• Title/Summary/Keyword: satellite operation

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Mission Operation Capability Verification Test for Low Earth Orbit(LEO) Satellite by Utilizing Interface Environment between LEO Satellite and Ground Station (저궤도 위성과 지상국간 접속 환경을 활용한 임무수행능력 지상 검증 시험)

  • Lee, Sang-Rok;Koo, In-Hoi;Lim, Seong-Bin
    • Aerospace Engineering and Technology
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    • v.13 no.2
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    • pp.142-149
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    • 2014
  • After launch of Low Earth Orbit(LEO) satellite, Initial Activation Checkout(IAC) and Calibration and Validation(Cal & Val) procedure are performed prior to enter normal operation phase. During normal operation phase, most of the time is allocated for mission operation except following up measures to anomaly and orbit maintenance. Since mission operation capability is key indicator for success of LEO satellite program and consistent with promotion purpose of LEO satellite program, reliability should be ensured by conducting through test. In order to ensure reliability by examining the role of LEO satellite and ground station during ground test phase, realistic test scenario that is similar to actual operation conditions should be created, and test that aims to verify full mission cycle should be performed by transmitting created command and receiving image and telemetry data. This paper describes the test design and result. Consideration items for test design are described in detail and result of designed test items are summarized.

MEASUREMENT OF IMPLEMENTATION LOSS FOR BRIT RECEIVER

  • Park Durk-Jong;Koo In-Hoi;Yang Hyung-Mo;Ahn Sang-Il;Kim Eun-Kyu
    • Proceedings of the KSRS Conference
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    • 2005.10a
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    • pp.561-563
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    • 2005
  • From the IF (Intermediated Frequency) loop-back test, BER (Bit Error Rate) degradation of processed data, HRIT (High Rate Information Transmission), is estimated by proposed measurement configuration. The specific parameters, likely data rate, FEC (Forward Error Correction), and modulation method, are based on the outcomes of SRR (System Requirements Review) which was held on 13-14 June 2005, in Toulouse. The proposed measurement procedure is that combined 70MHz modulated signal and noise is connected to the spectrum analyzer and receiver. The former measures the C/No (Carrier to Noise density ratio) and the latter estimates BER of FEC decoded data. Implementation loss can be obtained by subtracting measured BER from calculated BER which is also subtracted data rate from measured C/No. This test procedure is very simple and can be applied to assess the implementation loss of dedicated receiver for HRIT in the future.

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PERFORMING OF SOC DATS INTERFACE TEST WITH MODEM/BB

  • Park, Durk-Jong;Hyun, Dae-Hwan;Koo, In-Hoi;Ahn, Sang-Il;Kim, Eun-Kyou
    • Proceedings of the KSRS Conference
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    • v.1
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    • pp.64-66
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    • 2006
  • DATS will connect with IMPS and LHGS to perform the reception of sensor data and the transmission of user's meteorological data, LRIT and HRIT. MODEM/BB will perform the de-commutation of received sensor data as MI and GOCI raw data according to VCID before sending them to MI and GOCI IMPS, respectively. Especially, MODEM/BB in SOC needs to be connected to six clients that consist of the primary and backup IMPS of MSC, KOSC and SOC. On the other hand, LRIT and HRIT delivered from LHGS are encoded as VITERBI and modulated by MODEM/BB. Considering sensor data transmitted from COMS, the assumed format and size of CADU are described in this paper. Finally, results related to the status of received LRIT and HRIT by frame synchronizer in user station are also described.

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KOMPSAT Image Processing and Applications (다목적실용위성 영상처리 및 활용)

  • Lee, Kwangjae;Kim, Younsoo;Choi, Haejin
    • Korean Journal of Remote Sensing
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    • v.33 no.6_3
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    • pp.1171-1177
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    • 2017
  • This special issue introduces recent researches on KOMPSAT(KOrea Multi-Purpose SATellite) image processing and applications. In this paper, the status of KOMPSAT development and national satellite image application policy are introduced and the implications of the papers presented in the special issue are discussed. Satellite image resources and application policy that can be utilized through continuous satellite development are considered to be systematically prepared. Therefore, if data processing and application technology development for various fields such as forest and urban change detection, image correction technology introduced in this paper are continuously carried out, it is expected that the competitiveness of national satellite image will be further strengthened.

