Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Tetsuo Sasao"'
Autor:
Younghee Kwak, Tetsuro Kondo, Jun Amagai, Tadahiro Gotoh, Tetsuo Sasao, Jungho Cho, Tuhwan Kim
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 27, Iss 2, Pp 173-180 (2010)
As a preparatory study for Global Positioning System-Very Long Baseline Interferometry (GPS-VLBI) hybrid system, we examined if VLBI type observation of the GPS signal is realizable through a test experiment. The test experiment was performed betwe
Externí odkaz:
https://doaj.org/article/c749abc27578472e8534b88f8c51f3b1
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 23, Iss 4, Pp 345-354 (2006)
Korean Peninsula has been postulated to be on the Eurasian plate(EU). On the other hand, recent seismological works and GPS researches suggest that it is on a separate plate called the Amurian plate (AM). However, the GPS results are inconsistent wit
Externí odkaz:
https://doaj.org/article/4cc0f9d2ebcf46ef91af0f4bbce9fbba
Autor:
Do-Heung Je, Yong-Woo Kang, Tetsuo Sasao, Soo-Yeon Kim, Do-Young Byun, Moon-Hee Chung, Paul F. Goldsmith, Jungwon Lee, Minkyu Song, Chung Sik Oh, Sang-Sung Lee, Richard Wylde, Jiman Kang, Seog-Tae Han, Seog-Oh Wi
Publikováno v:
Publications of the Astronomical Society of the Pacific. 125:539-547
We have developed a new millimeter wave receiver system with input optics that support simultaneous observations in four bands of 22, 43, 86, and 129 GHz to facilitate calibrating tropospheric phase fluctuations for millimeter-wave VLBI observations.
Autor:
Mamoru Sekido, Jun Amagai, Hiroshi Takiguchi, Ryuichi Ichikawa, Tetsuro Kondo, Tadahiro Gotoh, Tuhwan Kim, Tetsuo Sasao, Jungho Cho, Younghee Kwak
Publikováno v:
Journal of Positioning, Navigation, and Timing. 1:65-75
We carry out an error analysis of 24-hour global positioning system (GPS)-very long baseline interferometry (VLBI) (GV) hybrid observation data. In this paper, we focus on the impacts of broadcast and final orbits on the GPS delays of the GV hybrid o
Autor:
Satoru Iguchi, Kensuke Ozeki, Do-Heung Je, Hideyuki Kobayashi, Tetsuo Sasao, Jae-Hwan Yeom, Noriyuki Kawaguchi, Kazuyuki Kawakami, Bong Won Sohn, Kiyoaki Wajima, Tomoaki Oyama, Tomoharu Kurayama, Jaeheon Kim, Duk-Gyoo Roh, Do-Young Byun, Seog-Tae Han, Se-Jin Oh, Atsushi Miyazaki
Publikováno v:
Publications of the Astronomical Society of Japan. 63:1229-1242
Autor:
Hideyuki Kobayashi, Osamu Kameya, Tetsuo Sasao, Bong Won Sohn, Hyunsoo Chung, Y. K. Choi, Tomoya Hirota, Taehyun Jung
Publikováno v:
Publications of the Astronomical Society of Japan. 63:375-385
We present the results of the first simultaneous dual-frequency phase referencing VLBI observation with VLBI Exploration of Radio Astrometry (VERA). The experiment was designed to simultaneously observe two adjacent VLBI sources at two different freq
Autor:
Jun Amagai, Tetsuo Sasao, Tadahiro Gotoh, Tuhwan Kim, Younghee Kwak, Jung-Ho Cho, Tetsuro Kondo
Publikováno v:
Journal of Astronomy and Space Sciences, Vol 27, Iss 2, Pp 173-180 (2010)
Yaeyama Star ClubAs a preparatory study for Global Positioning System-Very Long Baseline Interferometry (GPS-VLBI) hybrid system, we examined if VLBI type observation of the GPS signal is realizable through a test experiment. The test experiment was
Autor:
Makoto Matsui, Ryuichi Kamohara, Yukitoshi Kan-ya, Tomoaki Oyama, Takeshi Bushimata, Tetsuo Sasao, Chung Sik Oh, Takeshi Miyaji, Yoon Kyung Choi, Kenta Maruyama, Noriyuki Kawaguchi, Seiji Kameno, Yoshiaki Tamura, Katsunori M. Shibata, Mayumi Sato, Seisuke Kuji, Seiji Manabe, Masachika Kijima, Hideyuki Kobayashi, Kazuyoshi Yamashita, Akiharu Nakagawa, Kayoko Nakamura, Tomoya Hirota, Toshihiro Omodaka, Naoko Matsumoto, Takaaki Jike, Hiroshi Imai, Tomoharu Kurayama, Mareki Honma, Mi Kyoung Kim, Kenzaburo Iwadate, Satoshi Sakai, Katsuhisa Sato, Osamu Kameya, Takumi Nagayama, Miyuki Thushima
Publikováno v:
Publications of the Astronomical Society of Japan. 60:1007-1012
We report astrometric observations of H2O masers around the red supergiant VY Canis Majoris (VY CMa) carried out with VLBI Exploration of Radio Astrometry (VERA). Based on astrometric monitoring for 13 months, we successfully measured a trigonometric
Autor:
Takeshi Bushimata, Yoon Kyung Choi, Takaaki Jike, Satoshi Sakai, Mayumi Sato, Hiroshi Imai, Noriyuki Kawaguchi, Seiji Manabe, Valentin Bujarrabal, Kazuyoshi Yamashita, Hideyuki Kobayashi, Seisuke Kuji, Toshihiro Omodaka, Katsunori M. Shibata, Takeshi Miyaji, Osamu Kameya, Tomoya Hirota, Takumi Nagayama, Akiharu Nakagawa, Katsuhisa Sato, Tetsuo Sasao, Yoshiaki Tamura, Ryuichi Kamohara, Tomoaki Oyama, Chung Sik Oh, Yukitoshi Kan-ya, Mi Kyoung Kim, Masachika Kijima, Tomoharu Kurayama, Mareki Honma, Kenzaburo Iwadate
Publikováno v:
Publications of the Astronomical Society of Japan. 60:1023-1029
We present phase-referenced maps of the SiO maser transitions v = 1 J = 1–0 and v = 2 J = 1–0 from the symbiotic stellar system R Aquarii, which hosts an evolved AGB star plus a hot companion. Observations were performed at two epochs: 2004.98 an
Autor:
Takeshi Bushimata, Hideyuki Kobayashi, Osamu Kameya, Akane Yoshimura, Satoshi Sakai, Katsunori M. Shibata, Noriyuki Kawaguchi, Masachika Kijima, Yoshiaki Tamura, Toshihiro Omodaka, Seisuke Kuji, Katsuhisa Sato, Takeshi Miyaji, Takaaki Jike, Tomoharu Kurayama, Ryuichi Kamohara, Mareki Honma, Seiji Manabe, Tomoaki Oyama, Hiroshi Imai, Kenzaburo Iwadate, Tomoya Hirota, Rie Shimizu, Hiroshi Suda, Akiharu Nakagawa, Tetsuo Sasao
Publikováno v:
Publications of the Astronomical Society of Japan. 60:935-950
We present the technique of instrumental delay calibration for the dual-beam system of VLBI Exploration of Radio Astrometry (VERA), namely, the horn-on-dish method, in which artificial noise sources are mounted on the antenna feedome base and a wide-