Speaker
Dr
Mamoru Sekido
(National Institute of Information and Communications Technology)
Description
We are developing a new broadband VLBI system, named GALA-V with aim of frequency comparison between atomic time standards over intercontinental distances. The development of broadband GALA-V system is coordinated to be as compatible as possible with the VGOS system. Kashima 34m antenna that had modified Cassegrain optics was enabled to carry out broadband observation with originally developed two types of prototype broadband feeds named IGUANA-H and NINJA. Two ways of data acquisition modes; broad channel mode and narrow channel mode, are employed in the project. Narrow channel mode acquires multiple channels of 32MHz bandwidth, and this mode is compatible with the observation mode developed by MIT Haystack as the ‘NASA proof of Concept’ (PoC) system. Broad channel mode acquires four channels of 1 GHz bandwidth signal. RF Direct sampling technique is applied in this mode as a new approach for broadband observation by using high speed sampler K6/GALAS. This technique has several advantages in precision delay derivation by broadband bandwidth synthesis.
Ishioka 13m VGOS station has constructed by GSI in Japan, and the first broadband observation over 8 GHz bandwidth was successfully performed in early 2015 on Kashima 34m - Ishioka 13m baseline. We have achieved super broadband bandwidth synthesis over 8GHz bandwidth for the first time in the world. The theoretical delay precision has reached about 30 femto seconds in this experiment. This presentation will report about recent progress of the broadband GALA-V developments.
Primary author
Dr
Mamoru Sekido
(National Institute of Information and Communications Technology)
Co-authors
Mr
Eiji Kawai
(National Institute of Information and Communications Technology)
Dr
Hideki Ujihara
(National Institute of Information and Communications Technology)
Dr
Hiroshi Takiguchi
(National Institute of Information and Communications Technology)
Mr
Jun-ichi Komuro
(National Institute of Information and Communications Technology)
Dr
Kazuhiro Takefuji
(National Institute of Information and Communications Technology)
Dr
Ken-ichi Watabe
(AIST, National Metrology Institute of Japan)
Mr
Kenjiro Terada
(National Institute of Information and Communications Technology)
Mr
Kunitaka Namba
(National Institute of Information and Communications Technology)
Mr
Masanori Tsutsumi
(National Institute of Information and Communications Technology)
Ms
Rumi Takahashi
(National Institute of Information and Communications Technology)
Dr
Ryuichi Ichikawa
(National Institute of Information and Communications Technology)
Mr
Shingo Hasegawa
(National Institute of Information and Communications Technology)
Mr
Takatoshi Ikeda
(National Institute of Information and Communications Technology)
Dr
Tetsuro Aoki
(National Institute of Information and Communications Technology)
Dr
Tetsuro Kondo
(National Institute of Information and Communications Technology)
Dr
Tomonari Suzuyama
(AIST, National Metrology Institute of Japan)
Dr
Yasuhiro Koyama
(National Institute of Information and Communications Technology)
Mr
Yoshihiro Fukuzaki
(Geospatial Information Authority of Japan)
Mr
Yoshihiro Okamoto
(National Institute of Information and Communications Technology)
Ms
Yuka Miyauchi
(National Institute of Information and Communications Technology)
Dr
Yuko Hanado
(National Institute of Information and Communications Technology)
