Clock Synchronization Using GPS/Glonass Carrier Phase; Conference paper

摘要

Clock synchronization by means of GPS/GLONASS is proposed. The GPS/GLONASS receivers with the external frequency input interface are used in our system. While the remote OCXO (Oven- Controlled Crystal Oscillator) clock and the primary H-maser clock are connected to the receivers, the frequency offset of the remote clock with respect to the primary clock can be estimated by performing the linear-least-square fit on carrier-phase single-difference observables. The proportional controller is adopted in our system for tuning the remote clock in real time. Through the D/A 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 10(-9) to about 6 x 10(-14), and the stability of the remote clock can be improved from about 2 x 10(-10) to about a few parts in 10(14). 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.