Principal Investigator: Kristine Larson
Abstract: The key to accurate time and frequency transfer with carrier phase GPS is the adoption of the geodetic analysis method. This is quite different from common-view GPS, where algorithms have been developed and adopted so that to first order common error sources cancel. In geodetic analysis, the full GPS observable is modeled. Orbit errors are not assumed to cancel - instead the orbits of the satellites are estimated from the data using a global tracking network. Other errors, including the atmospheric delay, are also estimated from the observations. Geodetic carrier phase receivers operate continuously; in principle, timing solutions can be available at high frequencies at no additional cost.
Our recent work is summarized by two papers submitted and reviewed by IEEE:
Some older publications:
Code
We are grateful to NRL for partially supprting our time-transfer research. We are also funded to evaluate time-transfer between the GRACE ultra stable oscillators.