imager) CADU generator, GOCI (Geostationary Ocean Colour Imager) CADU generator, COMS CADU combiner, MI SD (Sensor Data) analyzer, GOCI SD analyzer, and COMS DM (Decomposition Module) test harness. This paper explains functions of developed support software and the COMS IMPS test using those software.

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MI2U CONTROL FLIGHT SOFTWARE DESIGN AND DEVELOPMENT IN COMS

  • Kang, Seo-Yeon;Park, Su-Hyun;Koo, Cheol-Hae;Yang, Koon-Ho;Choi, Seong-Bong
    • Proceedings of the KSRS Conference
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    • v.1
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    • pp.271-273
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    • 2006
  • In this paper, we describe the MI2U ORB function which is a part of the flight software executed on SCU and controls MI2U/MI which is one of three payloads on COMS. The MI2U ORB function manages MI2U/MI redundancy and reconfiguration, monitors MI2U/MI equipment, performs FDIR, and provides the routing service of commands from Ground/IP (Interpreted Program) through the current used 1553 channel. The MI2U hardware achieves the interface between the SCU and the MI. The MI2U is connected to SCU through MIL-STD-1553B system bus. The MI2U has the internal redundancy but is used in cold redundancy. The MI2U ORB function considers that they are not expected to be simultaneously switched on. The connection combination between MI2U and MI is electrically cross-strapped. However the MI2U ORB function considers only two combinations (MI2U A + MI 1, MI2U B + MI 2). Other combinations can be manually achieved by ground in case of the emergency case.

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OVERVIEW OF COMS GROUND SYSTEM AT METEOROLOGICAL SATELLITE CENTER OF KMA

  • Lee, Hyun-Kyoung;Lee, Bong-Ju;Lee, Yong-Sang;Shim, Jae-Myun;Suh, Ae-Sook;Kim, Hong-Sic;Je, Chang-Eon
    • Proceedings of the KSRS Conference
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    • v.1
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    • pp.159-162
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    • 2006
  • This paper describes the ground system for COMS (Communication, Ocean, and Meteorological Satellite), the first Korean multi-purposed geostationary satellite, at MSC (Meteorological Satellite Center) in Korea. The overview of COMS MI (Meteorological Imager) will be introduced as well. KMA would implement mission planning for COMS MI operation and receive, process, interpret, disseminate, and archive MI data operationally for domestic and foreign user groups. Major missions of COMS MI are mitigation of natural hazard such as typhoon, dust storm, and heavy rain, and short-term warning of severe weather to protect human health and commerce. Moreover, research of climate variability and long-term changes will be supported. In accordance with those missions, the concept and design of COMPASS (COMS operation and meteorological products application service system), the ground system for COMS MI in MSC, have been setting up since 2004. Currently, COMPASS design is being progressed and will have finished the end of 2006. The development of COMPASS has three phases: first phase is development of fundamental COMPASS components in 2007, second phase is to integrate and test all of the COMPASS components in 2008, and the last phase is to operate COMPASS after COMS In-Orbit Tests in 2009.

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Characteristics of COMS MI Radiometric Calibration

  • Cho, Young-Min
    • Proceedings of the KSRS Conference
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    • v.1
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    • pp.71-74
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    • 2006
  • Communication Ocean Meteorological Satellite (COMS) is planned to be launched onto Geostationary Earth Orbit in 2008. The meteorological imager (MI) is one of COMS payloads and has 5 spectral channels to monitor meteorological phenomenon around the Korean peninsular intensively and of Asian-side full Earth disk periodically. The MI has on-board radiometric calibration capabilities called 'blackbody calibration' for infrared channels and 'space look' for infrared/visible channels, and radiometric response stability monitoring device called 'albedo monitor' for visible channel. Additionally the MI has on-board function called 'electrical calibration' for the check of imaging path electronics of both infrared and visible channels. The characterization of MI performance is performed to provide the pre-launch radiometric calibration data which will be used for in-orbit radiometric calibration with the on-board calibration outputs. The radiometric calibration of the COMS MI is introduced in the view point of instrument side in terms of in-orbit calibration devices and capabilities as well as the pre-launch calibration activities and expected outputs.

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Verification and Analysis of COMS MI2U ORB Test (정지궤도위성 기상탑재체 접속장치 ORB 검증시험 및 결과 분석)

  • Kim, Young-Yun;Choi, Jong-Yeon;Kwon, Jae-Wook;Youn, Young-Su;Cho, Seoung-Won
    • Aerospace Engineering and Technology
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    • v.6 no.2
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    • pp.66-72
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    • 2007
  • In this study, we would like to report the analysis of COMS(Communication, Ocean & Meterological Satellite) MI2U(Meteo-Imager Interface Unit) ORB (On Board Reconfiguration) verification test. MI2U is one of equipment integrated on COMS and in charge of TM/TC function and Power Supply function of MI(Meteo-Imager). COMS, an geo-stationary satellite, is a multi-functional satellite accommodation two observation payloads and one communication payload.