Crew`s Remote Sensing Researches on the International Space Station

  • Lee Joo-Hee;Choi Gi-Hyuk;Kim Yeon-Kyu;Kim Jong-Woo
    • Proceedings of the KSRS Conference
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    • 2004.10a
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    • pp.386-388
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    • 2004
  • The International Space Station (ISS) offers research opportunities to researchers through crew's space mission in the field of remote sensing. ISS provides the facilities to place and operate experiment equipments in a variety of fields, especially, microgravity experiments and Earth observations. This paper is intended to give readers a brief introduction to the ISS utilization and the capabilities for remote sensing researches. We investigate what kind of crew missions and payloads should be developed for remote sensing researches on the ISS.

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Energy Balance Analysis of Electrical Power System for Communication Satellite (통신방송위성 전력시스템의 Energy Balance 해석)

  • Choi Jae-dong;Koo Cheol-hea
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.81-84
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    • 2001
  • In the power system of a satellite, solar array and a battery have directly impact on the life time of the satellite, and their stable operation is decided by whether their states are in the steady state operation or not. In this study, solar array capacity and battery characteristics of proposed communication satellite are designed and simulation is conducted according to the operation mode. Each operation mode is classified as the normal and worst case modes, respectively. The normal mode is analyzed under daylight and the eclipse with the EHT burn, and the worst case modes which have solar cell circuit failure, and battery cell failure are analyzed too.

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Detection of 2002-2003 El Ni${\tilde{n}}$o Using EOS and OSMI Data

  • Lee, S.H.;Lim, H.S.;Kim, J.G.;Jun, J.N.
    • Proceedings of the KSRS Conference
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    • 2003.11a
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    • pp.1413-1414
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    • 2003
  • Interannual variability in the patterns of satellitederived pigment concentrations, sea-level height anomaly, sea surface temperature anomaly, and zonal wind anomaly are observed during the 2002-2003 El Ni${\tilde{n}}$o. The largest spatial extent of the phytoplankton bloom was recovery from El Ni${\tilde{n}}$o over the equatorial Pacific. The evolution towards a warm episode (El Ni${\tilde{n}}$o) started from spring of 2002 and continued during January 2003, while equatorial Sea Surface Temperature Anomaly (SSTA) remained greater than +1$^{\circ}$C in the central equatorial Pacific. The EOS (Earth Observing System) and OSMI (Ocean Scanning Multispectral Imager) data are used for detection of dramatic changes in the patterns of pigment concentration during El Ni${\tilde{n}}$o.

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Quick Evaluation of Spacecraft Orbit Maneuver Using Small Sets of Real-time GPS Navigation Solutions

  • Lee, Byoung-Sun;Lee, Ho-Jin;Lee, Seong-Pal;Kim, Jong-Ah;Park, Hae-Jin
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.458-458
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    • 2000
  • Quick evaluations of two in-plane orbit maneuvers using small see of real-time CPS navigation solutions were peformed lot the KOMPSAT-1 spacecraft operation. Real-time GPS navigation solutions of the KOMPSAT-1 were collected during the Korean Ground Station(KGS) pass. Only a few sets of position and velocity data after completion of the thruster firing were used for the quick maneuver evaluations. The results were used for antenna pointing data predictions for the next station contact. Normal orbit maneuver evaluations using large see of playback GPS navigation solutions were also performed and the result were compared with the quick evaluation results.

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Mechanism Design of Cube Satellite for Multi-deployable Structures and Autonomous System Operation after Launcher Separation (복수구조 전개 및 발사체 분리직후 시스템 자동운용을 위한 큐브위성의 메커니즘 설계)

  • Lee, Myoung-Jae;Jung, Hyun-Mo;Oh, Hyun-Ung
    • Journal of Aerospace System Engineering
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    • v.7 no.3
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    • pp.20-25
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    • 2013
  • In case of cube satellite, it is difficult to realize the same performance as commercial satellite due to its highly restricted unit accommodation space. To maximize the performance of the cube satellite, design concept considering the multi-function of satellite is required. In this paper, mechanism design of cube satellite which is applicable for the holding and release of multi-deployable structures has been proposed and investigated. In addition, a switch mechanism design for the autonomous system operation just after the cube satellite separation from P-POD has also been proposed. The effectiveness of the mechanism design for holding and release of multi-deployable structures has been demonstrated by EM test of the holding and release mechanism.

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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