| Zugriffsnummer | 34580 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Use of two traveling GPS receivers for a relative calibration campaign among European laboratories |
| Autor(in); Institution |
Uhrich, P.; LNE-SYRTE, Observatoire de Paris, LNE, CNRS, UPMC, Paris, FRANCE
Rovera, G. D.; LNE-SYRTE, Observatoire de Paris, LNE, CNRS, UPMC, Paris, FRANCE
Chupin, B.; LNE-SYRTE, Observatoire de Paris, LNE, CNRS, UPMC, Paris, FRANCE
Galindo, J.; Real Instituto y Observatorio de la Armada, San Fernando de Cadiz, SPAIN
Esteban, H.; Real Instituto y Observatorio de la Armada, San Fernando de Cadiz, SPAIN
Jaldehag, K.; SP Technical Research Institute of Sweden, Borås, SWEDEN
Rieck, C.; SP Technical Research Institute of Sweden, Borås, SWEDEN
Bauch, Andreas; 4.4, Zeit und Frequenz, PTB-Braunschweig
Polewka, Thomas; 4.4, Zeit und Frequenz, PTB-Braunschweig
Cerretto, G.; Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, ITALY
Fantino, G.; Istituto Nazionale di Ricerca Metrologica (INRIM), Torino, ITALY
Piriz, R.; GMV, Tres Cantos, SPAIN
|
| Quelle/Jahr | 2015 Joint Conference of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum:(2015), 643 - 648 |
| ISBN | 978-1-4799-8866-2 |
| Berichtsnummer | CFP15FRE-ART |
| Verlag | Piscataway, NJ: IEEE |
| Konferenzangaben | 2015 Joint IEEE International Frequency Control Symposium and 29th European Frequency and Time Forum, Denver, Colo., 12-16, April, 2015, USA |
| Freie Schlagworte | GPS ; calibration ; ionosphere free P3 |
| Zusammenfassung | One well-known limiting factor of GPS receiver relative calibration of hardware delays is the stability during the measurement campaign of the traveling equipment against which all local receivers are measured. One way to estimate that stability is to measure the deviation from closure of the traveling equipment with respect to the reference receiver of the campaign, that is the difference in the hardware delays between the start and the end of the campaign. But unexpected events on the traveling receiver delays at a given location might remain unnoticed, introducing that way a bias in the calibration results for this site. The use of two receivers as traveling equipment might help to detect abnormal behavior during the campaign or to study effects not clearly understood yet. We report about a GPS receiver relative calibration campaign, which took place during Autumn 2014 between five European National Measurement Institutes or Designated Institutes: LNE-SYRTE in Observatoire de Paris (OP, Paris, France), where the reference receiver of the campaign was located, ROA (San Fernando, Spain), SP (Borås, Sweden), PTB (Braunschweig, Germany) and INRIM (Torino, Italy). We used as traveling equipment two main units, which have been independently calibrated against the refer-ence receiver of the campaign in OP, both connected to a single antenna plus antenna cable. We kept track of the offset between both traveling units in all the visited sites, and, by using the ionosphere free P3 linear combination of P-Code data based on the BIPM standard (TAIP3), we computed the Common-Views (CV) between both traveling units as shown in Fig. 1. Thanks to a very good stability of the traveling equipment, the instability taken into account in the uncertainty budget computations was finally issued from such an analysis. We obtained expanded uncertainty estimates of about 2 ns (k = 2) for the hardware delays in all visited sites, which is an excellent result. An external validation of the resulting hardware delays is to compare the TAIP3 CV computed with calibrated delays to the time scale differences derived from the UTC – UTC(k) data published by BIPM in its monthly Circular T. Taking into account the fact that the Circular T is mostly based on Two-Way Satellite Time and Frequency Transfer data for the laboratories considered here, we obtained results very close to what was expected. The calibration campaign was made in the frame of the Galileo Time and Geodetic Validation Facility contract between European Space Agency and GMV as industrial prime. |
Zitierung
Uhrich, P., Rovera, G. D., Chupin, B., Galindo, J., Esteban, H., Jaldehag, K., Rieck, C., Bauch, A., Polewka, T., Cerretto, G., Fantino, G., & Piriz, R. (2015). Use of two traveling GPS receivers for a relative calibration campaign among European laboratories. 2015 Joint IEEE International Frequency Control Symposium and 29th European Frequency and Time Forum, Denver, Colo., 12-16, April, 2015, USA.