Frequency stability estimation of Compass On-board clock based on smoothed broadcast ephemeris

Gong, Hang; Yang, Wensheng; Sha, Hai; Wang, Feixue

doi:10.1109/eftf-ifc.2013.6702233

Cited by 2 publications

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Distinct from those studies of GPS and Galileo short-and long-term clock stability, previous investigations of the BDS satellite clocks mainly involve the short-term stability as the number of available ground tracking stations was limited (Hauschild et al 2012a;Montenbruck et al 2013;Steigenberger et al 2013). Besides clock solutions from the operational orbit determination and time synchronization (ODTS) algorithm, clock data using the two-way satellite time and frequency transfer (TWSTFT) method and the one-way carrier phase method have also been analyzed to assess BDS satellite clock stabilities (Gong et al 2012(Gong et al , 2013Han et al 2011). So far, the onboard frequency standards of the BDS satellites have not been extensively characterized.…”

Section: Introductionmentioning

confidence: 99%

Analysis of BDS satellite clocks in orbit

et al. 2015

View full text Add to dashboard Cite

The products of Wuhan University with 5-min sampling are used to analyze the characteristics of BeiDou satellite clocks. Two nanoseconds root-mean-square (RMS) variations are obtained for 1-day quadratic fits in the sub-daily region. The relativistic effects of BDS clocks are also studied. General relativity predicts that linear variation of the semimajor axes of geostationary and inclined geosynchronous satellites causes a quadratic clock drift with a magnitude at the 10 -16 /day level. The observed drift is higher than what general relativity theory would produce. Several periodic terms are found in the satellite clock variations through spectrum analysis. In order to identify the origin of the BDS clock harmonics, a correlation analysis between the period or amplitude of the harmonics and properties of the satellite orbits is performed. It is found that the period of the harmonics is not exactly equal to the orbit period, but rather the ratio of the orbit period to clock period is almost the same as that of a sidereal day to solar day. The BDS clocks obey white frequency noise statistics for intervals from 300 s to several thousands seconds. For intervals greater than 10,000 s, all the BDS satellites display more complex, non-powerlaw behavior due to the effects of periodic clock variations.

show abstract