국내 환경에서 위성링크의 실효경로길이 모델링 연구 = Study on the modeling of effective path length in satellite communication link in Korea

다국어 초록 (Multilingual Abstract)

The utilization of millimeter-wave band frequency is steadily increasing to admit the vast amount of data in the high-speed digital communication and broadcasting services. Recently, millimeter-wave satellite systems have been developed quite actively in each country.
In the frequency band above 10 GHz, the rain attenuation is very important. Especially, the accurate prediction of rain attenuation statistics in the satellite link is the crucial part of the system design in the millimeter-wave band. ITU-R recommends a global rain-attenuation prediction model, but quite big error is inevitable when applied to the domestic environment. In the rain-attenuation prediction model, the effective path length is a key parameter which depends on the geological region. The ITU-R model is an experimental model and it lacks the physical meaning because the effective path-length model is frequency dependent.
In this paper, an effective path-length model is proposed, which is adequate for domestic environment. The proposed model is a theoretical model, which is based on the rain-cell concept. The parameters of the model were investigated by analyzing domestic meteorological radar measurement data.
For the verification of proposed model, KOREASAT-5(Ka band) beacon measurement system was built, and the received power level and rain rate were measured. Effective path length was then calculated using the CNU-ADD model for rain attenuation coefficient[27] and the total path loss properly corrected for satellite drift.
The effective path length data obtained from the beacon-signal measurement were compared with the theoretical model developed from the domestic meteorological data for similar rain events. The results shows that the proposed theoretical model and our approach for effective path-length modeling based on the rain cell concept works well. More works on the effective path-length model are under way, utilizing more comprehensive long-term measurement data (received beacon signals and meteorological data).

목차 (Table of Contents)

• 제1장 서 론 1
• 제2장 위성링크 강우감쇠 예측 기술 3
• 제1절 위성링크의 전자파 전파 특성 3
• 제2절 강우입자에 의한 산란 특성 7
• 제3절 강우감쇠 예측 요소기술 16
• 제3장 위성링크 실효경로길이 예측 21
• 제1절 위성링크의 실효경로길이 연구 동향 21
• 제2절 국내 기상청 연구 현황 27
• 제4장 국내 환경에 적합한 실효경로길이 모델 32
• 제1절 강우셀을 이용한 실효경로길이 이론 모델 32
• 제2절 실효경로길이 모델 검증을 위한 시스템 구축 38
• 제3절 기상레이더 측정 데이터를 이용한 강우셀 파라미터 도출 42
• 제4절 실효경로길이 모델 파라미터 도출 및 검증 52
• 제5장 결 론 65
• 참고문헌 67
• Abstract 71