| Zugriffsnummer | 29413 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | TWSTFT calibration involving four sites using a mobile station on a trailer |
| Autor(in); Institution |
Feldmann, Thorsten; TimeTech GmbH, Stuttgart, GERMANY
Balu, Arvind; TimeTech GmbH, Stuttgart, GERMANY
Liu, Shuo; TimeTech GmbH, Stuttgart, GERMANY
Schäfer, Wolfgang; TimeTech GmbH, Stuttgart, GERMANY
Bauch, Andreas; 4.4, Zeit und Frequenz, PTB-Braunschweig
Becker, Jürgen; 4.4, Zeit und Frequenz, PTB-Braunschweig
Piester, Dirk; 4.4, Zeit und Frequenz, PTB-Braunschweig
Achkar, Joseph; Observatoire de Paris (OP/LNE-SYRTE), Paris, FRANCE
Kanj, Amale; Observatoire de Paris (OP/LNE-SYRTE), Paris, FRANCE
Schlunegger, Christian; Federal Institute of Metrology (METAS), Bern-Wabern, SWITZERLAND
Morel, Jacques; Federal Institute of Metrology (METAS), Bern-Wabern, SWITZERLAND
|
| Quelle/Jahr | 2013 Joint UFFC, EFTF and PFM Symposium:(2013), 485 - 491 |
| Availability | [DVD-ROM] ; file name: UFFC2013-001415.pdf |
| ISBN | 978-1-4673-5686-2 |
| Verlag | Piscataway, NJ: IEEE |
| Konferenzangaben | European Frequency and Time Forum ; EFTF 2013, Prague, 21-25, July, 2013, Czech Republic |
| Freie Schlagworte | TWSTFT ; Two-Way Satellite Time and Frequency Transfer ; calibrated time transfer ; time transfer with telecommunication satellites |
| Zusammenfassung | Calibrated time transfer between two remote locations using the Two-Way Satellite Time and Frequency Transfer (TWSTFT) technique with telecommunication satellites requires the accurate knowledge of the internal delays of the equipment involved, the asymmetry between signal paths, and the delays of the connections of the equipment to local time scales. In case of a single satellite transponder used for both signal paths, these delays depend only on the ground equipment, because free space and atmospheric induced delays cancel out in the two-way combination. A single transponder also enables time transfer between two stations located at the same site. The traveling station is operated together with the fixed equipment at each site in a common-clock setup for some days. For each pair of ground sites the differences between the common-clock data reflect the delays of the fixed stations, while ideally the delays associated with the traveling equipment cancel out. In November 2012 the time transfer links between Physikalisch-Technische Bundesanstalt (PTB), Observatoire de Paris (OP/LNE-SYRTE), Swiss Federal Institute of Metrology (METAS), and TimeTech GmbH were calibrated using TimeTech’s mobile TWSTFT calibration station assembled on a trailer. The calibration trailer was firstly introduced at EFTF 2012282. Its stability during the initial calibration campaign was verified by taking common-clock data at TimeTech before and after the trip to the metrology laboratories, and by triangle closures, which are based on the principle that the sum of calibrated links between three sites should be zero within the combined uncertainty. We report on the current status of the calibration station and present the results of the calibration campaign, the uncertainty estimation, and comparisons to previous calibrations. Since the mobile station allows for a standardized and easily executable procedure at each laboratory, the systematic uncertainties are significantly below one nanosecond. |
Zitierung
Feldmann, T., Balu, A., Liu, S., Schäfer, W., Bauch, A., Becker, J., Piester, D., Achkar, J., Kanj, A., Schlunegger, C., & Morel, J. (2013). TWSTFT calibration involving four sites using a mobile station on a trailer. European Frequency and Time Forum ; EFTF 2013, Prague, 21-25, July, 2013, Czech Republic.