• Title/Summary/Keyword: TC(Telecommand)

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Implementation of CCSDS Telecommand Decryptor in Geostationary Communications Satellite (정지궤도 통신위성의 CCSDS 원격명령 암호복호기 구현)

  • Kim,Jung-Pyo;Gu,Cheol-Hoe;Choe,Jae-Dong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.31 no.10
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    • pp.89-96
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    • 2003
  • In this paper, a CCSDS(Consultative Committee for Space Data Systems) telecommand(TC) decryptor for the security of geostationary communications satellite was implemented. For the confidentiality of CCSDS TC datalink security, Option-A which implements the security services below the transfer sublayer was selected. Also CFB(Cipher Feedback) operation mode of DES(Data Encryption Standard) was used for the encryption of 56-bit data bits in 64-bit codeblock. To verify Decryptor function, the DES CFB logic implemented on A54SX32 FPGA(Field Programmable Gate Array) was integrated with interface and control logics in a PCB(Printed Circuit Board). Using a function test PC, the encrypted codeblocks were generated, transferred into the decryptor, decrypted, and the decrypted codeblocks were transmitted to the function test PC, and then compared with the source codeblocks. Through LED(Light Emitting Diode) ON operation by driving the relay related to Op-code decoded and the comparison between the codeblock output waveforms measured and those simulated, the telecommand decryptor function was verified.

Analysis of TM/TC data protocol of Military Unmanned Aerial Vehicles (군용 무인항공기의 TM/TC 데이터 프로토콜 분석)

  • Hong, Su-woon;Kim, Young-kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2017.05a
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    • pp.391-393
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    • 2017
  • Unmanned aerial vehicles(UAVs) operating in the military for various purposes are designed to transmit information collected according to the purpose to GCS(Ground Control System), and to transmit/receive the vehicle's operational control and status information using wireless communication(or datalink). Currently, the military UAV systems in operation in Korea use unique communication methods, protocols, and message structures for each system. In this paper, we analyze the TM/TC data protocol of two types of military UAV systems currently under development and propose a more efficient TM/TC message design scheme in wireless communication(or datalink) environment. And we will discuss issues to be considered for standardization of technology for ensuring interoperability with many UAVs or newly introduced UAV systems.

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COMS System Bus Design and Analysis using MIL-STD-1553B (MIL-STD-1553B 버스를 이용한 통신해양기상위성의 시스템 버스 설계 및 분석)

  • Cho, Young-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.7
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    • pp.1285-1289
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    • 2008
  • In this paper, we design COMS system bus that the 1553 Data Bus is able to link all the units of the satellite managed by the SCU using one Prime Data Bus and on Redundant Data Bus. Also we analyze MIL-STD-1553B bus load and relevant exchange memory budgets in system bus of the COMS satellite. This data is used in the satellite mission and software design by system engineer.

GA Optimized S-Band Quadrafilar Antenna with the Lowest Back Radiation for a Communication Satellite

  • Kahng, Sung-Tek;Kim, Joong-Pyo
    • Journal of electromagnetic engineering and science
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    • v.9 no.4
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    • pp.223-228
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    • 2009
  • In this paper, a quadrafilar antenna is designed to have a lower profile as an essential part of the size reduction technique and lower back radiation(i.e. higher forward radiation) for the S-band telemetry/telecommand(TM/TC) function of a communication satellite. Particularly, to meet the challenging requirements on the higher isolation between the TM/TC antennas and simultaneously a smaller size, the lowest back radiation and lowest cross-polarization, the optimal physical dimensions of the quadrafilar antenna are found by using the Genetic Algorithm(GA). To prove the validity of the proposed antenna design, its 3D electromagnetic analysis and measured results are compared, showing good agreement.

S-Band Quadrafilar Array Antenna with the Elements of Lowest Backradiation Designed by the GA Optimization (GA 최적 설계된 최소 후방방사특성의 5-대역 Quadrafilar 배열 안테나)

  • Kahng, Sung-Tek;Kim, Joong-Pyo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2468-2473
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    • 2009
  • In this paper, a quadrafilar antenna is designed to have a lower profile as an essential part of the size reduction technique and lower backradiation(namely, higher forward radiation) for the S-band telemetry/telecommand(TM/TC) function of a communication satellite. Particularly, to meet the challenging requirements on the higher isolation between the TM/TC antennas and simultaneously a smaller size, the lowest backradiation and lowest cross-polarization, the optimal physical dimensions of the quadrafilar antenna are found by using the Genetic Algorithm(GA). To prove the validity of the proposed antenna design, its 3D electromagnetic analysis and measured results are compared to show good agreement. Using this antenna as the elements, an array antenna is made to have directivity.

Design of TM/TC data protocol of Military Unmanned Aerial Vehicles (군용 무인기의 TM/TC 데이터 프로토콜 설계)

  • Hong, Su-woon;Kim, Young-kil
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.22 no.3
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    • pp.506-512
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    • 2018
  • Unmanned aerial vehicles(UAVs) operating in the military for various purposes are designed to transmit information collected according to the purpose to GCS(Ground Control System), and to transmit/receive the vehicle's operational control and status information using wireless communication(or datalink). Currently, the military UAV systems in operation in Korea use unique communication methods, protocols, and message structures for each system. Among these, the Division UAV is designed to transmit fixed size TM/TC data repeatedly and the Corps UAV is designed to transmit aperiodic TM/TC data to the variable length of the message-based. In this paper, we analyze the TM/TC data protocol of existing military UAV systems and present data protocol design method which is considered to be more efficient in wireless communication environment applied to equipment under development. And we will discuss issues to be considered for standardization of technology for ensuring interoperability with many UAVs or newly introduced UAV systems.