Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Jun Amagai"'
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
Autor:
Jun Amagai, Yoshiya Arakaki
Publikováno v:
IEICE Communications Express. 7:115-119
Autor:
Jun Amagai, Satoshi Yasuda, Tadahiro Goto, Toshio Iguchi, Seiji Kawamura, Kuniyasu Imamura, Shigeo Sugitani, Hiroshi Hanado, R. Ichikawa, Nobuyasu Shiga, Hiroki Ohta, Hironori Iwai, Masayuki K. Yamamoto, Kouta Kido, Miho Fujieda
Publikováno v:
Radio Science. 52:367-377
A method of estimating water vapor (propagation delay due to water vapor) using digital terrestrial broadcasting waves is proposed. Our target is to improve the accuracy of numerical weather forecast for severe weather phenomena such as localized hea
Autor:
Jun Amagai, Tamaki Takahashi, Yasuhiro Takahashi, Satoshi Horiuchi, Miho Fujieda, Maho Nakamura, Ryo Tabuchi, Yukihiro Yahagi, Tadahiro Gotoh, Shin'ichi Hama
Publikováno v:
Navigation. 60:319-324
The National Institute of Information and Communications Technology (NICT) developed the time management system of the first Quasi-Zenith Satellite (QZS-1) in order to monitor the onboard clock as a part of the satellite navigation system. While an o
Autor:
Shin'ichi Hama, Jun Amagai, Yasuhiro Takahashi, Ryo Tabuchi, Fumimaru Nakagawa, M. Nakamura, Shigeru Tsuchiya
Publikováno v:
Metrologia. 50:200-207
The National Institute of Information and Communications Technology (NICT) has developed and tested carrier-phase two-way satellite time and frequency transfer (TWSTFT) as a next-generation technique applicable to greater distances and resulting in h
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 59:2625-2630
We performed measurements of carrier-phase-based two-way satellite time and frequency transfer (TWST-FT) with an A/D sampler and conventional TWSTFT system. We found that an instability resulting from a local signal at the satellite transponder was n
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:
Yuko Hanado, Hideki Narita, Jun Amagai, Hiroyuki Ito, H Takiguchi, Kuniyasu Imamura, Tadahiro Gotoh, Kensuke Matsubara, Fumimaru Nakagawa, Miho Fujieda
Publikováno v:
2016 European Frequency and Time Forum (EFTF).
NICT carried out the first calibration of the GPS link between Koganei and Kobe by using GPS, TWSTFT and Clock Transport (CT). We presented the result of the calibration in EFTF 2015. The differential correction of GPS link by GPS, TWSTFT and CT were
Publikováno v:
Advances in Space Research. 49:1180-1190
Reflected signals of the Global Navigation Satellite System (GNSS) from the sea or land surface can be utilized to deduce and monitor physical and geophysical parameters of the reflecting area. Unlike most other remote sensing techniques, GNSS-Reflec
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