Continuous geodetic time-transfer analysis methods
- 7 August 2006
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- Vol. 53 (7), 1250-1259
- https://doi.org/10.1109/tuffc.2006.1665073
Abstract
We address two issues that limit the quality of time and frequency transfer by carrier phase measurements from the Global Positioning System (GPS). The first issue is related to inconsistencies between code and phase observations. We describe and classify several types of events that can cause inconsistencies and observe that some of them are related to the internal clock of the GPS receiver. Strategies to detect and overcome time-code inconsistencies have been developed and implemented into the Bernese GPS software package. For the moment, only inconsistencies larger than the 20 ns code measurement noise level can be detected automatically. The second issue is related to discontinuities at the day boundaries that stem from the processing of the data in daily batches. Two new methods are discussed: clock handover and ambiguity stacking. The two approaches are tested on data obtained from a network of stations, and the results are compared with an independent time-transfer method. Both methods improve the stability of the transfer for short averaging times, but there is no benefit for averaging times longer than 8 days. We show that continuous solutions are sufficiently robust against modeling and preprocessing errors to prevent the solution from accumulating a permanent bias.Keywords
This publication has 9 references indexed in Scilit:
- Comparison of instrumental and empirical station timing biases for a set of Ashtech Z12T GPS receiversPublished by Institution of Engineering and Technology (IET) ,2004
- Status report of the AIUB-METAS geodetic time transferPublished by Institution of Engineering and Technology (IET) ,2004
- IGS/BIPM pilot project: GPS carrier phase for time/frequency transfer and timescale formationMetrologia, 2003
- Time transfer using GPS carrier phase: error propagation and resultsJournal of Geodesy, 2003
- Continuous time transfer using GPS carrier phaseIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2002
- CONTINUOUS FOUNTAIN CS STANDARD: STABILITY AND ACCURACY ISSUESPublished by World Scientific Pub Co Pte Ltd ,2002
- Absolute Calibration of an Ashtech Z12-T GPS ReceiverGPS Solutions, 2001
- Assessment of GPS carrier-phase stability for time-transfer applicationsIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2000
- Parameter Estimation and Hypothesis Testing in Linear ModelsPublished by Springer Science and Business Media LLC ,1988