• 제목, 요약, 키워드: Satellite Communication

검색결과 1,574건 처리시간 0.044초

A STUDY ON FUEL ESTIMATION ALGORITHMS FOR A GEOSTATIONARY COMMUNICATION & BROADCASTING SATELLITE

  • Eun, Jeong-Won
    • Journal of Astronomy and Space Sciences
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    • v.17 no.2
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    • pp.249-256
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    • 2000
  • It has been developed to calculate fuel budget for a geostationary communication and broadcasting satellite. It is quite essential that the pre-launch fuel budget estimation must account for the deterministic transfer and drift orbit maneuver requirements. After on-station, the calculation of satellite lifetime should be based on the estimation of remaining fuel and assessment of actual performance. These estimations step from the proper algorithms to produce the prediction of satellite lifetime. This paper concentrates on the fuel estimation method that was studied for calculation of the propellant budget by using the given algorithms. Applications of this method are discussed for a communication and broadcasting satellite.

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DEVELOPMENT OF ON-BOARD SOFTWARE FOR COMS GEOSTATIONARY OCEAN COLOR IMAGER

  • Park, Su-Hyun;Koo, Cheol-Hae;Kang, Soo-Yeon;Yang, Koon-Ho;Choi, Seong-Bong
    • 대한원격탐사학회:학술대회논문집
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    • v.1
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    • pp.257-259
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    • 2006
  • The Communication Ocean Meteorological Satellite (COMS) is a geostationary satellite being developed by Korea Aerospace Research Institute. Geostationary Ocean Color Imager (GOCI) is one of the payloads embarked on the COMS satellite. It acquires ocean images around Korea in 8 visible spectral bands with a spatial resolution of about 500 m. The acquired data are used to provide forecasting and now casting of the ocean state. The GOCI operations are controlled by the satellite embedded software, i.e. on-board software. This paper introduces the GOCI payload of the COMS satellite and describes the control software for the GOCI.

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CURRENT STATUS OF COMS PROGRAM DEVELOPMENT

  • Baek, Myung-Jin;Han, Cho-Young
    • 대한원격탐사학회:학술대회논문집
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    • pp.45-48
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    • 2007
  • COMS satellite is a multipurpose satellite in the geostationary orbit, which accommodates multiple payloads of Meteorological Imager, Geostationary Ocean Color Imager and Ka band Satellite Communication Payload in a single spacecraft platform. In this paper, current status of Korea's first geostationary Communication, Ocean and Meteorological Satellte(COMS) program development is introduced. The satellite platform is based on the Astrium EUROSTAR 3000 communication satellite, but creatively combined with MARS Express satellite platform to accommodate three different payloads efficiently for COMS. The system design difficulties are in the different kinds of payload mission requirements of communication and remote sensing purposes and how to combine them into a single satellite to meet the overall satellite requirements. The COMS satellite critical design has been accomplished successfully to meet three different mission payloads. The platform is in Korea, KARI facility for the system integration and test. The expected launch target of COMS satellite is scheduled in June 2009.

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Secure control of satellite communication system using cryptosystem

  • Hong, Ki-Yoong
    • 제어로봇시스템학회:학술대회논문집
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    • pp.218-223
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    • 1994
  • On the satellite communication system, conventional key issues of control have been focused on the attitude and orbit control, monitoring and control of communication payload such as IOT(In-Orbit-Test) and CSM(Communication System Monitoring) and so on. As the vulnerabilities are being increased on the satellite communication network, security services are required to protect it against security violated attacks. In this paper, a security architecture for satellite communication network is presented in order to provide security services and mechanisms. Authentication protocol and encryption scheme are also proposed for spacecraft command authentication and confidentiality.

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차기군위성통신에서 지상망 ALL-IP 연동을 위한 네트워크 운용구조 및 데이터링크 프로토콜 연구 (A Study on Network Operation Structure and DataLink Protocol for Interworking of Ground Network ALL-IP at Next-Military Satellite Communication)

  • 이창영;강경란;심용희
    • 한국군사과학기술학회지
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    • v.21 no.6
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    • pp.826-841
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    • 2018
  • The military satellite communication of ROK military, ANASIS is designed for analog data such as voice and streaming data. ANASIS cannot fully support ALL-IP communications due to its long propagation delay. The next generation satellite communication system is being designed to overcome the limitation. Next generation satellite communications system considers both high-speed and low-speed networks to support various operating environment. The low-speed satellite supports both broadband and narrow-band communication. This network works as the infrastructure for of wide-area internetworking over multiple AS's in the terrestrial network. It requires minimum satellite frequency and minimum power and works without PEP and router. In this paper, we propose a network operation structure to enable the inter-operation between high and low-speed satellite networks. In addition, we propose a data link protocol for low speed satellite networks.

Ka-대역 위성 통신의 위한 강우에 의한 전파 감쇠 예측 모델 (Prediction Model of Rain Attenuation for Ka-Band Satellite Communication)

  • 우병훈;강희조
    • 한국정보통신학회논문지
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    • v.6 no.7
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    • pp.1038-1043
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    • 2002
  • The demand for multimedia service using Ka-band satellite communication are growing rapi이y. So, in this paper, we have analyzed rain attenuation with typical model, and proposed prediction model of rain attenuation in high frequency(over 20[GHz]). Path loss model by rain attenuation is based upon rain rate of representative region(6 cities). Proposed prediction model of rain attenuation and parameter of satellite link can be available for the Ka-band satellite communication.