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Ku Band Antenna G/T Analysis and Experiment According to Elevation Angle Change

앙각변동에 따른 Ku 밴드 안테나 G/T 분석 및 실험

  • Received : 2017.02.27
  • Accepted : 2017.06.19
  • Published : 2017.07.31

Abstract

In order to maintain communication while the vehicle is moving, satellite azimuth angle and elevation angle correction are needed in real time. The elevation angle correction affects the system G/T according to the variation of the external noise temperature flowing into the antenna. G/T is expressed as a ratio of power gain G to noise temperature T and is an important performance function required for antenna gain design. This paper aims to G/T analysis considering elevation angle change and the establishment of an antenna design procedure. For this purpose, the relationship between elevation angle and brightness temperature including rain attenuation was analyzed according to recommendation ITU-R P.372 radio noise. Next, an antenna was designed based on the analysis results and design procedure was verified by G/T measurement. Through this experiment, G/T according to elevation angle was confirmed, and the minimum antenna gain analysis and design procedure required in the system could be established.

위성 단말기가 차량 이동하면서 통신을 유지하려면 실시간 안테나 방위각과 앙각 보정이 필요하다. 앙각 보정은 안테나에 유입되는 외부 잡음온도 변동을 수반하여 시스템 G/T에 영향을 끼친다. G/T는 안테나이득 G(Gain)와 잡음온도 T(Noise temperature)의 비율로 표현되며, 안테나 이득설계에 필요한 중요 성능지수이다. 본 논문은 앙각변동을 고려한 G/T 분석 및 안테나 설계절차 수립을 목표로 한다. 이를 위해 ITU-R P.372 Radio Noise 권고사항에 따라 강우감쇠를 포함한 휘도온도와 앙각과의 관계를 분석하였다. 다음에 분석결과를 기반으로 안테나를 제작하여 G/T 측정에 의한 설계절차를 검증하였다. 이 실험을 통해 앙각에 따른 G/T를 확인하였으며, 시스템에서 요구되는 최소 안테나 이득 분석 및 설계절차를 수립할 수 있었다.

Keywords

References

  1. ITU, Recommendation ITU-R P.372.12 Radio Noise, pp. 1-7, 2015.
  2. ITU, Handbook on Satellite Communications Third Edition, Wiley, pp. 53, 496-503, 2002.
  3. 이해선, "위성통신 이론 및 시스템", 복두출판사, p. 114, 2014.
  4. ITU, Recommendation ITU-R P.618.12 Propagation Data and Prediction Methods Required for the Design of Earthspace Telecommunication Systems, pp. 5-8, 2015.
  5. ITU, Recommendation ITU-R P.839.4 Rain Height Model for Prediction Methods, p. 1, 2013.
  6. ITU, Recommendation ITU-R SM.1448 Determination of the Coordination Area around an Earth Station in the Frequency Bands between 100 MHz and 105 GHz, pp. 38-45, 2000.
  7. ITU, Recommendation ITU-R P838-3 Specific Attenuation Model for Rain for Use in Prediction Methods, pp. 1-8, 2005.
  8. Dennis Roddy, Satellite Communications Third Edition, McGraw-Hill Companies, pp. 311-332, 2001.
  9. Christian Ho, Stephen Slobin and Kelly Gritton, Atmospheric Noise Temperature Induced by Clouds and Other Weather Phenomena at SHF Band, California Institute of Technology, pp. 29-30,63, 2005.
  10. ITU, Recommendation ITU-R P.840.5 Attenuation due to Clouds and Fog, pp. 1-4, 2012.
  11. iDirect, Link Budget Analysis Guide of iDirect Modem, pp. 8-9, 2009.
  12. 이경순, 구경헌, "다중배열 디지털필터를 이용한 위성비콘 수신기 설계", 한국전자파학회논문지, 27(10), pp. 909-918, 2016년 10월. https://doi.org/10.5515/KJKIEES.2016.27.10.909
  13. SingTel Service Division, ST-2 Technical and Operational Document, pp. 11,18, 2011.
  14. 정보통신산업진흥원, "파라볼라 안테나 시험성적서 (S151124-003)", pp. 1-8, 2015년.
  15. ITU, Handbook Spectrum Monitoring, p. 390, 2011.