Reference clock impact on GNSS clock outliers

With the advent of the Global Navigation Satellite System (GNSS), the need for precise and highly accurate orbit and clock products becomes crucial in processing GNSS data. Clocks in GNSS observations form the basis of positioning. Their high quality and stability enable high accuracy and the reliab...

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Bibliographic Details
Published inJournal of applied geodesy Vol. 17; no. 4; pp. 391 - 396
Main Authors Maciuk, Kamil, Nistor, Sorin, Brusak, Ivan, Lewińska, Paulina, Kudrys, Jacek
Format Journal Article
LanguageEnglish
Published Berlin De Gruyter 26.10.2023
Walter de Gruyter GmbH
Subjects
Accuracy
Algorithms
clock
Clocks
Clocks & watches
Data analysis
Global navigation satellite system
Global positioning systems
GPS
Hydrogen masers
jump
Navigation
Navigational satellites
Noise
Noise levels
Orbit determination
outlier
Outliers (statistics)
reference clock
satellite
Satellite navigation systems
Satellite observation
Satellites
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Summary:With the advent of the Global Navigation Satellite System (GNSS), the need for precise and highly accurate orbit and clock products becomes crucial in processing GNSS data. Clocks in GNSS observations form the basis of positioning. Their high quality and stability enable high accuracy and the reliability of the obtained results. The clock modelling algorithms are continuously improved; thus, the accuracy of the clock products is evolving. At present, 8 Analysis Centers (ACs) contribute to the International GNSS Service final clock products. These products are based on GNSS observations on a network of reference stations, where for a given day one of the reference station clocks is the reference clock. In this paper, the authors determined the impact of the reference clock on the quality of clock product, especially outliers, for the first time. For this purpose, the multi-GNSS final clock products provided by the Center for Orbit Determination in Europe (CODE) for the period 2014–2021 (1773–2190 GPS week, 2921 days) were analysed. Analysis shows that by applying the Median Absolute Deviation (MAD) algorithm for outlier detection, the Passive Hydrogen Maser (PHM) clock installed on board the GALILEO satellites have the lowest level of noise, whereas the Block IIR GPS satellite launched in 1999 appears to have the highest levels of noise. Furthermore, the GNSS station OHIE3, when used as a reference clock, generates an increase in the level of noise, especially noticeable on the G09 and E03 satellites.
ISSN:1862-9016
1862-9024
DOI:10.1515/jag-2023-0007