Clock Synchronization Using Gps/glonass Carrier Phase

Clock synchronization by means of GPSIGLONASS is proposed. The GPSIGLONASS receivers with the external frequency input interface are used in our system. While the remote OCXO (OvenControlled Crystal Oscillator) clock and the primary H-maser clock are connected to the receivers, the frequency o s e t of the remote clock with respect to the primary clock can be estimated by performing the linear-least-square fit on carrier-phase single-diflerence observables. The proportional controller is adopted in our system for tuning the remote clock in real time. Through the DIA converter, the remote clock is then steered to synchronism with the primary clock. For averaging times of 1 day under the configuration of about a 30-meter baseline, our experimental results show that the accuracy of the remote clock can be improved from about 2 x to about 6 x 10-14, and the stability of the remote clock can be improved from about 2 x to about a few parts in 10". Based on the proposed architecture, the frequency traceability can be achieved. The potential applications include a frequency source system for calibration laboratories, telecommunication networks, and power transmission systems.