Journal ArticleDOI
Gigabit Digital Filter Bank: Digital Backend Subsystem in the VERA Data-Acquisition System
TLDR
The Gigabit Digital Filter Bank (GDFB) as discussed by the authors was developed for the VERA project, which is a project to construct a new Japanese VLBI array dedicated to make a 3D map of our Milky Way Galaxy in terms of high precision astrometry.Abstract:
The VERA terminal is a new data-acquisition system developed for the VERA project, which is a project to construct a new Japanese VLBI array dedicated to make a 3-D map of our Milky Way Galaxy in terms of highprecision astrometry. New technology, a gigabit digital filter, was introduced in the development. The importance and advantages of a digital filter for radio astronomy have been studied as follows: (1) the digital filter can realize a variety of observation modes and maintain compatibility with different data-acquisition systems (Kiuchi et al. 1997 and Iguchi et al. 2000a), (2) the folding noise occurring in the sampling process can be reduced by combination with a higher-order sampling technique (Iguchi, Kawaguchi 2002), (3) and an ideal sharp cut-off bandedge and a flat amplitude/phase responses are approached by using a large number of taps available to use LSI of a large number of logic cells (Iguchi et al. 2000a). We developed the custom Finite Impulse Response filter chips and manufactured the Gigabit Digital Filter Banks (GDFBs) as a digital backend subsystem in the VERA terminal. In this paper, the design and development of the GDFB are presented in detail, and the performances and demonstrations of the developed GDFB are shown.read more
Citations
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Journal ArticleDOI
New Distance and Revised Natures of High-Mass Star Formation in G5.89–0.39
Kazuhito Motogi,Kazuo Sorai,Asao Habe,Mareki Honma,Hideyuki Kobayashi,Hideyuki Kobayashi,Katsuhisa Sato +6 more
TL;DR: In this paper, the authors reported on the astrometric observations of the 22 GHz H2O masers in the high mass star-forming region G5.89-0.39 with VERA (VLBI Exploration of Radio Astrometry).
Journal ArticleDOI
Distance to G14.33-0.64 in the Sagittarius Spiral Arm: H2O Maser Trigonometric Parallax with VERA
Mayumi Sato,Mayumi Sato,Tomoya Hirota,Mark J. Reid,Mareki Honma,Hideyuki Kobayashi,Hideyuki Kobayashi,Kenzaburo Iwadate,Takeshi Miyaji,Katsunori M. Shibata +9 more
TL;DR: In this paper, a trigonometric parallax measurement for the Galactic star forming region G14.33-0.64 with the Japanese VLBI array VERA was performed.
Journal ArticleDOI
Astrometry of Galactic Star-Forming Region Onsala 1 with VERA: Estimation of Angular Velocity of Galactic Rotation at the Sun
Takumi Nagayama,Toshihiro Omodaka,Akiharu Nakagawa,Toshihiro Handa,Mareki Honma,Hideyuki Kobayashi,Noriyuki Kawaguchi,Takeshi Miyaji +7 more
TL;DR: In this article, the authors conducted the astrometry of H2O masers in the Galactic star-forming region Onsala 1 (ON 1) with the VLBI Exploration of Radio Astrometry (VERA).
Journal ArticleDOI
VLBI Monitoring of 3C 84 (NGC 1275) in Early Phase of the 2005 Outburst
Hiroshi Nagai,Kenta Suzuki,Keiichi Asada,Motoki Kino,Seiji Kameno,Akihiro Doi,Makoto Inoue,Jun Kataoka,Uwe Bach,Tomoya Hirota,Naoko Matsumoto,Mareki Honma,Hideyuki Kobayashi,Kenta Fujisawa +13 more
TL;DR: In this article, a 14-epoch Very Long Baseline Interferometry (VLBI) study of the sub-pc scale jet of 3C 84 is presented, where the projected speed of the new component is 0.23c from 2007/297 (2007 October 24) to 2009/114 (2009 April 24).
Journal ArticleDOI
Astrometry of Galactic Star-Forming Region G48.61+0.02 with VERA
Takumi Nagayama,Toshihiro Omodaka,Akiharu Nakagawa,Toshihiro Handa,Mareki Honma,Hideyuki Kobayashi,Noriyuki Kawaguchi,Yuji Ueno +7 more
TL;DR: In this paper, the authors performed the astrometry of H2O masers in the Galactic star-forming region G48.61+0.02 with the VLBI Exploration of Radio Astrometry (VERA).
References
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TL;DR: In this paper, a theory of interferometry and synthesis imaging analysis of the Interferometer Response Geometric Relationships and Polarimetry Antennas and Arrays Response of the receiving system Design of the Analog Receiving System Digital Signal Processing Very-Long-Baseline Interferometry Calibration and Fourier Transformation of Visibility Data Deconvolution, Adaptive Calibrration, and Applications Interferometers Techniques for Astrometry and Geodesy Propagation Effects Van Cittert-Zernike Theorem, Spatial Coherence, and
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Proceedings ArticleDOI
Digital Spectrometers for the Nobeyama 45-m Telescope
Kazuo Sorai,Kazuyoshi Sunada,Sachiko K. Okumura,Iwasa Tetsuro,Atsushi Tanaka,Kazuhito Natori,Hirofumi Onuki +6 more
TL;DR: In this paper, a commercial digital oscilloscope is used as a digitizer for the 25-BEam Array Receiver System (BEARS) of the Nobeyama 45m telescope.
Proceedings ArticleDOI
BEARS. SIS 25-BEam Array Receiver System for the NRO 45-m Telescope.
Kazuyoshi Sunada,Chieko Yamaguchi,Naomasa Nakai,Kazuo Sorai,Sachiko K. Okumura,Nobuharu Ukita +5 more
TL;DR: In this article, the SIS 25-BEam Array Receiver System (BEARS) is described, which is a large focal plane array receiver system for the NRO 45 m telescope.
Journal ArticleDOI
First Fringe Detection with VERA's Dual-Beam System and Its Phase-Referencing Capability
Mareki Honma,T. Fujii,Tomoya Hirota,K. Horiai,Kenzaburo Iwadate,Takaaki Jike,Osamu Kameya,Ryuichi Kamohara,Yukitoshi Kan-ya,Noriyuki Kawaguchi,Hideyuki Kobayashi,Seisuke Kuji,Tomoharu Kurayama,Seiji Manabe,Takeshi Miyaji,Kouichirou Nakashima,Toshihiro Omodaka,Tomoaki Oyama,Satoshi Sakai,Sei-ichiro Sakakibara,Katsuhisa Sato,Tetsuo Sasao,Katsunori M. Shibata,Rie Shimizu,Hiroshi Suda,Yoshiaki Tamura,Hideki Ujihara,Akane Yoshimura +27 more
TL;DR: In this paper, the results of the first dual-beam observations with VERA (VLBI Exploration of Radio Astrometry) were presented, and the results demonstrate the high capability of phase referencing, indicating that it is a promising tool for phase-referencing VLBI astrometry at 10 µas-level accuracy.
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