Time Transfer Using GPS Carrier Phase Methods
COLORADO UNIV AT BOULDER DEPT OF AEROSPACE ENGINEERING SCIENCES
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We have conducted several time-transfer experiments using the phase of the GPS carrier rather than the code, as is done in current GPS-based time transfer systems. We used data from geodetic quality off-the-shelf dual-frequency GPS receivers, where up to 8 satellites can be simultaneously observed. We connected two GPS receivers to two different atomic clocks at NIST. The antennas connected to the receivers were separated by about 40 m. The time difference between the clocks connected to the GPS receivers was estimated using weighted least-squares methods and carrier phase data. These relative clock estimates were then compared with the NIST time-scale system. We find agreement between the two methods of 55-80 picoseconds over periods of a week.
- Navigation and Guidance