• Satellite Communications and Space Industry
• /
• v.14 no.1 s.29
• /
• pp.6-14
• /
• 2007

• Journal of Astronomy and Space Sciences
• /
• v.20 no.4
• /
• pp.339-350
• /
• 2003

Engineering qualification model payload for a communications and broadcasting satellite(CBS) was developed by ETRI from May, 2000 to April, 2003. For. the purpose of functional test and verification of the payload, a real-time hardware-in-the-loop(HITL) CBS simulator(CBSSIM) was also developed. We assumed that the spacecraft platform for the CBSSIM is a geostationary communication satellite using momentum bias three-axis stabilization control technique based on Koreasat. The payload hardware is combined with CBSSIM via Power, Command and Telemetry System(PCTS) of Electrical Ground Support Equipment(EGSE). CBSSIM is connected with PCTS by TCP/IP and the payload is combined with PCTS by MIL-STD-1553B protocol and DC harness. This simulator runs under the PC-based simulation environment with Windows 2000 operating system. The satellite commands from the operators are transferred to the payload or bus subsystem models through the real-time process block in the simulator. Design requirements of the CBSSIM are to operate in real-time and generate telemetry. CBSSIM provides various graphic monitoring interfaces and control functions and supports both pre-launch and after-launch of a communication satellite system. In this paper, the HITL simulator system including CBSSIM, communications payload and PCTS as the medium of interface between CBSSIM and communications payload will be described in aspects of the system architecture, spacecraft models, and simulator operation environment.

• Journal of Satellite, Information and Communications
• /
• v.2 no.1
• /
• pp.27-34
• /
• 2007

A mobile satellite broadcasting service including an ancillary terrestrial component (ATC) takes advantage of the satellite's inherent capability to provide broadcast service over global coverage. We consider the downlink transmission concept using ATC with space=time code (STC) for the mobile satellite communication. We do not regard ATC as simply a repeater but consider it as an antenna for STC. First transmission scenarios for an application of STC are represented. Next, we apply STC in the mobile satellite system including ATC and compare the system performance in the proposed architecture of ATC to that in the conventional structure. The simulation results are compared to the conventional downlink transmission concept for the mobile satellite broadcasting service.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.44 no.8
• /
• pp.728-740
• /
• 2016

Korea developed several satellites through government-led satellite development projects, and now operates earth observation satellites of various sensors, science and technology satellites, and communication satellites. Satellites can be utilized in many fields, and Satellite Information, Global Navigation Satellite System, Satellite Communications and Broadcasting, Space Solar Power System are typical application fields. Now that we have developed and operated several satellites, we have to concentrate more efforts on satellite application. In this paper, we reviewed the current states of the technologies of four satellite application fields mentioned above and analyzed the future prospects of them.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.5 no.3
• /
• pp.327-331
• /
• 2010

The 21.4-22.0GHz frequency band is used to broadcast satellite services in Region 1 and Region 3 in frequency distribution area. The use of this frequency band is according to the provision of the resolution 525 of WRC-03, this frequency band broadcasting service system transmits broadband radio-frequency signals. The trend of the Satellite launching plans for an using this frequency band is growing in worldwide. This frequency band requires fairly more transmit power than the Ku-band because of the rain attenuation of this frequency band is very extreme. An appropriable sharing criteria is required for this broadcast service to be operational.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.1775_1776
• /
• 2009

위성을 이용한 통신 및 방송은 양방향 서비스 시대를 맞이하고 있으며, 위성 인프라는 통신망 back-up 개념을 벗어나 이동 휴대 그리고 지상 인프라 구축 및 운영이 어려운 지역 및 시설을 중심으로 광역통신 및 방송의 근간 망 구성으로 나아가고 있고, 재난 방재 및 긴급 복구, 산업 시설 감시 및 측정데이터 모니터링 등 지상 인프라와 상호 보완적인 이중망 또는 기간망으로 활용되고 있다. 한국수자원공사에도 1998년부터 수문관측망 및 감시제어를 포함한 원격 데이터 취득 및 정보제공 등 많은 부분에 위성통신망을 이용하고 있다. 위성통신망의 사용이 10여년이 지난 시점에서 위성통신장비의 내용년수 도래에 따른 시스템 개선과 대체방안이 필요하게 되었으며, 기존의 수위, 우량과 같은 저용량, 저속인 현재의 위성망에 비하여 기술발전 및 데이터의 다양화에 따른 화상, 동영상과 같은 멀티미디어 데이터 등을 전송할 수 있는 대용량, 고속인 위성망 Pilot 시스템을 구축하였으며, 구축된 시스템에 대하여 성능시험을 한 결과를 분석하고자 한다.

• Defense and Technology
• /
• no.11 s.213
• /
• pp.10-19
• /
• 1996

우리나라의 우주활동에 있어서 올해는 중요한 한해였다. 최초의 한국 소유 통신위성인 무궁화위성(KOREASAT)이 위성 통신 서비스를 시작하였고, 세계에서 두번째로 디지털 위성 방송을 시작하였다. 한국이 본격적인 기술개발에 참여한 최초의 실용위성인 다목적실용위성(KOMPSAT)도 '99년 발사를 위한 모든 계획이 순조롭게 진행되어 설계를 마치고 국산화 제작에 들어가고 있다.

• Journal of Satellite, Information and Communications
• /
• v.1 no.1
• /
• pp.1-4
• /
• 2006

Ku band satellite signal repeating technology just altering a polarization of the repeated signal is applicable for any kind of satellite broadcasting service in geographically shadowed area due to high-rise buildings, trees, and so on. This paper focuses on the design of high polarization discrimination antenna satisfying polarization characteristics with respect to field pattern and frequency band. Designed antenna for the enhancement of axial ratio and polarization discrimination characteristic shows good performance for satellite broadcasting service repeating system.

• The Korean Journal of Air & Space Law and Policy
• /
• v.21 no.1
• /
• pp.191-214
• /
• 2006

The right to the spectrum frequency and orbit is required for the broadcasting by satellite, whether the broadcaster might be given any license or authorization for the broadcasting. The reason is that the ITU Convention and Radio Regulation provide very specific and detailed rules regarding the utilization of the frequency spectrum and orbit. Outstanding issue arises as to the implementation process of the rules of international character. Domestic implementation of the Radio Regulation, in the way of letter to letter should be discouraged when the competitiveness of domestic industry vis-a-vis foreign competitor is taken into account.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.5 no.1
• /
• pp.1-7
• /
• 2001

WRC-2000 adopted the Regions 1 and 3 BSS and associated feeder-link Plans as well as the Regions 1 and 3 BSS and associated feeder-link Lists. These Regions 1 and 3 BSS and associated feeder-link Plans provide, in general, each country of Region 1 with 10 digital channels of 27MHZ bandwidth and each country of Region 3 with 12 digital channels of 27MHZ bandwidth. In this study, we summarize the results of associated meetings and analyze the effects of BSS replanning in Korea. We study the effective interference analysis through the review of Radio Regulations and associate Resolution. Furthermore, interference analysis of inter-broadcasting satellite systems will be done with MSPACEG S/W.