• Evaluation of a laser-pumped Cs gas-cell frequency standard on geodetic VLBI

      Ishii, A; Ichikawa, R; Takiguchi, H; Kuboki, H; Sekido, M; Koyama, Y; Ohuchi, Y (Geodetic Society of Japan, 2008)
      The laser-pumped Cs gas-cell type atomic frequency standard (hereafter, we called the "Cs gas-cell oscillator") , this was developed in recent years, has a stability between a hydrogen maser oscillator and a Cs beam-type ...
    • 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 ...
    • Ultra-rapid UT1 measurement by e-VLBI

      Sekido, M; Takiguchi, H; Koyama, Y; Kondo, T; Haas, R; Wagner, J; Ritakari, J; Kurihara, S; Kokado, K (Terra Scientific Pub. Co., 2008)
      The latency of UT1 measurement with Very Long Baseline Interferometry (VLBI) has been greatly reduced by using e-VLBI technology. VLBI observations on the baseline formed by the Kashima 34-m and the Onsala 20-m radio ...