INTELSAT 2-WAY TIME TRANSFER EXPERIMENTS AMONG JAPAN, KOREA, AND TAIWAN

The first two-way time transfer experiments using an INTELSAT Ku-band satellite in eastern Asia in cooperation between the Communications Re search Laboratory (CRL, Japan), Korea Research Institute of Standard a nd Science (KRISS, Korea), and the Telecommunication Laboratory (TL, T aiwan) were carried out during 1992. The CRL-KRISS experiment attained a short term precision of better than 1 ns. The CRL-TL experiment suf fered from a low C/N-O ratio which made the short term precision great er than 1 ns. The long term averaged residuals contained a periodic no ise signal which we believe was the result of a Doppler shift in the f requency of the signal caused by the relative motion of the satellite. A MITREX compatible modem under development at CRL exhibited a linear correlation with frequency offsets that were similar to the noise in the data.