• Title/Summary/Keyword: satellite communication system

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Design, Implementation and Validation of the KOMPSAT Spacecraft Simulator

  • Choi, Wan Sik;Lee, Sanguk;Eun, Jong Won;Choi, Han Jun;Chae, Dong Suk
    • International Journal of Aeronautical and Space Sciences
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    • v.1 no.2
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    • pp.50-67
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    • 2000
  • The spacecraft simulator is used for command validation, operational check of the Satellite Operation Subsystem (SOS), spacecraft anomaly analysis support, satellite operator training etc. In this paper, S/W design features and modeling characteristics of the KOMPSAT Spacecraft Simulator Subsystem (SIM) are described. Validation procedures and simulation results are also provided. The SIM provides extensive simulation capabilities by including models for most of the spacecraft subsystems. The software structure of the SIM was designed and implemented so as to support operations not only in real-time but also in non real-time by utilizing the Hewlett Packard (HP) UNIX functions. The SIM incorporates as many user-friendly Man Machine Interface (MMI) windows as possible so that all the SIM normal operations can be executed through the MMI windows.

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End-to-End Soft QoS Approach for IMS-based Integrated Satellite/Terrestrial Network Architecture

  • Chowdhury, Mostafa Zaman;Jang, Yeong-Min
    • Journal of Satellite, Information and Communications
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    • v.2 no.2
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    • pp.85-91
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    • 2007
  • The satellite networks provide global coverage. The integration of terrestrial networks with a satellite network is the most attractive approach to develop a global communication system. The IP Multimedia Subsystem (IMS) is intended to be the system that will merge the internet with the telecom world. A user with a dual-mode terminal can access both the satellite network and terrestrial network. The seamless handoff between two networks and a user's QoS level is the major issue concerning this integration. In this paper, we propose IMS-based satellite/terrestrial integrated network architecture for a global communication system. Based on the proposed architecture, an inter-network handoff and end-to-end soft QoS procedure is discussed. Our proposed soft QoS scheme is also analyzed to calculate the number of rejected calls.

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Development of Fast Internet based TelePAGS using Satellite Channel (위성 통신을 이용한 고속 인터넷 기반의 원격 PACS 개발)

  • Choi, I.K.;Kim, S.J.;Lee, J.Y.;Hwang, S.C.;Lee, M.H.
    • Proceedings of the KIEE Conference
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    • 1999.07g
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    • pp.3249-3252
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    • 1999
  • In this paper, we present the Tele-PACS of radiology, which uses the communication network as asymetric satellite data communication system. The asymetric satellite data communication system uses receive-only satellite links for 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 terrestial linking such as 28.8 kbps modem linking and 56Kbps linking. The satellite linking is 5 - 10 times faster than the 56Kbps linking. We conclude that 1) Satellite networking is currently the cheapest and fastest solution for internet access. 2) Web-based Image-Viewer enables small size hospitals in rural area to connect to central PACS easily and to retrieve the image data reliably. 3) The suggested teleradiology system using satellite networking could be adequate to fast telemedicine and telecare for rural hospitals especially located in geographically isolated areas such as islands.

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A Study on the Tracking Antenna System for Satellite Communication Using Embedded Controller

  • Kim, Jong-Kwon;Cho, Kyeum-Rae;Lee, Dae-Woo;Jang, Cheol-Soon
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.413-416
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    • 2004
  • The tracking antenna system must be always pointed to a satellite for data link among moving vehicles. Especially, for an antenna mounted on a moving vehicle, it needs the stabilized the antenna system. So, software and hardware, signal processing of motion detection sensors, real-time processing of vehicle dynamics, trajectory estimation of satellite, antenna servo mechanism, and tracking algorithm, are unified in the antenna system. The purpose of this paper is to design the embedded tracking antenna control system for satellite communication. The embedded OS(Operating System) based stabilization and tracking algorithm was implemented. The performance of the designed embedded control system was verified by the real satellite communication test.

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The Telex Service Characteristics of Maritime Satellite Communication System (해상위성통신 시스템의 Telex Service 특성에 관한 연구)

  • 김창호;최삼길
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.3 no.1
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    • pp.121-127
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    • 1999
  • In this paper, it propose channel format, characteristics, call establishment and removal algorithm about the telex services of maritime satellite communication system. It would adapt the propose to a basic technic of internal maritime affairs satellite communication system.

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SERVICE AND NETWORK OPERATION OF THE MULTIBEAM SWITCHING SATELLITE COMMUNICATIONS SYSTEM

  • Choi Kyung Soo;Sin Cheon Sig;Jo Jin Ho;Lee Yong Min;Lee Seong Pal
    • Bulletin of the Korean Space Science Society
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    • 2004.10b
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    • pp.351-355
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    • 2004
  • A multibeam switching satellite system technology have started localized development to overcome the limitation of the frequency resource and geostationary orbit existing relay type satellite transponder and the required performance of the spot beam, and looked around the configuration and functions of the multibeam switching satellite communication system. This paper proposed that operation scheme and network control features for service definition, network architecture, transmission method of the natural disaster service network and public communication service network using this system.

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The system performance analysis and implementation of Digital Communication Satellite (디지털위성중계기 시스템 성능 분석 및 구현)

  • Kim, Ki-Jung;Seo, Hak Geum
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.4
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    • pp.439-446
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    • 2014
  • This study introduces about the analysis, verification and implementation of Digital Communication Satellite transponder. Through the pre-performance analysis of each component by the circuit level simulation, each component's performance was checked whether satisfying the specifications. When each of the components was connected in order, System's performances were evaluated through system harmonic balanced simulation whether satisfying the specifications. Through pre-analysis of the system performance, specification of each component was defined. On the basis of that specification, Components which comprise the Digital Communication Satellite repeater were manufactured, and finally, the overall system performance check was made by integrating the components of Digital Communication Satellite transponder.