Estimation of velocities of Ukrainian GNSS stations in the IGb08 reference frame

Heading: 
Positional and Theoretical Astronomy
Khoda, O
Kinemat. fiz. nebesnyh tel (Online) 2024, 40(5):23-39
https://doi.org/10.15407/kfnt2024.05.023
Language: Ukrainian
Abstract: 

The cumulative solution for GPS weeks 935...1933 (December 7, 1997 — January 28, 2017) was received in the GNSS Data Analysis Centre of the Main Astronomical Observatory NAS of Ukraine after adjustment of 6993 daily normal equation files received as results of the regular processing and the second reprocessing campaign of historical observations. The ADDNEQ2 program of the Bernese GNSS Software ver. 5.2 was used. Before the adjustment the times series of station coordinates received from the mentioned processing were analyzed to find outliers and determine sets of coordinates and velocities. For foreign EPN stations the files prepared by the EUREF Permanent GNSS Network were used (EPN_outliers.lst and EPN_discontinuities.snx respectively). For 233 permanent GNSS stations the 356 sets of coordinates and 256 sets of velocities that correspond them were established. According to the duration of observations the coordinate sets were devided into three groups: 1) less than one year (94 sets), 2) one to three years (92 sets), 3) more than three years (166 sets). Four coordinate sets were excluded from the further analysis. The IGb08 reference frame was realized by applying No-Net-Translation conditions on the coordinates of the IGS Reference Frame stations. The velocities of these stations were heavily constrained (10–9 m/year for each components) that in term of adjustment means a fixing of velocities values. As result, the coordinates and velocities of the Ukrainian and the Eastern European stations in the IGb08 reference frame at epoch 2005.0 were estimated with high precision. The mean repeatabilities for components of station coordinates are 1.69 mm, 1.40 mm, and 3.63 mm for the north, east, and height components respectively.
Keywords: GNSS, IGb08 Reference Frame, permanent stations, station coordinates, station velocities

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References: 

1. Odynets P., Samoilenko O., Yatskiv Ya. (2013) Study of the Earth surface deformations and local ties of astronomy-geodetic instruments at the Crimean geodynamics test area Simeiz - Katzively. Bull. Ukrainian Centre of Determination of the Earth Orientation Parameters. 8. 15-34. (In Russian)

2. Khoda O. (2019). Estimation of coordinates of the Eastern European permanent GNSS stations in the IGb08 reference frame for GPS weeks 1709-1933. Kinematics and Phys. Celest. Bodies. 35 (1). 46-53.
https://doi.org/10.3103/S0884591319010045

3. Khoda O. (2020). The second reprocessing campaign of historical observations in the GNSS data analysis centre of MAO NAS of Ukraine. Kinematics Phys. Celest. Bodies. 36 (5). 243-252.
https://doi.org/10.3103/S0884591320050050

4. Altamimi Z., Collilieux X., Mtivier L. (2011) ITRF2008: an improved solution of the international terrestrial reference frame. J. Geod. 85 (8). 457-473.
https://doi.org/10.1007/s00190-011-0444-4

5. Bernese GNSS Software Version 5.2. (2015) (Eds Dach R., Lutz S., Walser P., Fridez P.). Berne: Astronomical Institute, University of Berne. 894 p.
DOI: 10.7892/boris.72297.

6. Bruyninx C., Legrand J., Fabian A., Pottiaux E. (2019) GNSS metadata and data validation in the EUREF Permanent Network, GPS Solut. 23 (4). Article 106.
https://doi.org/10.1007/s10291-019-0880-9

7. DeMets C., Gordon R.G., Argus D.F., Stein S. (1994) Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions. Geophys. Res. Lett. 21 (20). 2191-2194. DOI: 10.1029/94GL02118.
https://doi.org/10.1029/94GL02118

8. Griffiths J. (2019) Combined orbits and clocks from IGS second reprocessing. J. Geod. 93 (2). 177-195.
https://doi.org/10.1007/s00190-018-1149-8

9. Guidelines for the EPN Analysis Centres. (2022) 10 p. URL: http://epncb.eu/_documentation/guidelines/guidelines_analysis_centres.pdf (Last accessed 22.04.2024).

10. Johnston G., Riddell A., Hausler G. (2017) The International GNSS Service. Teunissen P.J.G., Montenbruck O. (Eds), Springer Handbook of Global Navigation Satellite Systems (1st ed., P. 967-982). Cham, Switzerland: Springer International Publishing.
https://doi.org/10.1007/978-3-319-42928-1

11. Khoda O. (2017) EPN Densification Project: Report of the Main Astronomical Observatory NAS of Ukraine. Presented at the EUREF Analysis Centres Workshop. Brussels (Belgium). URL: http://epncb.eu/_newseventslinks/workshops/ EPNLACWS_2017/pdf/05_EPN_densification/06_MAO.pdf (Last accessed 22.04.2024). DOI: 10.13140/RG.2.2.23477.22243.

12. Rebischung P. (2012) IGb08: an update on IGS08. IGSMAIL-6663.
URL: https://lists.igs.org/pipermail/igsmail/2012/000497.html (Last accessed 22.04.2024).

13. Schmid R. (2012) Igs08_1707.atx: Update including JPSREGANT subtype calibrations & R743. IGSMAIL-6662.
URL: https://lists.igs.org/pipermail/igsmail/2012/000496.html (Last accessed 22.04.2024).

14. Vlksen C. (2017) EPN reprocessing activities: a summary. Presented at the EUREF Analysis Centres Workshop. Brussels (Belgium).
URL: http://epncb.eu/_newseventslinks/workshops/EPNLACWS_2017/pdf/04_ EPN_Reprocessing/voelksen_repro-2017.pdf (Last accessed 22.04.2024).