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Droste, Stefan; Grebing, Christian; Leute, Julia; Raupach, Sebastian M. F.; Matveev, Arthur; Haensch, Theodor W.; Bauch, Andreas; Holzwarth, Ronald and Grosche, Gesine (2015): Characterization of a 450 km baseline GPS carrier-phase link using an optical fiber link. In: New Journal of Physics, Vol. 17, 083044 [PDF, 1MB]

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A global positioning system (GPS) carrier-phase frequency transfer link along a baseline of 450 km has been established and is characterized by comparing it to a phase-stabilized optical fiber link of 920 km length, established between the two endpoints, the Max-Planck-Institut fur Quantenoptik in Garching and the Physikalisch-Technische Bundesanstalt in Braunschweig. The characterization is accomplished by comparing two active hydrogen masers operated at both institutes. The masers serve as local oscillators and cancel out when the double differences are calculated, such that they do not constitute a limitation for the GPS link characterization. We achieve a frequency instability of 3 x 10(-13) in 30 s and 5 x 10(-16) for long averaging times. Frequency comparison results obtained via both links show no deviation larger than the statistical uncertainty of 6x10(-16). These results can also be interpreted as a successful cross-check of the measurement uncertainty of a truly remote end fiber link.

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