Common-View GPS Time Transfer Accuracy and Stability Results
INTERSTATE ELECTRONICS CORP ANAHEIM CA
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This paper presents the results of time and frequency dissemination research at Interstate Electronics that achieves 10-nanosecond timing accuracy and stability of parts in 1014 over continental baselines. Global Positioning System GPS receiver data is processed by a differential, common--view technique that cancels most of the cardinal errors. We characterize the noise in the GPS data by using multicorner--hat separation-of-variances techniques. These noise values set Kalman smoother parameters for removal of random noise in the common-view data. The dissagreement between various satellite measurements provides a measure of common-view GPS accuracy. We present a summary of the analytical concepts, followed by the results of real-world data processing in common-view tests between InterstateAnaheim and the United States Naval Observatory USNO. The results of side-by-side GPS receiver testing, using the algorithms described here, provide measurements of GPS receiver stability, which can reach levels of 1 nanosecond per sidereal day.
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