| Citation: | WANG W B，TANG C P，YANG J H，et al. In-orbit operation characteristics of BDS-3 spaceborne atomic clocks[J]. Journal of Beijing University of Aeronautics and Astronautics，2025，51（5）：1694-1704 （in Chinese） doi: 10.13700/j.bh.1001-5965.2023.0266
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In order to evaluate in-orbit operation characteristics of BeiDou-3 Navigation Satellite System (BDS-3) spaceborne atomic clocks, the broadcast clock offset parameters and precise clock offset data released by the International GNSS Service (IGS) Analysis Center were used to analyze the satellite’s broadcast clock offsets, time-varying characteristics of broadcast clock speed, frequency accuracy, and frequency drift rate. The results indicate that the average error of clock offset parameters of the BDS-3 satellite is about 0.41 m, which is the key factor affecting the precision of the satellite space signal. Furthermore, BDS-3 broadcast clock speed parameters fluctuate frequently, so the spaceborne clocks’ high frequency stability has not been brought into full play. The frequency accuracy of BDS-3 spaceborne clocks is poor, but that of the hydrogen clock of the geostationary orbit (GEO) satellite is high. The frequency drift rate of the BDS-3 spaceborne rubidium clock is larger, resulting in too many frequency modulation times and affecting system availability. BDS-3 hydrogen clock has a lower frequency drift rate and higher long-term stability, which indicates advantages in on-board autonomous time-keeping.
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