著者
Isao YAMAMOTO Hironobu FUJIWARA Masashi KAMOGAWA Atsushi IYONO Valeri KROUMOV Takashi AZAKAMI
出版者
日本学士院
雑誌
Proceedings of the Japan Academy, Series B (ISSN:03862208)
巻号頁・発行日
vol.85, no.10, pp.485-490, 2009 (Released:2009-12-14)
参考文献数
7
被引用文献数
2 2

Temporal correlation between atmospheric anomalies and earthquakes has recently been verified statistically through measuring VHF FM radio waves transmitted beyond the line-of-sight. In order to locate the sources of such atmospheric anomalies, we developed a VHF interferometer system (bistatic-radar type) capable of finding the arrival direction of FM radio waves scattered possibly by earthquake-related atmospheric anomalies. In general, frequency modulation of FM radio waves produces ambiguity of arrival direction. However, our system, employing high-sampling rates of the order of kHz, can precisely measure the arrival direction of FM radio waves by stacking received signals.(Communicated by Seiya UYEDA, M.J.A.)