Multiple wall-reflection effect in adaptive-array differential-phase reflectometry on QUEST

Hiroshi Idei, K. Mishra, M. K. Yamamoto, akihide fujisawa, Yoshihiko Nagashima, M. Hamasaki, Y. Hayashi, Takumi Onchi, Kazuaki Hanada, H. Zushi

研究成果: ジャーナルへの寄稿記事

抄録

A phased array antenna and Software-Defined Radio (SDR) heterodyne-detection systems have been developed for adaptive array approaches in reflectometry on the QUEST. In the QUEST device considered as a large oversized cavity, standing wave (multiple wall-reflection) effect was significantly observed with distorted amplitude and phase evolution even if the adaptive array analyses were applied. The distorted fields were analyzed by Fast Fourier Transform (FFT) in wavenumber domain to treat separately the components with and without wall reflections. The differential phase evolution was properly obtained from the distorted field evolution by the FFT procedures. A frequency derivative method has been proposed to overcome the multiple-wall reflection effect, and SDR super-heterodyned components with small frequency difference for the derivative method were correctly obtained using the FFT analysis.

元の言語英語
記事番号C01014
ジャーナルJournal of Instrumentation
11
発行部数1
DOI
出版物ステータス出版済み - 1 13 2016

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Reflectometry
Fast Fourier transform
Fast Fourier transforms
Derivatives
computer programs
Derivative
Phased Array
Antenna phased arrays
Heterodyne
Software
Standing Wave
phased arrays
standing waves
Antenna
Cavity
antennas
cavities

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Mathematical Physics

これを引用

Multiple wall-reflection effect in adaptive-array differential-phase reflectometry on QUEST. / Idei, Hiroshi; Mishra, K.; Yamamoto, M. K.; fujisawa, akihide; Nagashima, Yoshihiko; Hamasaki, M.; Hayashi, Y.; Onchi, Takumi; Hanada, Kazuaki; Zushi, H.

:: Journal of Instrumentation, 巻 11, 番号 1, C01014, 13.01.2016.

研究成果: ジャーナルへの寄稿記事

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abstract = "A phased array antenna and Software-Defined Radio (SDR) heterodyne-detection systems have been developed for adaptive array approaches in reflectometry on the QUEST. In the QUEST device considered as a large oversized cavity, standing wave (multiple wall-reflection) effect was significantly observed with distorted amplitude and phase evolution even if the adaptive array analyses were applied. The distorted fields were analyzed by Fast Fourier Transform (FFT) in wavenumber domain to treat separately the components with and without wall reflections. The differential phase evolution was properly obtained from the distorted field evolution by the FFT procedures. A frequency derivative method has been proposed to overcome the multiple-wall reflection effect, and SDR super-heterodyned components with small frequency difference for the derivative method were correctly obtained using the FFT analysis.",
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AU - Idei, Hiroshi

AU - Mishra, K.

AU - Yamamoto, M. K.

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AU - Nagashima, Yoshihiko

AU - Hamasaki, M.

AU - Hayashi, Y.

AU - Onchi, Takumi

AU - Hanada, Kazuaki

AU - Zushi, H.

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