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Updated: Jun 17, 2026

Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Development of newly designed VHF interferometer system for observing earthquake-related atmospheric anomalies
Isao Yamamoto1, Hironobu Fujiwara, Masashi Kamogawa
1Department of Information and Computer Engineering, Okayama University of Science, Okayama, Japan.
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.
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