Abstract
Time is the basis of satellite navigation systems. In precision studies, it is additionally important to ensure accuracy at the highest possible level, up to sub-millimetres. For this purpose, corrections of the clocks of satellites and GNSS reference stations are made available. This type of data is made available in real time in a navigation dispatch with an interval of 10 min–2 h depending on the GNSS system, or in a precision orbit file (interval of 15 min) or in the form of clock correction files (30 s or 300 s). This paper analyses the long-term stability of the clocks of satellites of four GNSS systems. For this purpose, IGS reprocessing data from 1994 to 2020 were used and ADEV (Allan deviation) and three related variances were adopted. The study showed the different nature of the satellite correction for each GNSS system and the increase of the stability over time.
Funding source: MINIATURA 5
Award Identifier / Grant number: 2021/05/X/ST10/00058
Funding source: Akademia Górniczo-Hutnicza im. Stanislawa Staszica
Award Identifier / Grant number: 16.16.150.545
Funding source: Science for Society
Award Identifier / Grant number: NdS/536964/2021/2021
Funding source: AGH University of Science and Technology
Award Identifier / Grant number: Initiative for Excellence Research University
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Author contributions: KM 55 %, KK 35 %, KKP 5 %, YS 5 %.
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Research funding: This work was funded by the National Science Centre as part of MINIATURA 5, application No.2021/05/X/ST10/00058; the Initiative for Excellence Research University grant from AGH University of Science and Technology, by research subvention no. 16.16.150.545 and by program of the Minister of Education and Science (POLAND) called “Science for Society” project number NdS/536964/2021/2021 amount of funding PLN 1,557,100 total value of the project PLN 1,557,100.
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Conflict of interest statement: Authors declare no conflict of interest.
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