Title :
INTELSAT two-way time transfer experiments among Japan, Korea, and Taiwan
Author :
Engelkemier, B.S. ; Imamura, K. ; Takahashi, F. ; Yoshino, T. ; Chung, Nak Sam ; Liao, Chia-Shu
Author_Institution :
Commun. Res. Lab., Minist. of Posts & Telecommun., Tokyo, Japan
fDate :
4/1/1995 12:00:00 AM
Abstract :
The first two-way time transfer experiments using an INTELSAT Ku-band satellite in eastern Asia in cooperation between the Communications Research Laboratory (CRL, Japan), Korea Research Institute of Standard and Science (KRISS, Korea), and the Telecommunication Laboratory (TL, Taiwan) were carried out during 1992. The CRL-KRISS experiment attained a short term precision of better than 1 ns. The CRL-TL experiment suffered from a low C/N0 ratio which made the short term precision greater than 1 ns. The long term averaged residuals contained a periodic noise signal which we believe was the result of a Doppler shift in the frequency 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
Keywords :
Doppler effect; Doppler shift; measurement standards; random noise; satellite communication; time measurement; 1 ns; CRL; Communications Research Laboratory; Doppler shift; INTELSAT two-way time transfer experiments; Japan; KRISS; Korea; Korea Research Institute of Standard and Science; Ku-band satellite; MITREX compatible modem; TL; Taiwan; Telecommunication Laboratory; eastern Asia; frequency offsets; linear correlation; periodic noise signal; short term precision; Additive noise; Clocks; Delay; Extraterrestrial measurements; Frequency; Laboratories; Modems; Satellites; Time measurement; Transponders;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
