Monitoring method of Earth's center of mass, figure pole and various rotational dynamics parameters

doi:10.11947/j.AGCS.2025.20250141

Abstract

Abstract:

The Earth's center of mass and figure pole are geodetic datum for describing and measuring the rotation of the Earth. The inability to accurately measure mass redistribution within the Earth's interior and geomaterial motion results in more uncertainties in geophysical excitations estimated from geophysical fluid data, thereby limiting in-depth investigations into the rotational dynamics of the Earth. In this paper, various geodetic measurements and Earth rotation motion are unified in an only Earth-fixed reference system, and the effects of Earth's figure polar shift and rotation variation on various geodetic elements are investigated. And then a time-synchronized monitoring methodology for Earth's figure pole and various rotational dynamic parameters is present by multi-geodetic collaboration, which can provide more favorable scientific and technological conditions for the in-depth study of the excitation dynamics mechanism of the Earth's rotation and the interaction of the Earth's spheres. The paper presents the following main results. ① The theoretical method for positioning of Earth's center of mass and figure pole is derived by space geometric and physical geodetic collaboration, which can not only accurately measure the variation time series of Earth's center of mass and figure pole, but also position and orient the current terrestrial reference system to the mean center of mass and mean figure pole in a specified time period. ② This paper presents the monitoring algorithms of the Earth's center of mass, figure pole and various rotational dynamics parameters by collaborating with the Earth's satellite observation, VLBI kinematics measurement, and the site's radial placement and gravity variation observations, which can improve the constraints of the study on the mechanism of the Earth's rotational dynamics.

Key words: terrestrial reference system, Earth's center of mass, Earth's figure pole, Earth's rotation dynamics, multi-geodetic collaboration, geophysical excitations

CLC Number:

P223

Chuanyin ZHANG, Wei WANG, Tao JIANG. Monitoring method of Earth's center of mass, figure pole and various rotational dynamics parameters[J]. Acta Geodaetica et Cartographica Sinica, 2025, 54(7): 1157-1169.

Figures/Tables 5

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级数
m=0	－484.165 143 791
m=1	－0.000 206 616	0.001 384 414
m=2	2.439 383 573	－1.400 273 704