Common-View GPS Time Transfer Accuracy and Stability Results. 41st Frequency Control Symposium

This paper presents the results of time and frcq-cxency dissemin:ltion research at Interstate Electronics that achieves 10-nanosecond timing accuracy and stability of parts in loi4 over continental baselines. Global Pot;itionirrg Syate~rl (GPS) receiver data is processed by a differe~ltial, coxnmon--view techxique that caxlcel ~ most of the cardinal errors. We characterize the noise in the GI's data by using multicorner--hat separation-of-variances techniques. These noise values set Kal~nan sxnoother parame-ters for removal of random noise in the rommoxl-view data, l. 2 ~ disagreement betwcen various satellite measurements provides a rncaxlire of common-view GPS accuracy. Wc present a summary of the analytical concepts, followed by the renrllts of real-world data processing in common-view tests hetween hi-erstate/Anahcim ant1 the United States Naval Observatory (USNO). The sesult ~ of side-hy--side GPS receiver testing, using the algorithms described here, provirlc rueasiirements of GPS receiver stability, which can reach Bevels of 1 nanoscco~ld pcr sidercal day. INTRODUCTION- WHAT AND WH