• Journal of the Korea Institute of Military Science and Technology
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• v.1 no.1
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• pp.219-226
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• 1998

군 위성통신 시스템의 생존성 향상을 위한 대전자전기능 설계기법으로 Dehop/Rehop 중계기를 사용하는 FH-FDMA 위성통신방식 설계구조를 제안하고 성능을 분석하였다. Dehop/Rehop방식은 적의 재밍조건하에서 필수적 통신링크를 보장하는 설계기법으로 Bent-Pipe방식에서의 Power Robbing, Hard-limiter에 의한 소신호 감쇄 등이 거의 없으며 광대역 도약으로 항재밍 능력의 개선이 가능하다. 본 연구에서는 75bps-2048kbps의 LDR/MDR/HDR 데이터 전송이 가능한 중계기 구조를 설계하고, SHF대역에서 도약대역폭에 따른 항재밍 성능분석과 Bent-Pipe방식 대비 Dehop/Rehop방식의 채널별 항재밍 성능분석결과 9-l0㏈내외의 성능개선이 가능함을 보였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.9
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• pp.855-860
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• 2016

This study describes the design and implementation of digital Payload power supply. We materialized the interface of the PLDIU and power supply of a satellite bus, and minimized the potential for the occurrence of such erroneous operation circuit ESD through the WCA of the space environment. We designed a reliable power supply through simulation for a TID according to the vibration generated during the launch and space radiation environment, and found no problem in the function and performance through the test space environment after production.

• Satellite Communications and Space Industry
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• v.2 no.1
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• pp.49-57
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• 1994

• Satellite Communications and Space Industry
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• v.4 no.2
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• pp.13-18
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• 1996

• Satellite Communications and Space Industry
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• v.4 no.2
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• pp.19-33
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• 1996

• Satellite Communications and Space Industry
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• v.4 no.2
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• pp.78-83
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• 1996

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.4
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• pp.393-400
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• 2003

This paper deals with the design and manufacturing technique of EQM(Engineering Qualification Model) of input multiplexer(IMUX) for the Ku-band satellite transponder. Channel dropping method by circulator chain structure is adopted for demultiplexing each channel. External equalizers are attached behind channel filters fur reduction of group delay variation and amplitude variation simultaneously. Both channel filters and equalizers adopted dual-mode technique in design f3r mass and volume reduction. Channel filters are designed to have 8-pole elliptic response and equalizers to be of 2-pole reflection type. For good temperature stability characteristics, INVAR36 material is used for channel filters and external equalizers. Vibration test, Thermal Vacuum Test, and EMC test have been performed on input multiplexer and it is shown to be suitable for Ku-band satellite transponder.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.571-573
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• 1998

본 논문에서는 Ka-band을 On Board Processing기술로 이용하는 위성 B-ISDN 중계망을 설계하였다. 지상망과의 연동을 위해 SDH 접속/관리, SSOH처리 방안 등에 대하여 기술하였다. 그리고 설계된 위성 중계망의 성능을 분석하기 위하여 SLAM II를 사용하여 시뮬레이터를 구성하였다. 시뮬레이션연구는 한국 실정을 고려한 Population-Distance-Gross group Product(PDG) 트래픽 모델에 위한 트래픽 값을 적용하였다. 그리고 시뮬레이션 연구 결과를 이용하여 제안된 위성 중계망과 다중 접속 프로토콜의 성능 특성을 고찰하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.3
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• pp.403-410
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• 2003

Design issues of multi-beam satellite transponders have been actively studied. Multi-beam satellite transponders can be used in the first SS/TDMA system for satellite interactive multi-media services in Korea. To be used in SS/TDMA systems, a satellite transponder must have either base-band OBP(On-board Processor) or MSM(Microwave Switching Matrix) on-board switch those are capable to provide inter-connections to many earth stations in different beam coverages or different frequencies, i.e., Ka and Ku band. The use of MSM is considered proper due to a substantial developing cost and the required high techniques in base-band OBP. In this paper, we present a designed scheme of transponder being optimally suitable to the targeted SS/TDMA satellite systems, also analysis the performance.

• Journal of Satellite, Information and Communications
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• v.2 no.2
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• pp.41-47
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• 2007

The first geostationary satellite made by Korea, COMS, has the three different payload ; Meteorological sensor, Oceanographic sensor and Ka-band communication payload. There are Meteorological & Ocean Data Communication Subsystem(MODCS) and Telemetry, Command and Ranging Subsystem(TC&R) as other RF radiation sources. MODCS transmits and receives Meteo and Ocean measurement data from/to earth using L-band and TC&R using S-band. The Ka-band communication payload will provide high-speed multimedia services and communication services for natural disaster such as prediction, prevention, and recovery services in the government communications network.Ka-band beacon is for the earth antenna pointing and the experiment of rain fading. This paper gives the analysis results about the mutual radiation effect on Ka-band communication payload, Ka-band beacon, MODCS and TC&R. Up/Down link power and coupling factor including the geometrical position and distance of antenna, filter rejection and degradation factor due to the different polarization are considered. The results show MODCS and TC&R are compatible for Ka-band communication payload and Ka-band beacon does not interfere with MODCS and TC&R normal operation.