Open AccessGPS Time and Frequency Transfer: PPP and Phase-Only Analysis
Author(s) -
Pascale Defraigne,
Nicolas Guyen,
Carine Bruyninx
Publication year - 2008
Publication title -
international journal of navigation and observation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.176
H-Index - 18
eISSN - 1687-6008
pISSN - 1687-5990
DOI - 10.1155/2008/175468
Subject(s) - global positioning system , precise point positioning , time transfer , gps disciplined oscillator , phase (matter) , code (set theory) , atomic clock , computer science , transfer (computing) , assisted gps , gps receiver , geodesy , control theory (sociology) , physics , telecommunications , geography , optics , set (abstract data type) , artificial intelligence , programming language , parallel computing , control (management) , gnss applications , quantum mechanics
To compute precise point positioning (PPP) and precise time transfer using GPS code and phase measurements, a new software named Atomium was developed by the Royal Observatory of Belgium. Atomium was also adapted to perform a phase-only analysis with the goal to obtain a continuous clock solution which is independent of the GPS codes. In this paper, the analysis strategy used in Atomium is described and the clock solutions obtained through the phase-only approach are compared to the results from the PPP mode. It is shown that the phase-only solution improves the stability of the time link for averaging times smaller than 7 days and that the phase-only solution is very sensitive to the station coordinates used. The method is, however, shown to perform better than the IGS clock solution in case of changes in the GPS receiver hardware delays which affects the code measurements
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