Research on time-frequency synchronization algorithm and timing device of BDS satellite common-view

The BDS satellite common-view time-frequency synchronization algorithm based on miniature rubidium atomic clock is proposed to address the low frequency stability of the local-clock in the traditional method using temperature compensated crystal oscillators as satellite timing devices. Using a miniature rubidium atomic clock as the local-clock of the satellite timing device, the time difference between the observation time and the initial time of the measurement basic time frame is obtained by modelling and predicting the clock deviation and clock deviation change rate of the local-clock. Combined with the clock deviation change rate, the clock deviation correction amount of the local clock is calculated, and the measurement basic time frame is adjusted to generate and output second pulses, achieving the synchronization of the BDS satellite common-view time-frequency. The miniature rubidium atomic clock satellite timing device is constructed from the perspective of hardware assembly and software design and the performance evaluation is conducted on the frequency stability of the local clock and the synchronization results of the BDS satellite common-view time-frequency. The experimental results show that the algorithm proposed achieves frequency stability of the local clock of the satellite timing device is better than 2.0 ns based on B1I pseudo-range signal, and the synchronization accuracy of BDS satellite common-view time-frequency can reach 17.4 ns. The algorithm and timing device proposed in this paper are effective.