To the Issue of Frequency Band and Frequency Measurement Accuracy

Igor Yu. Blinov, Yuri S. Domnin, N. Kosheliaevskii

Abstract:	Development of the frequency standards based on cold atoms technology completed epoch of continuous frequency measurements. Atomic microwave frequency standards as well as optical ones operate essentially in the pulse mode. Accuracy of frequency measurements gained in thousand times. In addition, what else changed? Strictly speaking, requirements for accurate frequency measurements have changed. If one produces frequency measurements during limited session duration it is mandatory to take into consideration the initial phase of the wave train. These initial and final phases in case of limiting measurement session duration may influence on the net frequency estimation. Such an influence vanishes to zero when measurement session continuous infinitely. The mentioned reasons are particularly important be-cause of measurements accuracy increased many thousand times and initial and final phase’s effect may dis-tort net result of frequency measurement. To estimate possible frequency biases due to initial and final phase’s effect the presentation proposed model of atomic fountain noises influencing signal phase. Basing on proposed model there was elaborated the fountain equation and algorithm to solve the equation. Presented result of frequency comparisons VNIIFTRI SUF02 fountain standard relative PFS in the BIPM demonstrate good coincidence - 3.6×10-17±8×10-17 for the period of 2014-2016. For later period after changing microwave source signal from H-maser 403818 to 403853 figures are somewhat worth. Practical application of proposed approach to process phase’s effect and elaborated algorithm resulted in SUCsF02 fountain accuracy improvement up to about 1×10-16. Taking into consideration microwave signal phase processing enables achieving accuracy level up to limiting level about a few parts ×10 17. All other frequency sources can’t exceed the given level, because they do not have any control or monitor of noises bias due to the residual phase.
Published in:	Proceedings of the 50th Annual Precise Time and Time Interval Systems and Applications Meeting January 28 - 31, 2019 Hyatt Regency Reston Reston, Virginia
Pages:	112 - 116
Cite this article:	Blinov, Igor Yu., Domnin, Yuri S., Kosheliaevskii, N., "To the Issue of Frequency Band and Frequency Measurement Accuracy," Proceedings of the 50th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, January 2019, pp. 112-116. https://doi.org/10.33012/2019.16768
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