The Calibration Device for TWSTFT station at TL

Huang-Tien Lin, Wen-Hung Tseng, Shinn-Yan Lin, Chia-Shu Liao

Abstract:	Because of the nanosecond time transfer capability of the Two-Way Satellite Time and Frequency Transfer (TWSTFT)[1], it is important to understand the quality of the delay difference between transmission and receiving (Tx/Rx) paths inside TWSTFT earth station. An effective technique using Satellite Simulator to separately calibrate the absolute Tx/Rx delays at each station was developed by VSL (de Jong and Polderman, 1994[2] and TUG (Kirchner et al., 1995[3]). In order to investigate the rigorous calibration method in absolute mode, TL had installed a calibration device, the satellite simulator developed by TimeTech[4], on a Ku-band 1.8 m earth station. By using this device, we performed two serial measurements to obtain the delay values of some internal loops in earth station, and then calculated the difference of the transmission and receiving delays of the TWSTFT earth station. The system structure of the calibration device and the measurement results are illustrated in this paper. The measurement results show that the calibration device at TL is suitable to monitor the change of the Tx/Rx delay difference precisely. In order to have further understanding of the delay measurement of the TWSTFT earth station, more experiments would be performed at TL in the near future.
Published in:	Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting August 29 - 31, 2005 Vancouver, Canada
Pages:	712 - 715
Cite this article:	Lin, Huang-Tien, Tseng, Wen-Hung, Lin, Shinn-Yan, Liao, Chia-Shu, "The Calibration Device for TWSTFT station at TL," Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting, Vancouver, Canada, August 2005, pp. 712-715.
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