title: Development of newly designed VHF interferometer system for observing earthquake-related atmospheric anomalies.
abstract: 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.
authors.affiliation: Department of Information and Computer Engineering, Okayama University of Science, Okayama, Japan.
authors.forename: Isao
authors.initials: I
authors.lastname: Yamamoto
authors.forename: Hironobu
authors.initials: H
authors.lastname: Fujiwara
authors.forename: Masashi
authors.initials: M
authors.lastname: Kamogawa
authors.forename: Atsushi
authors.initials: A
authors.lastname: Iyono
authors.forename: Valeri
authors.initials: V
authors.lastname: Kroumov
authors.forename: Takashi
authors.initials: T
authors.lastname: Azakami
mesh_terms: D001272:Atmosphere; D055866:Earthquakes; D007368:Interferometry / Q000295:instrumentation* / Q000379:methods*; D011846:Radio Waves; D013696:Temperature; D013997:Time Factors