Prof. Satoru Iguchi Profile

Prof. Satoru Iguchi

at National Astronomical Observatory of Japan

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

A 1–50 MHz short dipole antenna for observing the 21 cm global signal on the Moon

Yasumasa Yamasaki, Takeru Matsumoto, Satoru Iguchi, Toshikazu Onishi, Toru Yamada, Daisuke Yamauchi, Fuminori Tsuchiya, Keitaro Takahashi, Naoki Isobe, Takahiro Iwata, Naoto Usami, Yutaro Sekimoto, Yasuyuki Miyazaki, Takanao Saiki, Osamu Mori, Tetsuo Yoshimitsu

Proceedings Volume 13092, 1309278 (2024) https://doi.org/10.1117/12.3018545

KEYWORDS: Antennas, Reflection, Receivers, Simulations, Dielectrics, Calibration, Absorption, Signal detection, Resistance

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Proceedings Article | 23 August 2024 Presentation + Paper

Presentation + Paper

Lunar meter-wave telescope (TSUKUYOMI) as one of Japanese lunar plans

Satoru Iguchi, Toru Yamada, Yasumasa Yamasaki, Toshikazu Onishi, Daisuke Yamauchi, Fuminori Tsuchiya, Keitaro Takahashi, Takeru Matsumoto, Naoki Isobe, Takahiro Iwata, Naoto Usami, Yutaro Sekimoto, Yasuyuki Miyazaki, Takanao Saiki, Osamu Mori, Tetsuo Yoshimitsu

Proceedings Volume 13092, 130922L (2024) https://doi.org/10.1117/12.3018410

KEYWORDS: Antennas, Calibration, Signal detection, Cosmology, Astronomy, Telescopes, Design, Exoplanets, Spectroscopy, Absorption

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

Low-frequency antenna design to observe the 21 cm global signal from the Dark Ages with the lunar telescope, TSUKUYOMI

Takeru Matsumoto, Yasumasa Yamasaki, Toshikazu Onishi, Satoru Iguchi, Toru Yamada, Daisuke Yamauchi, Fuminori Tsuchiya, Keitaro Takahashi, Naoki Isobe, Takahiro Iwata, Naoto Usami, Yutaro Sekimoto, Yasuyuki Miyazaki, Takanao Saiki, Osamu Mori, Tetsuo Yoshimitsu

Proceedings Volume 13092, 1309279 (2024) https://doi.org/10.1117/12.3018734

KEYWORDS: Antennas, Calibration, Resistance, Design, Capacitance, Simulations, Signal detection, Telescopes, Temperature metrology, Capacitors

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SPIE Journal Paper | 16 February 2023 Open Access

Open Access

Estimating the statistical uncertainty due to spatially correlated noise in interferometric images

Takafumi Tsukui, Satoru Iguchi, Ikki Mitsuhashi, Kenichi Tadaki

JATIS, Vol. 9, Issue 01, 018001, (February 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.1.018001

KEYWORDS: Statistical analysis, Astronomical interferometry, Covariance matrices, Visibility, Astronomy, Interferometry, Image analysis, Statistical modeling, Monte Carlo methods, Data modeling

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Proceedings Article | 2 September 2022 Presentation + Paper

Presentation + Paper

ALMA Band-1 (35-50GHz) receiver: first light, performance, and road to completion

Yau-De Huang, Yuh-Jing Hwang, Chau-Ching Chiong, Hsi-Wei Yen, Patrick Michel Koch, Chi-Den Huang, Bill Liu, Cheng Lin Chen, Jwu Jiun Tsai, Wei-Ling Hsiung, Li-Pin Chi, Chin-Ting Ho, Chao-Chin Wang, Chen Chien, You-Hua Chu, Paul Ho, Francisca Kemper, Oscar Morata, Alvaro Gonzalez, Satoru Iguchi, Yoshi Uzawa, Daisuke Iono, Hiroshi Nagai, John Effland, Kamaljeet Saini, Marian Pospieszalski, Doug Henke, Keith Yeung, Ricardo Finger, Valeria Tapia, Nicolas Reyes, Giorgio Siringo, Gianni Marconi, Rodrigo Cabezas

