title: Carrier-phase time transfer.
abstract: 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. Atomic clocks were connected to geodetic GPS receivers; we then used the GPS carrier-phase observations to estimate relative clock behavior at 6-minute intervals. GPS carrier-phase time transfer is more than an order of magnitude more precise than GPS common view time transfer and agrees, within the experimental uncertainty, with two-way satellite time-transfer measurements for a 2400 km baseline. GPS carrier-phase time transfer has a stability of 100 ps, which translates into a frequency uncertainty of about two parts in 10(-15) for an average time of 1 day.
authors.affiliation: Dept. of Aerosp. Eng. Sci., Colorado Univ., Boulder, CO.
authors.forename: K M
authors.initials: KM
authors.lastname: Larson
authors.forename: J
authors.initials: J
authors.lastname: Levine