Analysis on sharing between terrestrial FS and FSS of 40GHz bands, related with HDFSS identification

우리나라 HD-FSS 주파수 분배에 대비한 40GHz 지상망과의 간섭영향 분석

  • Published : 2004.02.01

Abstract

Analysis on sharing between GSO FSS and terrestrial system in the 40㎓ band, related with the problem for sharing between terrestrial services and FSS and identification of HDFSS downlink bands in World Radiocommunication Conference 2003, was practiced by assuming that both systems are operated in Korea. According to results from simulation using the characteristic parameters of GSO FSS and terrestrial FS system in 40 ㎓ described in ITU-R Recommendations, in case that elevation and azimuth angle of antenna of FS station are adjusted to point directly to the geostationary satellite, the GSO system can cause the worst interference to the FS system. This situation is possible to occur in the installation of 40 GHz FS station in urban area where there are high-rise buildings. If high-density FS stations in 40 ㎓ band are operated in the future, interference mitigation techniques to avoid GSO arc should be considered.

2003년 세계전파통신회의(WRC-2003)에서 지상망과 고밀도 고정위성업무(HDFSS:High-Density fixed satellite service)의 주파수 공유 및 HDFSS용 하향링크 후보대역 선정문제로 이슈화된 40 ㎓ 대역에서 정지위성망과 지상망간 주파수 공유에 따른 간섭 영향을 우리나라에서 운용하는 것으로 설정해 분석하였다. 40 ㎓ 대역 정지위성망과 지상망의 전형적인 특성 파라미터를 이용하여 시뮬레이션한 결과, 우리나라 지상 고정업무 무선국의 안테나가 같은 40 ㎓ 대역을 공유하는 정지위성을 향할 경우, 40 ㎓ 지상망의 운용특성들이 맞물려. 간섭을 받을 수 있는 최악의 특정 조건이 이루어질 수 있음을 보았다. 이러한 상황은 고층건물이 밀집된 지역에 지상망을 설치할 때 발생할 수 있으므로. 향후 40 ㎓ 대역의 고밀도 지상고정업무(HDFS :High-Density fixed service) 무선국들이 설치될 때, 정지궤도 지향을 피하는 간섭경감기법이 강구되어야 할 것으로 보인다.

Keywords

References

  1. Rec. ITU-R F.1498-1 Deployment characteristics of the fixed service systems in the band 37-40 GHz for use in sharing studies
  2. 고정위성업무와 타업무간의 공유에 관한 연구(1차년도) 성향숙 (외 4인)
  3. 2002년도 한국통신학회 추계종합학술발표회 논문집 v.26 고밀도고정위성업무(HDFSS)와 지상망간 공유연구 이일용;성향숙
  4. 고정위성업무와 타업무간의 공유에 관한 연구(2차년도) 성향숙 (외 4인)
  5. ITU-R Radio Regulations
  6. Visualyse Professional-Release 13.2 Transfinite Systems Ltd.
  7. Rec. ITU-R S.1328-3 Satellite system charac teristics to be considered in frequency sharing analyses between geostationary satellite orbit(GSO) and non-GSO satellite systems in the fixed-satellite service(FSS0 including feeder links for tje mobile-satellite service(MSS)
  8. Rec. ITU-R S.1557 Operational requirements and minimum characteristics of FSS systems operating in the 50/40 GHz bands for use in sharing studies between the fixed-satellite service and terrestrial services
  9. Rec. ITU-R F1245-1 Mathematical model of average radiation patterns for line-of sight point-to-point radio-relay system antennas for use in certain coordination studies and interference assessment in the frequency range from 1 to about 70 GHz
  10. Rec. ITU-R F.1498-1 Deployment characteristics of fixed service systems in the band 37-40 GHz for use in sharing studies
  11. Rec. ITU-R SF.1484-1 Maximum allowable values of power flux-density at the surface of the Earth produced by non-geostationary satellites in the fixed-satellite service operating in the 37.5-42.5 GHz bands to protect the fixed service
  12. Rec. ITU-R SF.1573 Maximum allowable values of power flux-density at the surface of the Earth produced by geostationary satellites in the fixed-satellite service operating in the 37.5-42.5 GHz bands to protect the fixed service
  13. Rec. ITU-R F.758-2 Considerations in the development of criteria for sharing between the terrestrial fixed service and other services