Proceedings Volume 12190, 121900K (2022) https://doi.org/10.1117/12.2629766

KEYWORDS: Receivers, Optical amplifiers, Radio astronomy, Antennas, Astronomy, Observatories, Cryogenics, Simulation of CCA and DLA aggregates, Roads, Galactic astronomy

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Proceedings Article | 31 August 2022 Poster + Paper

Poster + Paper

Proper evaluation of spatially correlated noise in interferometric images

Takafumi Tsukui, Satoru Iguchi, Ikki Mitsuhashi, Kenichi Tadaki

Proceedings Volume 12190, 121901C (2022) https://doi.org/10.1117/12.2629721

KEYWORDS: Astronomy, Interferometry, Visibility, Fourier transforms, Monte Carlo methods, Statistical analysis, Image analysis, Spatial frequencies, Interference (communication), Optical simulations, Fluctuations and noise

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Proceedings Article | 9 July 2018 Presentation + Paper

Presentation + Paper

Planar superconductor-insulator-superconductor mixer array receivers for wide field of view astronomical observation

W. Shan, S. Ezaki, J. Liu, S. Asayama, T. Noguchi, S. Iguchi

Proceedings Volume 10708, 1070814 (2018) https://doi.org/10.1117/12.2311933

KEYWORDS: Waveguides, Polarization, Antennas, Receivers, Silicon, Bridges, Capacitance, Astronomy, Metals, Resistance

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Proceedings Article | 9 July 2018 Paper

Paper

Overview of the East Asia ALMA development program

S. Asayama, A. Gonzalez, H. Kiuchi, T. Kojima, M. Kroug, W. Shan, G. Kosugi, D. Iono, S. Iguchi

Proceedings Volume 10708, 1070837 (2018) https://doi.org/10.1117/12.2313367

KEYWORDS: Receivers, Software development, Terahertz radiation, Spectroscopy, Observatories, Astronomy, Telescopes, Calibration, Data archive systems, Antennas

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Proceedings Article | 9 July 2018 Paper

Paper

Technical achievements of the ALMA future receiver development program at the National Astronomical Observatory of Japan

A. Gonzalez, T. Kojima, M. Kroug, W. Shan, S. Asayama, D. Iono, T. Noguchi, S. Iguchi

Proceedings Volume 10708, 1070812 (2018) https://doi.org/10.1117/12.2312969

KEYWORDS: Receivers, Waveguides, Superconductors, Telescopes, Heterodyning, Terahertz radiation, Antennas

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Proceedings Article | 9 July 2018 Paper

Paper

Performance of pre-production band 1 receiver for the Atacama Large Millimeter/submillimeter Array (ALMA)

Yau-De (Ted) Huang, Oscar Morata, Patrick Michel Koch, Ciska Kemper, Yuh-Jing Hwang, Chau-Ching Chiong, Paul T. Ho, You-Hua Chu, Chi-Den Huang, Ching-Tang Liu, Fang-Chia Hsieh, Yen-Hsiang Tseng, Chia-Hsiang Yang, Jinn jy Tsay, Tsu Chang, Chin-Ting Ho, Po-Han Chiang, Chih-Cheng Chang, Shou-Ting Jian, Sung-Po Hsu, Chen Chien, Satoru Iguchi, Shin'ichiro Asayama, Daisuke Iono, Alvaro Gonzalez, John Effland, Kamaljeet Saini, Marian Pospieszalski, Doug Henke, Keith Yeung, Ricardo Finger, Valeria Tapia, Nicolas Reyes

Proceedings Volume 10708, 1070833 (2018) https://doi.org/10.1117/12.2310127

KEYWORDS: Receivers, Radio astronomy, Astronomy

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Proceedings Article | 6 July 2018 Paper

Paper

How do we design the interferometric system focused on the analog and digital backend and the correlator for scientifically valuable ALMA developments?

