Title :
GPS carrier phase and precise point positioning time scale comparisons using different software packages
Author :
Feldmann, T. ; Bauch, A. ; Piester, D. ; Esteban, H. ; Palacio, J. ; Galindo, F.J. ; Gotoh, T. ; Maeno, H. ; Weinbach, U. ; Schön, S.
Author_Institution :
Phys.-Tech. Bundesanstalt (PTB), Braunschweig, Germany
Abstract :
Precise point positioning (PPP) software combines dual frequency code and phase GPS observation data with precise information about the satellite clocks and orbits provided by the International GNSS Service (IGS). It is also a very interesting method for time metrology. Error sources like tropospherical path delay and site displacements have to be modeled or estimated, while the error induced by the first order ionosphere terms can be canceled due to the usage of both GPS frequencies. In case of long baselines the atmospherical effects dominate. Here the physical correction models become important. In this work we compare several precise point positioning (PPP) software packages and study not only the clock solution but also other estimated parameters like positions and zenith tropospheric zenith path delays in order to find the software that is most suitable for time transfer. Especially the repeatability of the position could be a good indicator for quality. We use Dicom GTR50 time and frequency transfer receivers connected to local time scale realizations on baselines with different lengths.
Keywords :
Global Positioning System; software packages; GPS; International GNSS Service; carrier phase; different software packages; dual frequency code; precise point positioning; satellite clocks; satellite orbits; time scale comparisons; Atmospheric modeling; Clocks; Computer errors; Delay estimation; Frequency estimation; Global Positioning System; Metrology; Orbits; Satellite navigation systems; Software packages;
Conference_Titel :
Frequency Control Symposium, 2009 Joint with the 22nd European Frequency and Time forum. IEEE International
Conference_Location :
Besancon
Print_ISBN :
978-1-4244-3511-1
Electronic_ISBN :
1075-6787
DOI :
10.1109/FREQ.2009.5168154