GPS carrier phase time transfer using a modified solution model

At NIM, one GPS carrier phase processing method exclusively for time and frequency transfer, GPSTFP, was developed. Using the method, we implemented the CCD and long baseline time and frequency transfer experiments for performance verification. We can acquire the good agreement among P3 results, GPSTFP results, and the ones by the professional GPS processing software. From one day data, the difference between the mean values of P3 and GPSTFP results was less than 0.5 ns and the time stability from the CCD experiment is about 100 ps.