title: First international two-way satellite time and frequency transfer experiment employing dual pseudo-random noise codes.
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.
authors.affiliation: Telecommunication Laboratories, Chunghwa Telecom Co. Ltd., Taoyuan, Taiwan, R.O.C. whtseng@cht.com.tw
authors.forename: Wen-Hung
authors.initials: WH
authors.lastname: Tseng
authors.forename: Yi-Jiun
authors.initials: YJ
authors.lastname: Huang
authors.forename: Tadahiro
authors.initials: T
authors.lastname: Gotoh
authors.forename: Thomas
authors.initials: T
authors.lastname: Hobiger
authors.forename: Miho
authors.initials: M
authors.lastname: Fujieda
authors.forename: Masanori
authors.initials: M
authors.lastname: Aida
authors.forename: Tingyu
authors.initials: T
authors.lastname: Li
authors.forename: Shinn-Yan
authors.initials: SY
authors.lastname: Lin
authors.forename: Huang-Tien
authors.initials: HT
authors.lastname: Lin
authors.forename: Kai-Ming
authors.initials: KM
authors.lastname: Feng