Real-Time Rainfall Detection by Analyzing Singularities of Communications Antenna Radiowave Fluctuations
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- MIZUTANI Tsukasa
- Department of Civil Engineering, School of Engineering, The University of Tokyo
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- INOMATA Kenji
- Mitsubishi Electric,Corp.
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- TSUJITA Wataru
- Mitsubishi Electric,Corp.
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- HONDA Riki
- Graduate School of Frontier Sciences, The University of Tokyo
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- FUJINO Yozo
- Institute of Engineering Innovation, School of Engineering, The University of Tokyo
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- NAGAYAMA Tomonori
- Department of Civil Engineering, School of Engineering, The University of Tokyo
Bibliographic Information
- Other Title
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- 通信用アンテナの電波の乱れの特異性強度の 分析によるリアルタイム降雨検知
- ツウシンヨウ アンテナ ノ デンパ ノ ミダレ ノ トクイセイ キョウド ノ ブンセキ ニ ヨル リアルタイム コウウ ケンチ
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Abstract
As described in this paper, we attempted real-time rainfall detection by analyzing the radiowave fluctuation of leaky coaxial cables (LCX), which are widely used in Japan as communications antennas. Because the radiowavefluctuation of communications antennas caused by rainfall is extremely slight and contaminated by noise, it is almost impossible to detect rainfall directly from that fluctuation. However, we specifically examined discontinuous changes of the signals caused by water droplets adhering to the antenna surface. Then we tried to evaluate the discontinuous characteristics at each signal point by a singularity, which is mathematical index. Using wavelet transform, we estimated the singularities of signal fluctuation measured outdoors. Comparison of the 1-min average of the singularities with the 1-min rainfall intensity revealed a difference in singularities between those occurring with rainfall and without rainfall. Statistical analysis revealed a time variation of singularities using Boxplot method. Results show a significant difference in the singularities of the signals obtained during rainfall to the distribution of the signals during no rainfall. Therefore, it might be possible to detect rainfall in real time by ascertaining differences in the singularities of the radiowave fluctuation of LCX.
Journal
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- JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES
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JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES 27 (5), 208-218, 2014
THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES
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Details 詳細情報について
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- CRID
- 1390282679417146368
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- NII Article ID
- 130004704396
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- NII Book ID
- AN10088049
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- ISSN
- 13492853
- 09151389
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- NDL BIB ID
- 026503934
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed