# 2 17-21

УДК 528.2

DOI: https://doi.org/10.36887/2415-8453-2025-1-2

Lukianchenko Iurii,
PhD in Technical Science, Senior Lecturer of Economic Expertise and Land Management Department,
West Ukrainian National University,
https://orcid.org/0009-0005-9203-4316
Lopushanskyi Oleksandr,
PhD in Technical Science Associate Professor of Economic Expertise and Land Management Department,
West Ukrainian National University,
https://orcid.org/0009-0000-9363-2979
Gumennyi Mykhailo,
PhD in Economic Science, Senior Lecturer of Economic Expertise and Land Management Department,
West Ukrainian National University
https://orcid.org/0000-0002-6704-9656
Muzyka Nataliia
PhD in Economic Science, Associate Professor of the Department of Economic Expertise and Land,
West Ukrainian National University
https://orcid.org/ 0000-0002-6019-7795
Tartachynska Zoriana,
PhD in Technical Science, Associate Professor of Economic Expertise and Land Management Department,
West Ukrainian National University
https://orcid.org/0000-0002-5704-6128

Technologies of today are advancing at a rapid pace, requiring increasingly precise means of coordinate measurements. Thus, monitoring the positions of dams, nuclear power plants, skyscrapers, and other precision-engineered structures demands millimeter-level accuracy in coordinate determination, or, in some cases, even greater precision. One of the primary technologies that enables such high-precision measurements is GNSS (Global Navigation Satellite Systems). Typically, satellite ephemerides are determined in a celestial reference frame, while the coordinates of points obtained from GNSS measurements are defined in a terrestrial reference frame, fixed to the Earth’s body. Hence, it is essential to account for the relationship between celestial and terrestrial reference frames. An important component of this relationship, alongside precession and nutation, is the phenomenon of Earth’s polar motion. This phenomenon describes the variation in the position of Earth’s rotation axis within the planet’s body, whereas precession and nutation characterize the motion of the rotation axis in space.The article analyzes time series of polar motion. The trend of the x and y coordinates of polar motion has been calculated. The average direction of the Earth’s rotation axis movement within its body has been determined. Additionally, the average period of the axis rotation and the spherical radius of such rotation over the past decades have been established. Corresponding graphs have been constructed, and the obtained results have been illustrated.

The purpose of the article is to calculate the parameters of polar motion over the past three decades and present the results in the form of clear visual illustrations. This information can be used by researchers in related fields as input data for their studies.

Keywords: Earth’s polar motion, GNSS, time series analysis.

Rеferences

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The article was received 03.01.2025