S. Iguchi, A. Gonzalez, T. Kojima, W. Shan, G. Kosugi, S. Asayama, D. Iono

Proceedings Volume 10700, 107002Y (2018) https://doi.org/10.1117/12.2312024

KEYWORDS: Data transmission, Analog electronics, Receivers, Interferometry, Antennas, Astronomy, Telescopes

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Proceedings Article | 10 August 2016 Paper

Paper

The Atacama Large Millimeter/sub-millimeter Array band-1 receiver

Yau De (Ted) Huang, Oscar Morata, Patrick Michel Koch, Ciska Kemper, Yuh-Jing Hwang, Chau-Ching Chiong, Paul Ho, You-Hua Chu, Chi-Den Huang, Ching-Tang Liu, Fang-Chia Hsieh, Yen-Hsiang Tseng, Shou-Hsien Weng, Chin-Ting Ho, Po-Han Chiang, Hsiao-Ling Wu, Chih-Cheng Chang, Shou-Ting Jian, Chien-Feng Lee, Yi-Wei Lee, Satoru Iguchi, Shin'ichiro Asayama, Daisuke Iono, Alvaro Gonzalez, John Effland, Kamaljeet Saini, Marian Pospieszalski, Doug Henke, Keith Yeung, Ricardo Finger, Valeria Tapia, Nicolas Reyes

Proceedings Volume 9911, 99111V (2016) https://doi.org/10.1117/12.2232193

KEYWORDS: Receivers, Optical amplifiers, Radio astronomy, Prototyping, Astronomy, Galactic astronomy, Optical isolators, Cryogenics, Observatories, Carbon monoxide

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Proceedings Article | 27 July 2016 Paper

Paper

Large aperture millimeter/submillimeter telescope: which is more cost-effective, aperture synthesis telescope versus large single dish telescope?

Satoru Iguchi, Masao Saito

Proceedings Volume 9906, 99062T (2016) https://doi.org/10.1117/12.2232022

KEYWORDS: Telescopes, Antennas, Synthetic apertures, Optical instrument design, Receivers, Optical correlators, Analog electronics, Spectroscopy, Cryogenics, Chemical mechanical planarization

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Proceedings Article | 19 July 2016 Paper

Paper

Artificial calibration source for ALMA radio interferometer

Hitoshi Kiuchi, Richard Hills, Nicholas Whyborn, Shinichiro Asayama, Seiichi Sakamoto, Satoru Iguchi, Stuartt Corder

Proceedings Volume 9914, 99142O (2016) https://doi.org/10.1117/12.2232192

KEYWORDS: Continuous wave operation, Polarization, Calibration, Antennas, Receivers, Interferometers, Phase measurement, Interference (communication), Frequency combs, Signal generators

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Proceedings Article | 22 July 2014 Paper

Paper

Development of high-accuracy pointing verification for ALMA antenna

Ayumu Matsuzawa, Masao Saito, Satoru Iguchi, Kouichiro Nakanishi, Hiro Saito

Proceedings Volume 9145, 91451Z (2014) https://doi.org/10.1117/12.2055771

KEYWORDS: Antennas, Velocity measurements, Integrated optics, Error analysis, Wind measurement, Stars, Reliability, Astronomy, Ocean optics, Radio optics

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Pointing performance of a radio telescope antenna is important in radio astronomical observations to obtain accurate intensity of a target source. The pointing errors of the ALMA ACA antenna are required to be better than 0.6 arcsec rss, which corresponds to 1/10 and 1/20 of the field of view of the ALMA ACA 12-m and 7-m antenna at 950 GHz, respectively. The pointing verification measurements of the ACA antenna were performed using an Optical pointing telescope (OPT) mounted on the antenna backup structure at the ALMA Operations Site Facility at 2900m above the sea level. Pointing errors of these OPT measurements contain three different origins; originated from antenna, originated of atmosphere (optical seeing), and originated of OPT itself. In order to estimate pointing errors of the antenna origin, we need to subtract the components of optical seeing and OPT itself accurately, while we need to add components that cannot be measured in the OPT measurements. The ACA antenna verification test report demonstrated that all the ACA 7-m antenna meets pointing specification of ALMA. However, about one-third of datasets, values of estimated optical seeing is larger than measured pointing errors. We re-examined a procedure to estimate optical seeing, by investigating the property of optical seeing from the high-sampling OPT pointing measurements of long tracking a bright star for 15 minutes. Particularly, we examined the relation between optical seeing and sampling rate derived from Kolmogorov PSD. Our analysis indicated that the optical seeing at ALMA site may have been overestimated in the verification test. We present a new relation between optical seeing and sampling rate proportional to average wind velocity during measurement. We used this new relation to derive the optical seeing and as a result the number of datasets becomes half in which the optical seeing is larger than measured pointing errors. As a result, we successfully develop a new verification method of optical seeing that has high reliability.

