- Volume 26 Issue 9
Electromagnetic waves which are emitted from the Sun due to solar flare explosion can cause failures in HF radio communications in the day-side area of the Earth, that is so-call as Radio Blackouts. The international scale representing the severity of the Radio Blackouts is determined by the solar X-ray flux which is measured by United States Geostationary Operational Environmental Satellite. However, the scale is not always applicable to HF communication users in the different area on the Earth, because the HF communication effects depend not only on the X-ray strength but also on the subsolar point location. To solve this problem, we developed a HF radio spectrum monitoring system utilizing a spectrum analyzer. This system conducts a real-time measure of the HF spectrum, and automatically calculates signal to noise ratios and the occurrences of the HF blackouts as comparing with the interference level which is described from the ITU recommendation.
Solar Flare;X-Ray Flux;Radio Blackouts;Radio Spectrum Monitor
- http://www.swpc.noaa.gov/noaa-scales-explantion, "Space weather scale".
- "통신 채널 내 신호의 출현 횟수와 측정 횟수를 기초한 전파 트래픽 산정방법", 특허번호 101185851, 2012 년 9월.
- "전파잡음 측정방법", 국립전파연구원고시 제2012-22 호.
- Recommendation ITU-R P.372, "Radio noise".
- Recommendation ITU-R SM.1753, "Methods for measurement of radio noise".
- Recommendation ITU-R F.339, "Bandwidths, signal-tonoise ratios and fading allowances in HF fixed and land mobile radiocommunication systems".
- 이중근, "도시 전자파 잡음 스펙트럼의 통계적 분석에 관한 연구", 한국전자파학회논문지, 8(2), pp. 207-208, 1997년 4월.