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PRELIMINARY COMS AOCS DESIGN FOR OPTIMAL OPTICAL PAYLOADS OPERATIONS

  • Park, Young-Woong;Park, Keun-Joo;Lee, Hun-Hei;Ju, Gwang-Hyuk;Park, Bong-Kyu
    • Proceedings of the KSRS Conference
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    • v.1
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    • pp.290-293
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    • 2006
  • COMS (Communication, Ocean and Meteorological Satellite) shall be operated with two remote sensing payloads, MI (Meteorological Imager) and GOCI (Geostationary Ocean Color Imager). Since both payloads have rotating mechanisms, the dynamic coupling between two payloads is very important considering the pointing stability during GOCI operation. In addition, COMS adopts a single solar wing to improve the image quality, which leads to the unbalanced solar pressure torque in COMS. As a result, the off-loading of the wheel momentum needs to be performed regularly (2 times per day). Since the frequent off-loading could affect MI/GOCI imaging performance, another suboptimal off-loading time needs to be considered to meet the AOCS design requirements of COMS while having margin enough in the number of thruster actuations. In this paper, preliminary analysis results on the pointing stability and the wheel off-loading time selection with respect to MI/GOCI operations are presented.

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Stray Light Impacts on the COMS MI Images during the Eclipse Period (식기간 동안의 천리안 기상영상에 대한 미광의 영향 분석)

  • Jin, Kyoung-Wook;Park, Bong-Kyu
    • Aerospace Engineering and Technology
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    • v.11 no.2
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    • pp.12-18
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    • 2012
  • In this paper, impacts on the COMS MI images during the COMS eclipse period were analyzed and the method to eliminate the contaminated area was investigated. Main effect on the meteorological images during the eclipse is a stripping effect due to a strong stray light. The quantitative analyses were conducted during the COMS In-Orbit-Test period and the impacts of the stray light on the four infrared channels of the COMS MI according to the distance with respect to the Sun were examined. Based on the typical case of the stray light influence on the infrared channel of the MI, the intensity of contamination due to the stray light was investigated for each channel using the computed COMS eclipse information. The effectiveness of removal of a contaminated area by replacing the SWIR with the combined WINDOW channels was promising.

A Comparative Errors Assessment Between Surface Albedo Products of COMS/MI and GK-2A/AMI (천리안위성 1·2A호 지표면 알베도 상호 오차 분석 및 비교검증)

  • Woo, Jongho;Choi, Sungwon;Jin, Donghyun;Seong, Noh-hun;Jung, Daeseong;Sim, Suyoung;Byeon, Yugyeong;Jeon, Uujin;Sohn, Eunha;Han, Kyung-Soo
    • Korean Journal of Remote Sensing
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    • v.37 no.6_1
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    • pp.1767-1772
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    • 2021
  • Global satellite observation surface albedo data over a long period of time are actively used to monitor changes in the global climate and environment, and their utilization and importance are great. Through the generational shift of geostationary satellites COMS (Communication, Ocean and Meteorological Satellite)/MI (Meteorological Imager sensor) and GK-2A (GEO-KOMPSAT-2A)/AMI (Advanced Meteorological Imager sensor), it is possible to continuously secure surface albedo outputs. However, the surface albedo outputs of COMS/MI and GK-2A/AMI differ between outputs due to Differences in retrieval algorithms. Therefore, in order to expand the retrieval period of the surface albedo of COMS/MI and GK-2A/AMI to secure continuous climate change monitoring linkage, the analysis of the two satellite outputs and errors should be preceded. In this study, error characteristics were analyzed by performing comparative analysis with ground observation data AERONET (Aerosol Robotic Network) and other satellite data GLASS (Global Land Surface Satellite) for the overlapping period of COMS/MI and GK-2A/AMI surface albedo data. As a result of error analysis, it was confirmed that the RMSE of COMS/MI was 0.043, higher than the RMSE of GK-2A/AMI, 0.015. In addition, compared to other satellite (GLASS) data, the RMSE of COMS/MI was 0.029, slightly lower than that of GK-2A/AMI 0.038. When understanding these error characteristics and using COMS/MI and GK-2A/AMI's surface albedo data, it will be possible to actively utilize them for long-term climate change monitoring.

Study on Solar Constraint in the Operation of COMS Meteorological Imager

  • Cho Young-Min
    • Proceedings of the KSRS Conference
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    • 2004.10a
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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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Receiving Time Calculation Method for Lines of COMS MI LV1B Images (통신해양기상위성 기하보정 영상의 라인 별 수신시각 계산)

  • SEO, Seok-Bae;AHN, Sang-Il
    • Journal of Aerospace System Engineering
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    • v.3 no.2
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    • pp.24-30
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    • 2009
  • MI LV1B images, geometric corrected data of COMS MI, has no time information per each line, but field of weather prediction using the MI LV1B images needs time information on it. This paper explains two calculation methods for receiving time on lines of MI LV1B images and analyzes difference between two calculation methods using simulated data.

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