Proceedings Article | 22 July 2014 Paper

Paper

What are scientifically valuable developments for ALMA enhancement?

Satoru Iguchi, Daisuke Iono

Proceedings Volume 9145, 914520 (2014) https://doi.org/10.1117/12.2055812

KEYWORDS: Spatial resolution, Antennas, Stars, Interferometers, Receivers, Telescopes, Amplifiers, Galactic astronomy, Analog electronics, High angular resolution imaging

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Proceedings Article | 27 September 2012 Paper

Paper

Photonic local oscillator technics for large-scale interferometers

H. Kiuchi, M. Saito, S. Iguchi

Proceedings Volume 8444, 84442O (2012) https://doi.org/10.1117/12.925907

KEYWORDS: Phase measurement, Signal generators, Signal detection, Phase shift keying, Signal processing, Digital filtering, Polarization, Sensors, Oscillators, Fiber Bragg gratings

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Proceedings Article | 24 September 2012 Paper

Paper

Performance highlights of the ALMA correlators

Alain Baudry, Richard Lacasse, Ray Escoffier, John Webber, Joseph Greenberg, Laurence Platt, Robert Treacy, Alejandro Saez, Philippe Cais, Giovanni Comoretto, Benjamin Quertier, Sachiko Okumura, Takeshi Kamazaki, Yoshihiro Chikada, Manabu Watanabe, Takeshi Okuda, Yasutake Kurono, Satoru Iguchi

Proceedings Volume 8452, 845217 (2012) https://doi.org/10.1117/12.925700

KEYWORDS: Optical correlators, Antennas, Field programmable gate arrays, Spectral resolution, Fused deposition modeling, Astronomy, Time division multiplexing, Adaptive optics, Receivers, Polarization

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Proceedings Article | 17 September 2012 Paper

Paper

Atacama compact array antennas

M. Saito, J. Inatani, K. Nakanishi, H. Saito, S. Iguchi

Proceedings Volume 8444, 84443H (2012) https://doi.org/10.1117/12.926987

KEYWORDS: Antennas, Holography, Received signal strength, Reflectors, Error analysis, Electroluminescence, Telescopes, Stars, Fast packet switching, Metrology

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Proceedings Article | 17 September 2012 Paper

Paper

Very large millimeter/submillimeter array toward search for 2nd Earth

Satoru Iguchi, Masao Saito

Proceedings Volume 8444, 84443I (2012) https://doi.org/10.1117/12.927119

KEYWORDS: Planets, Antennas, Receivers, Spatial resolution, Stars, Astronomy, Telescopes, Radio telescopes, Atmospheric modeling, Optical instrument design

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Proceedings Article | 3 July 2000 Paper

Paper

Experiment of real-time space VLBI by VSOP

Hideyuki Kobayashi, Noriyuki Kawaguchi, Kenta Fujisawa, Satoru Iguchi, Hisao Uose, Sotetsu Iwamura, Takashi Hoshino, Y. Murata, Hisashi Hirabayashi

Proceedings Volume 4015, (2000) https://doi.org/10.1117/12.390447

KEYWORDS: Space telescopes, Satellites, Optical correlators, Radio telescopes, Telescopes, Oscillators, Optical networks, Observatories, Optical fibers, Magnetism

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Proceedings Article | 3 July 2000 Paper

Paper

Gigabit digital filter for radio astronomy observations

Kazuyuki Kawakami, Kensuke Ozeki, Noriyuki Kawaguchi, Satoru Iguchi, Tamio Hashimoto

Proceedings Volume 4015, (2000) https://doi.org/10.1117/12.390463

KEYWORDS: Digital filtering, Filtering (signal processing), Finite impulse response filters, Optical filters, Signal to noise ratio, Astronomy, Radio astronomy, Prototyping, Bandpass filters, Data acquisition

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Showing 5 of 22 publications

Conference Committee Involvement (2)

SPIE Astronomical Telescopes + Instrumentation

14 December 2020 | Online Only, United States

SPIE Astronomical Telescopes + Instrumentation

10 June 2018 | Austin, United States

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