Estimation and analysis of geocenter motion using BDS-3 data

doi:10.11947/j.AGCS.2023.20220518

Abstract

Abstract: Accurate estimating of geocenter motion is an essential prerequisite for the establishment of geocenter-based terrestrial reference frame at millimeter level. With the commissioning of BDS-3 system and the increasing of BDS-3 tracking stations, determining geocenter motion by BDS-3 is of great scientific value to building the independent terrestrial reference frame of China. This paper determines geocenter motion based on the BDS-3 observations, investigating the spurious periodic signals in geocenter motion time series and the correlation between geocenter motion and orbital parameters. The results indicate that the discrepancy of geocenter motion between BDS-3 estimates and IGS combinations is at the level of 7 mm for the X and Y components, and is about 21.6 mm for the Z component. The formal errors of geocenter motion parameters are 2.7, 2.8 and 5.3 mm for the X, Y and Z components, respectively. An evident 7 d signal with the amplitude of about 3 mm is detected over the geocenter X and Y components, which is related to the BDS-3 orbit repeat time. Anomalous odd harmoncis of BDS draconitic year are found in the geocenter Z component. Besides, the magnitude of formal errors of the geocenter Z component is closely related to the geometry of satellite orbit planes, showing the variability with periods at 1/2, 1/4 and 1/6 of the draconitic year. When the absolute values of the Sun elevation angle of all the orbital planes are close, the correlation between the geocenter Z component and orbit parameters gets obviously increased, reaching up to 0.8.

Key words: geocenter motion, BDS-3, minimum constraint, draconitic signal, 7 d signal

CLC Number:

P227

GUO Shiwei, SHI Chuang, FAN Lei, WEI Na, ZHANG Tao, FANG Xinqi, ZHOU Linghao. Estimation and analysis of geocenter motion using BDS-3 data[J]. Acta Geodaetica et Cartographica Sinica, 2023, 52(12): 2054-2065.

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