Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Shin'ichi Hama"'
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
Autor:
Shoichiro Yokota, Shin'ichi Hama, Yasuhiro Takahashi, Kazuhiro Kimura, Jun Amagai, Miho Fujieda
Publikováno v:
Metrologia. 42(5):344-350
In a manner different from the two-way satellite time and frequency transfer (TWSTFT) via geostationary satellites which has been employed for subnanosecond time transfer between widely separated earth stations, TWSTFT via non-geostationary satellite
Autor:
Shin'ichi Hama, Isao Kawano, Hiroyuki Ito, Miho Fujieda, Takao Morikawa, Satoshi Kogure, Jun Amagai, Shoichiro Yokota, Kazuhiro Kimura, Yasuhiro Takahashi
Publikováno v:
IEEJ Transactions on Electronics, Information and Systems. 125:1209-1216
The Quasi-Zenith satellites System (QZSS) is developed as an integrated satellite service system of communication, broadcasting and positioning for mobile users in specified regions of Japan from high elevation angle. Purposes of the satellite positi
Publikováno v:
IEEJ Transactions on Electronics, Information and Systems. 123:1196-1199
Digital signals on PCB have been kept on being faster and faster. Transmission line simulation is used for an effective way of verification, and built into design flow in recent years. In this article, we introduce the transmission line simulation, a
Autor:
M. Imae, Shin'ichi Hama, Mamoru Sekido, T. Yamamoto, Hitoshi Kiuchi, Tetsuro Kondo, H. Uose, T. Hoshino
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. 38:1290-1297
The Communications Research Laboratory (CRL), Tokyo, Japan, and the Telecommunication Network Laboratory Group, Nippon Telegraph and Telephone Corp., Tokyo, Japan, have developed a highly precise, very long baseline interferometry (VLBI) system using
Publikováno v:
IEE Proceedings - Science, Measurement and Technology. 147:121-126
The Communications Research Laboratory has developed two highly precise VLBI systems using high-speed asynchronous transfer mode (ATM) networks with AAL1 corresponding to the constant bit-rate protocol. Instead of being recorded on magnetic tape, the
Publikováno v:
Electronics and Communications in Japan (Part II: Electronics). 84:40-47
Autor:
Takashi Maruyama, Tadahiro Gotoh, Hiroyuki Noda, Motohisa Kishimoto, Tsutomu Nagatsuma, Yasuhiro Takahashi, Shin'ichi Hama, Thomas Hobiger, Yasuhiro Ohki, Maho Nakamura, Kaoru Nakayama
Publikováno v:
2012 Conference on Precision electromagnetic Measurements.
The Japanese Quasi-Zenith Satellite System (QZSS) offers the possibility to transmit information with an unprecedented bit rate of 2000 bps via the L-band experimental signal. This feature can be used to disseminate Japan Standard Time, i.e., Univers
Autor:
Jun Amagai, Isao Nakazawa, Shin'ichi Hama, Hideki Narita, Yasuhiro Takahashi, M. Aida, Maho Nakamura, Hideki Ujihara
Publikováno v:
2012 European Frequency and Time Forum.
As we designed and constructed the QZSS mobile station, we transported it to Okinawa Electromagnetic Technology Center and Kashima Space Technology Center. At each place we carried out time comparison experiments. This paper describes some results of