In recent years, many national timing laboratories have collocated geodetic Global Positioning System receivers together with their traditional GPS/GLONASS Common View receivers and Two-Way Satellite Time and Frequency Transfer equipment. Many of these geodetic receivers operate continuously within the International GNSS Service (IGS), and their data are regularly processed by IGS Analysis Centers. From its global network of over 350 stations and its Analysis Centers, the IGS generates precise combined ...
Although carrier-phase observations are thought to drive the accuracy of time and frequency transfer accuracy obtainable using geodetic GPS receivers, there has been evidence of how colored noise on the pseudorange observations reduces the effectiveness of the technique. We present a new parameterization of the GPS pseudorange and carrier-phase observations, called the decoupled-clock model, where a pseudorange bias is estimated for each clock in the system as a white noise ...
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