Carrier-phase Two-Way Satellite Frequency Transfer over a Very Long Baseline

Abstract

In this paper we report that carrier-phase two-way satellite time and frequency transfer (TWSTFT) was successfully demonstrated over a very long baseline of 9,000 km, established between the National Institute of Information and Communications Technology (NICT) and the Physikalisch-Technische Bundesanstalt (PTB). We verified that the carrier-phase TWSTFT (TWCP) result agreed with those obtained by conventional TWSTFT and GPS carrier-phase (GPSCP) techniques. Moreover, a much improved short-term instability for frequency transfer of $2\times 10^{-13}$ at 1 s was achieved, which is at the same level as previously confirmed over a shorter baseline within Japan. The precision achieved was so high that the effects of ionospheric delay became significant which are ignored in conventional TWSTFT even over a long link. We compensated for these effects using ionospheric delays computed from regional vertical total electron content maps. The agreement between the TWCP and GPSCP results was improved because of this compensation.

References in corpus (3)

• Simultaneous remote transfer of accurate timing and optical frequency over a public fiber network
• Time transfer through optical fibers over a distance of 73 km with an uncertainty below 100 ps
• Direct Comparison of Distant Optical Lattice Clocks at the $10^{-16}$ Uncertainty

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