47/48GHz FSS 위성 시스템과의 주파수 공유를 위한 HAPS 지상국의 최대 허용 off-axis e.i.r.p. 레벨 제안 = A Proposal of the Maximum Allowable Off-axis e.i.r.p. Level of HAPS Ground Station for Frequency Sharing with 47/48GHz FSS system

국문 초록 (Abstract)

ITU-R 결의 122는 47/48GHz 대역에서 위성 우주국 수신기와의 주파수 공유를 위해 HAPS 지상국에 대한 전력 제한에 대한 연구를 요구하고 있으며, ITU-R 권고 SF.1481-1에서는 FSS 시스템과의 주파수 공유를 위해 HAPS 지상국의 안테나 방사 패턴의 사이드 로브 특성을 개선하도록 권고하고 있다. 이에 본 논문에서는HAPS 및 GSO FSS 서비스 커버리지간 비현실적인 이격거리를 줄이면서 결의 122에서 요구하고 있는 HAPS 지상국에 대한 전력 제한 및 권고 SF.1481-1의 지상국 안테나 사이드 로브 개선 등을 고려한 지상국의 최대 허용 off-axis e.i.r.p. 레벨을 제안함으로써 HAPS 지상국과 FSS 위성 수신기간의 주파수 공유의 가능성을 보인다.

다국어 초록 (Multilingual Abstract)

Resolution 122 requires to study power limitation applicable for HAPS ground stations to facilitate sharing with space station receivers in 47/48GHz bands. ITU-R Recommendation 1481-1 recommends to improve the side lobe characteristics of HAPS ground station antenna for frequency sharing between FSS system and HAPS system. In this paper, we propose the maximum allowable off-axis e.i.r.p. level of HAPS ground station antennas by considering power limitation to HAPS ground station in Resolution 122, and by improving the side lobe characteristics of HAPS ground station antennas in Recommendation SF.1481-1. The simulation results show that the unfeasible sharing distance between HAPS ground station and FSS earth station can be reduced remarkably, and give the possibility of frequency sharing between two above systems.

참고문헌 (Reference)

1 "Resolution 122, Use of the bands 47.2-47.5GHz and 47.9-48.2GHz by high altitude platform stations(HAPS) in the fixed service and by other services, ITU-R"

2 "ITU-R Recommendation SF. 1481-1, Frequency sharing between systems in the fixed service using high-altitude platform stations and satellite systems in the geostationary orbit in the fixed-satellite service in the bands 47.2-47.5 and 47.9-48.2GHz"

3 "ITU-R Recommendation S.672-4, Satellite antenna radiation pattern for use as a design objective in the fixed-satellite service employing geostationary satellites"

4 "ITU-R Recommendation S.524-8, Maximum permissible levels of off-axis e.i.r.p. density from earth station in geostationary-satellite orbit networks operating in the fixed-satellite service transmitting in the 6GHz, 14GHz and 30GHz frequency bands"

5 "ITU-R Recommendation F.699-6, Reference radiation patterns for line-of-sight radio-relay system antennas for use in coordination studies and interference assessment in the frequency range from 1GHz to about 70GHz"

6 "ITU-R Recommendation F.1500, Preferred characteristics of systems in the fixed service using high altitude platforms operating in the bands 47.2-47.5GHz and 47.9-48.2GHz"