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タイトル: 精密に制御された電磁波を用いた3次元精密構造探査のためのディジタル信号波形の設計
その他のタイトル: Waveform of Digital Signal for a 3-D Electric Structure Sounding Using Accurately Controlled Electromagnetic Waves
著者: 横山, 由紀子
熊澤, 峰夫
國友, 孝洋
中島, 崇裕
著者(別言語): Yokoyama, Yukiko
Kumazawa, Mineo
Kunitomo, Takahiro
Nakajima, Takahiro
キーワード: electromagnetic sounding
frequency domain
signal processing
発行日: 2001年3月29日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第75冊第3/4号, 2001.3.29, pp. 375-392
抄録: In order to determine an electric 3-D (three dimensional) structure and monitor its temporal variation, the controlled source technique using electromagnetic wave with multiple frequencies is useful. When the amplitudes and the phases of the electromagnetic waves are accurately controlled, we can measure the transfer function of transmitted and received waves. In order to decrease errors in measurements and analysis, the SNR (signal to noise ratio) should be high and be constant. Digital signals can easily control the SNR, because they have the following merits: the signal can be designed to have 1) narrow frequency band, 2) sharp cut-off frequency, 3) amplitude of frequency response determined from amplitudes of the transfer function and background noise, and 4) phase of frequency response requested for. In actual measurements, the transfer function is first measured using preliminary determined transmitted signal after measuring background noise. Next, the signal is designed using measured transfer function and noise, and the transfer function with a better SNR is obtained.
URI: http://hdl.handle.net/2261/13196
ISSN: 00408972


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