Identification of BDS Satellite Clock Periodic Signals Based on Lomb-Scargle Power Spectrum and Continuous Wavelet Transform

Onboard satellite clocks are the basis of Global Navigation Satellite Systems (GNSS) operation, and their revolution periods at level 2 per day (about 12 h) in case Medium Earth Orbit (MEO) satellites. In this work, authors analysed entire BeiDou System (BDS) space segment (BDS-2 BDS-3) terms occurrence periodic, repetitive signals clock products, checked if they coincide with orbital or multiples. The Lomb-Scargle (L-S) power spectrum was used as a tool to determine present BDS allowing for analyses based on incomplete input data; case, data were phase jumps outliers removed. addition, continuous wavelet transform (CWT) produce time−frequency representation showing more complex behaviour products. As shown geostationary geosynchronous inclined orbit satellites, main period 23.935 h, while it 12.887 being h 53 m (12.883 h). Some effects connected reference swapping also visible spectrum. conducted showed that BDS-2 have much higher noise than BDS-3 clocks, meaning number designated is greater, but reliability significantly lower. satellites only been operation very short time, thus first analysis include type data. Moreover, such wide has not carried out date.