• 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 ...
    • 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
    • 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

      Takiguchi, H; Koyama, Y; Ichikawa, R; Ishii, A; Hobiger, T; Hosokawa, M (Japan Society of Applied Physics (JSAP), 2008)
      原子泉型周波数標準器及び光周波数標準器の開発が世界各国で進められているが,このような 高精度の周波数標準器を比較する新しい時刻比較技術の開発も必要である.宇宙測地技術のひ とつであるVLBI は,遥か彼方の天体から放射される電波を,複数のアンテナで受信し,その 到達時間の差(遅延時間)を精密に計測している.解析では,遅延時間を各種物理パラメータと, 局の位置,速度,大気遅延と共に,基準局に対する観測局のクロックオフセットを未知パラメ ...
    • 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 and Frequency Transfer (from the JGU meeting, 2008)

      Takiguchi, H; Koyama, Y; Ichikawa, R; Ishii, A; Hobiger, T; Hosokawa, M (Japan Geoscience Union, 2008)
      Modern cold-atom-based frequency standards have already archived the uncertainty of 10−15 at a few days. Moreover coldatom- based optical clocks have the potential to realize the uncertainty of from 10−16 to 10−17 level ...