• Title, Summary, Keyword: satellite communication system

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INTRODUCTION OF DATELLITE COMMUNICATION SYSTEM TEST LANGUNGE

  • Ahn, Dong-Hyun;Jung, Won-Chan
    • 제어로봇시스템학회:학술대회논문집
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    • pp.229-231
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    • 1994
  • For the effective use of satellite communication transponder, tests for the payload system such as IOT(In-Orbit Test), RPM(Routine Payload Monitoring), CSM(Communicatios System Monitoring), and REV(Remote Earth-Station Verification) have to be conducted. Those tests are used in order to verify the condition and generic design of the satellite, to provide a database for operational calculations, and to maintain the quality of communication services. As the satellite communication system gets with wider expansion with higher complexity of operation, tests for the communication system also need more complex operation that usesophisticated computer-controlled measuring system. For and C language based measurement functions, which uses GPIB protocol and SCPI commands. But SICL requires knowledge of BASIC and C language as well as GPIB and SCPL system. This paper introduces a new language called CALSTEP-Control and Access Language for the Systems of Test Equipment and Payload. This language is designed for the operator to perform the tests for the satellite communication system without any special knowledge that is mentioned above. This language has very limited number of commands which are to be used to control the payload system and test equipments to perform IOT and CSM, and those commands are very readable and easy to understand, so an operator without any knowledge of BASIC and C programming language, or SICL and SCPI command can use it.

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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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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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A SYSTEM DESIGN AND ANALYSIS FOR SATELLITE COMMUNICATION LINK

  • Chung, Tae-Jin;Eun, Jong-Won
    • Journal of Astronomy and Space Sciences
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    • v.17 no.2
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    • pp.257-266
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    • 2000
  • A satellite RF communication link is analyzed based on a simple fundamental equations by systematic approach in this paper. The number of variables related to a design and analysis of satellite RF link is often a dozen or more, thus it is a tedious and time-consuming task. With the given input data, the important parameters are calculated step by step and three communication characteristics such as communication channel capacity, carrier-to-noise ratio(CNR) at the satellite and ground station are analyzed. It gives very useful information to the system engineers for designing and analyzing the overall satellite communication system in the conceptual design phase.

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A Study on the Development of Tele-Consulting System of Radiology using Asymetric Satellite Data Communication System (비대칭 위성 데이터 통신 시스템을 이용한 원격 진단 방사선 컨설팅 시스템 개발에 관한 연구)

  • Hwang, S.C.;Kim, Y.M.;Kim, H.J.;Lee, M.H.
    • Proceedings of the KOSOMBE Conference
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    • v.1997 no.11
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    • pp.180-183
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    • 1997
  • In this paper, we present the Tele-consulting system of radiology, which uses the communication network as asymetric satellite data communication system. The asymetric satellite data communication system uses receive-only satellite links or data delivery and PSTN(Public Switched Telephone Network) modem or N-ISDN(Integrate Services Digital Network) for communication. The satellite communication linking shows the very high-speed performance than 28.8kbps modem linking. The satellite linking is 5 - 10 times aster than the modem linking. Consequently, we get the conclusion that our system is suitable or tele-radiology and telemedicine.

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Implementation of Voice and Data Interworking System for Next Generation Military Satellite System (차기 군 위성체계를 위한 음성 및 데이터 연동시스템 구현)

  • Lee, Kyung-Ho;Lee, Sung-Jae;Ahn, Jong-Chul
    • The Journal of Korean Institute of Information Technology
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    • v.15 no.11
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    • pp.139-147
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    • 2017
  • The modern battlefield environment is rapidly changing to the Network Centric Warfare that can control the battlefield situation. To support this, the Ministry of National Defense has established an integrated command and control system to operate a satellite communication system capable of supporting satellite communication services in a wide area. Next-generation military satellite system, which is a follow-on satellite system, supports ALL-IP based distributed network satellite link and constitutes a link to the all-military integrated network that can manage the operations of the Army, Navy and Air Force. The Flyaway satellite terminal, which is a terrestrial terminal for satellite system, uses Header Compression and Window scaling technology using SCPS-TP to overcome the propagation delay phenomenon of geostationary satellite and implemented voice call processing technology to ensure compatibility with the existing satellite communication system ANASYS satellite system.

Performance Analysis of DPSK Optical Communication for LEO-to-Ground Relay Link Via a GEO Satellite

  • Lim, Hyung-Chul;Park, Jong Uk;Choi, Mansoo;Choi, Chul-Sung;Choi, Jae-Dong;Kim, Jongah
    • Journal of Astronomy and Space Sciences
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    • v.37 no.1
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    • pp.11-18
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    • 2020
  • Satellite optical communication has gained significant attention owing to its many quality features (e.g., a larger bandwidth, license free spectrum, higher data rate, and better security) compared to satellite microwave communication. Various experiments have been performed during many space missions to demonstrate and characterize inter-satellite links, downlinks, and uplinks. Korea has also planned to establish an experimental communication system using a geostationary earth orbit (GEO) satellite and the Geochang station as an optical ground station for low Earth orbit (LEO)-to-ground optical relay links. In this study, the performance of inter-satellite communication links and downlinks was investigated for the new Korean experimental communication system in terms of link margin, bit error rate (BER), and channel capacity. In particular, the performance of the inter-satellite links was analyzed based on the receiving apertures and the transmitting power, while that of the downlink was analyzed in terms of atmospheric turbulence conditions and transmitting power. Finally, we discussed two system parameters of receiving aperture and transmitting power to meet the three criteria of link margin, BER, and channel capacity.

The Construction of the Satellite communication network for Power Industry (전력산업용 위성통신망 구축)

  • Kim, Soo-Bae;Oh, Kyu-Whan;Jung, Kwang-Kyoon;Lee, Beom-Seok;Hyun, Duck-Hwa
    • Proceedings of the KIEE Conference
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    • pp.497-499
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    • 2006
  • There are several types of communication method which is used for the supply of electric power stably. But the communication methods used in KEPCO have weak points in the viewpoint of economy, technology and management. The Satellite communication systems have competitive power in price and technology for national wide utility owing to its wide area coverage and stability. This paper presents various adapted examples of the Power industry using he satellite communication systems.

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CURRENT STATUS OF COMS PROGRAM DEVELOPMENT

  • Baek, Myung-Jin;Han, Cho-Young
    • Proceedings of the KSRS Conference
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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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