• Comparison study of VLBI and GPS carrier phase frequency transfer - Part II -

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T (National Institute of Information and Communications Technology (NIICT), 2009)
      To show the frequency stability of local baseline, we carried out long term VLBI experi- ment together with GPS and DMTD measurement. And, we compared the results provided from these three techniques. The results are ...
    • Comparison study of VLBI and GPS carrier phase frequency transfer using IVS and IGS data

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T; Hosokawa, M (National Institute of Information and Communications Technology (NIICT), 2008)
      We compare the frequency transfer pre- cision between VLBI and GPS carrier phase using IVS and IGS observation data in order to confirm the potential of VLBI time and frequency transfer. The results show that VLBI time ...
    • Fully automated VLBI analysis with c5++ for ultra-rapid determination of UT1

      Hobiger, T; Otsubo, T; Sekido, M; Gotoh, T; Kubooka, T; Takiguchi, H (TERRAPUB, 2011)
      VLBI is the only space-geodetic technique which gives direct access to the Earth's phase of rotation, i.e. universal time UT1. Beside multi-baseline sessions, regular single baseline VLBI experiments are scheduled in order ...
    • Inter-comparison study of time and frequency transfer between VLBI and other techniques (GPS, ETS8(TCE), TW(DPN) and DMTD)

      Takiguchi, H; Kimura, M; Kondo, T; Ishii, A; Hobiger, T; Ichikawa, R; Koyama, Y; Takahashi, Y; Nakagawa, F; Nakamura, M; Tabuchi, R; Tsuchiya, S; Hama, S; Gotoh, T; Fujieda, M; Aida, M; Li, T; Amagai, J (International VLBI Service (IVS), 2011)
      We carried out the intercomparison ex- periments between VLBI and other techniques to show the capability of VLBI time and frequency transfer by using the current geodetic VLBI tech- nique and facilities as the summary of ...
    • Intercomparison between VLBI frequency transfer and other techniques

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T; Fujieda, M; Amagai, J; Hosokawa, M (National Institute of Information and Communications Technology (NICT), 2010)
      No abstract
    • Time and frequency transfer using the telecommunication satellites for the long baseline interferometry

      Takiguchi, H; Amagai, J; Gotoh, T; Aida, M; Ichikawa, R; Kondo, T (Geodetic Society of Japan, 2010)
      No abstract.
    • VLBI and GPS carrier phase time and frequency transfer

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T (National Institute of Information and Communications Technology (NICT), 2010)
      As one of the new frequency transfer technique to compare the next highly stable frequency standards, we proposed the geodetic VLBI technique. We evaluated the ability of VLBI frequency transfer by comparison with GPS ...
    • VLBI measurements for frequency transfer

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T; Hosokawa, M (National Institute of Information and Communications Technology (NICT), 2010)
      We carried out the intercomparison experiment between VLBI and GPS to show that VLBI can measure the correct time difference. We produced an artificial delay change by stretching the Coaxial Phase Shifter which was inserted ...
    • VLBI measurements for Frequency Transfer

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T; Hosokawa, M (National Institute of Information and Communications Technology (NICT), 2008)
      We compare the frequency transfer precision between VLBI and GPS carrier phase using IVS and IGS observation data in order to confirm the potential of VLBI time and frequency transfer. The results of the VLBI frequency ...
    • VLBI measurements for time and frequency transfer (from the EFTF forum, 2008)

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T; Hosokawa, M (European Frequency and Time Forum, 2008)
      Modern cold-atom-based frequency standards have already archived the uncertainty of 10-15at a few days. Moreover cold-atom-based optical clocks have the potential to realize the uncertainty of from 10-16 to 10-17 level ...
    • VLBI measurements for time transfer between time and frequency laboratories

      Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T (American Geophysical Union, 2007)
      In the usual geodetic VLBI analysis, clock offsets and their rates of change at participating stations except for the reference station are estimated. The averaged formal error (1σ) of the clock offsets is typically about ...