Title :
First international two-way satellite time and frequency transfer experiment employing dual pseudo-random noise codes
Author :
Tseng, Wen-Hung ; Huang, Yi-Jiun ; Gotoh, Tadahiro ; Hobiger, Thomas ; Fujieda, Miho ; Aida, Masanori ; Li, Tingyu ; Lin, Shinn-Yan ; Lin, Huang-Tien ; Feng, Kai-Ming
Author_Institution :
Telecommun. Labs., Chunghwa Telecom Co. Ltd., Taoyuan, Taiwan
fDate :
3/1/2012 12:00:00 AM
Abstract :
Two-way satellite time and frequency transfer (TWSTFT) is one of the main techniques used to compare atomic time scales over long distances. To both improve the precision of TWSTFT and decrease the satellite link fee, a new software-defined modem with dual pseudo-random noise (DPN) codes has been developed. In this paper, we demonstrate the first international DPN-based TWSTFT experiment over a period of 6 months. The results of DPN exhibit excellent performance, which is competitive with the Global Positioning System (GPS) precise point positioning (PPP) technique in the short-term and consistent with the conventional TWSTFT in the long-term. Time deviations of less than 75 ps are achieved for averaging times from 1 s to 1 d. Moreover, the DPN data has less diurnal variation than that of the conventional TWSTFT. Because the DPN-based system has advantages of higher precision and lower bandwidth cost, it is one of the most promising methods to improve international time-transfer links.
Keywords :
Global Positioning System; dual codes; pseudonoise codes; random codes; satellite communication; DPN codes; GPS; Global Positioning System; PPP technique; TWSTFT; atomic time scale; dual pseudo-random noise codes; international two-way satellite time-and-frequency transfer; precise point positioning; satellite link fee; software-defined modem; Delay; Laboratories; Modems; Noise; Satellites; Software; Time frequency analysis;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2012.2224