1. Precise frequency transfer experiments using VLBI and other techniques
- Author
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Takahashi Yasuhiro, Aida Masanori, Kimura Moritaka, Tsuchiya Shigeru, Fujieda Miho, Nakamura Maho, Li Tingyu, Ishii Atsutoshi, Amagai Jun, Hama Shin'ichi, Nakagawa Fumimaru, Tabuchi Ryo, Gotoh Tadahiro, Koyama Yasuhiro, Ichikawa Ryuichi, Kondo Tetsuro, Hobiger Thomas, and Takiguchi Hiroshi
- Subjects
Physics ,business.industry ,Very-long-baseline interferometry ,Global Positioning System ,Time transfer ,Geodetic datum ,Coaxial ,Geodesy ,business ,Telecommunications ,Stability (probability) ,Signal ,Time–frequency analysis - Abstract
We carried out inter-comparison experiments between VLBI, GPS, TWSTFT and DMTD in order to demonstrate that VLBI can measure the correct time difference between Koganei and Kashima, Japan (about 109 km) on August and October of 2010. The frequency stability of VLBI reached up to 5×10−14 at an averaging time of several hundreds seconds and the value surpassed the frequency stability of GPS. In the experiments, we also evaluated the accuracy of each technique by inserting an artificial delay change into the path of the reference signal cable using a coaxial phase shifter. The results reveal that the artificial delay changes measured by VLBI and DMTD show good agreement (within 10 picoseconds). In general the VLBI results match the DMTD results better than GPS does. From these experiments, we confirmed the capability of the geodetic VLBI technique for time transfer application.
- Published
- 2011
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