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Rainfall Rate Forecasting for Satellite Link Analysis
Luong Ngoc Thuy Dung,Won Sohn 통신위성ㆍ우주산업연구회 2014 한국위성정보통신학회논문지 Vol.9 No.4
위성시스템설계에서는 설계과정이 초기 설계부터 위성발사까지 약 5년 정도 소요되며, 방송위성수명은 15년 이상까지 될 수 있다. 지구의 온난화 현상은 장기적으로 지구상의 강우율을 점점 증가시키는 추세이다. 이러한 강우율 변화를 포용하기 위해서는 위성링크 설계단계에서 20년 후의 강우감쇠까지 고려하여야 한다. 이 논문에서는 위성방송서비스를 위한 미래의 강우율을 고려하기 위해서 예측용 시계열 시스템 모델을 연구하였다. 이 연구를 통하여 미래 20년 동안의 강우율은 지속적으로 증가할 수 있다는 것을 밝혔다. In the satellite system design, the design processes from the initial design to launch take about 5 years and the broadcastingsatellite lifetime goes over 15 years. Furthermore, global warming phenomenon causes rainfall rate to increase more and morein some regions on the earth. Consequently, at the stage of the satellite link design, we need to consider the future rainattenuation over 20 years. In this paper, we investigated a time-series system model for forecasting to consider the futurerainfall rate for the satellite broadcasting service. We found that rainfall rate of the future 20 years is increasing continuously.
Conversion of Rain Rate Cumulative Distributions by Multiple Regression Model
Luong Ngoc Thuy Dung,손원 사단법인 한국위성정보통신학회 2014 한국위성정보통신학회논문지 Vol.9 No.4
At frequencies above 10 GHz, rain is a dominant propagation phenomenon on satellite link attenuation. The prediction ofrain attenuation is based on the point rainfall rate for 0.01 % of an average year with one minute integration time. Mostof available rain data have been measured with 60 minutes integration time, and many researchers have been studying onconverting the rainfall rate data from various integration times to one minute integration time. This paper proposes a newMultiple Regression model for the conversion, and the proposed schemes show better performance than the existing schemes.
Rainfall Rate Forecasting for Satellite Link Analysis
Luong Ngoc Thuy Dung,손원 사단법인 한국위성정보통신학회 2014 한국위성정보통신학회논문지 Vol.9 No.4
In the satellite system design, the design processes from the initial design to launch take about 5 years and the broadcastingsatellite lifetime goes over 15 years. Furthermore, global warming phenomenon causes rainfall rate to increase more and morein some regions on the earth. Consequently, at the stage of the satellite link design, we need to consider the future rainattenuation over 20 years. In this paper, we investigated a time-series system model for forecasting to consider the futurerainfall rate for the satellite broadcasting service. We found that rainfall rate of the future 20 years is increasing continuously.
Conversion of Rain Rate Cumulative Distributions by Multiple Regression Model
Luong Ngoc Thuy Dung,Won Sohn 통신위성ㆍ우주산업연구회 2014 한국위성정보통신학회논문지 Vol.9 No.4
10 GHz 이상의 주파수에서는 강우가 위성링크감쇠의 유력한 전달현상이다. 강우감쇠를 예측하기 위해서는 평균년의 0.01%를 초과하는 1분단위로 누적된 강우율이 필요하다. 대부분의 강우데이터는 60분 누적시간으로 측정되었기 때문에, 강우데이터를 다수의 누적시간으로부터 1분 누적시간으로 변환하는 연구가 많이 수행되었다. 이 논문은 새로운 변환 모델인 다중회기모형을 제안하며, 제안방안은 기존 방안보다 우수한 성능을 보여 주었다. At frequencies above 10 GHz, rain is a dominant propagation phenomenon on satellite link attenuation. The prediction ofrain attenuation is based on the point rainfall rate for 0.01 % of an average year with one minute integration time. Mostof available rain data have been measured with 60 minutes integration time, and many researchers have been studying onconverting the rainfall rate data from various integration times to one minute integration time. This paper proposes a newMultiple Regression model for the conversion, and the proposed schemes show better performance than the existing schemes.
Optimal Configuration of SVC for Satellite Broadcasting Service with Ku/Ka Bands
Luong Ngoc Thuy Dung,손원(Won Sohn) 한국방송·미디어공학회 2010 한국방송공학회 학술발표대회 논문집 Vol.2010 No.11
The study investigated the optimal configuration of SVC (Scalable Video Coding) to apply to the satellite broadcasting service, and compared the performance of the SVC with that of the AVC (Advanced Video Coding). To get the optimal configuration, we analyzed the optimal bit rate allocation between the layers and the optimal scalability which requires the least bit rate for the required PSNR for various kinds of contents using JSVM. As a result of investigation, we found that the optimal bit rate allocation occurs when the bit rate of the base layer is minimum, and the spatial scalability shows the best performance. The performance of SVC is similar to that of AVC for spatial scalability, but it depends on contents.