Scientific Publications
Displaying 1 - 100 of 140
2020
The statistics of computer clocks and the design of synchronization algorithms
Levine J., Journal Of Research Of The National Institute Of Standards And Technology 125, 008 (2020).
2019
Demonstration of a Timescale Based on a Stable Optical Carrier
Milner W., J.M. Robinson, C.J. Kennedy, T. Bothwell, D. Kedar, D.G. Matei, T. Legero, U. Sterr, F. Riehle, H. Leopardi, and T.M. Fortier, Physical Review Letters 123, 173201 (2019).
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2018
Incorporating an Optical Clock Into a Time Scale
Yao J., T.E. Parker, N. Ashby, and J. Levine, Ieee Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 65, 127-134 (2018).
2017
JY1 time scale: a new Kalman-filter time scale designed at NIST
Yao J., T.E. Parker, and J. Levine, Measurement Science And Technology 28, 115004 (2017).
2016
Coordinated Universal Time and the Leap Second
Levine J., Ursi Radio Sci. Bull. 359, 30-36 (2016).
An Algorithm for Synchronizing a Clock When the Data Are Received Over a Network With an Unstable Delay
Levine J., Ieee Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 63, 561-570 (2016).
A Historical Perspective on the Development of the Allan Variances and Their Strengths and Weaknesses
Allan D.W., and J. Levine, Ieee Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 63, 513-519 (2016).
Introduction to the Special Issue on Celebrating the 50th Anniversary of the Allan Variance
Levine J., P. Tavella, and G. Santarelli, Ieee Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 63, 511-512 (2016).
The history of time and frequency from antiquity to the present day
Levine J., The European Physical Journal H (2016).
An Auto-Regressive Moving-Average Time Scale Algorithm (ARMA) for Synchronizing Networked Clocks
Levine J., in (2016).
GPS Jamming and GPS Carrier-Phase Time Transfer
Yao J., M. Weiss, C. Curry, and J. Levine, in (2016).
A Study of GPS Carrier-Phase Time Transfer Noise Based on NIST GPS Receivers
Yao J., and J. Levine, Journal Of Research Of The National Institute Of Standards And Technology 121, 372 (2016).
Usage Analysis of the NIST Internet Time Service
Sherman J.A., and J. Levine, Journal Of Research Of The National Institute Of Standards And Technology 121, 33 (2016).
Long-term GPS carrier-phase time transfer noise: A study based on seven GPS receivers at NIST
Yao J., and J. Levine, in (IEEE, New Orleans, La, Usa, 2016).
2015
A detailed comparison of two continuous GPS carrier-phase time transfer techniques
Yao J., I. Skakun, Z. Jiang, and J. Levine, Metrologia 52, 666-676 (2015).
Toward Continuous GPS Carrier-Phase Time Transfer: Eliminating the Time Discontinuity at an Anomaly
Yao J., J. Levine, and M.A. Weiss, Journal Of Research Of The National Institute Of Standards And Technology 120, 280 (2015).
Comparison of two continuous GPS carrier-phase time transfer techniques
Yao J., I. Skakun, Z. Jiang, and J. Levine, in (IEEE, Denver, Co, Usa, 2015).
2014
An Improvement of RINEX-Shift Algorithm for Continuous GPS Carrier-Phase Time Transfer
Yao J., and J. Levine, in (2014).
International Comparisons of Network Time Protocol Servers
Lombardi M.A., J. Levine, M. Lopez, F. Jiménez, J. Bernard, M. Gertsvolf, H. Sanchez, O.G. Fallas, L.C.H.\ andez Forero, R.J. de Carvalho, and M.N. Fittipaldi, in (2014).
2013
A New Algorithm to Eliminate GPS Carrier-Phase Time Transfer Boundary Discontinuity
Yao J., and J. Levine, in (2013).
Time transfer using a satellite navigation system
Levine J., in (MacGraw, 2013), pp. 363-368.
2012
Invited Review Article: The statistical modeling of atomic clocks and the design of time scales
Levine J., Review Of Scientific Instruments 83, 021101-021128 (2012).
GPS Carrier-Phase Time Transfer Boundary Discontinuity Investigation
Yao J., and J. Levine, in (2012).
Publisher\textquoterights Note: \textquotedblleftInvited Review Article: The statistical modeling of atomic clocks and the design of time scales\textquotedblright [Rev. Sci. Instrum. 83, 021101 (2012)]
Levine J., Review Of Scientific Instruments 83, 129902 (2012).
2011
Timing in telecommunications networks
Levine J., Metrologia 48, S203 - S212 (2011).
2008
Improvements to the NIST network time protocol servers
Levine J., Metrologia 45, S12 - S22 (2008).
Realizing UTC(NIST) at a remote location
Levine J., Metrologia 45, S23 - S33 (2008).
A review of time and frequency transfer methods
Levine J., Metrologia 45, S162 - S174 (2008).
2006
A straightforward frequency-estimation technique for GPS carrier-phase time transfer
Hackman C., J. Levine, T.E. Parker, D. Piester, and J. Becker, Ieee Transactions On Ultrasonics, Ferroelectrics And Frequency Control 53, 1570-1583 (2006).
A Long-term Comparison of GPS Carrier-Phase Frequency Transfer and Two-way Satellite Time/Frequency Transfer
Hackman C., J. Levine, and T.E. Parker, in (2006).
Towards Sub-10-16 Transcontinental GPS Carrier-Phase Frequency Transfer: a Simulation Study
Hackman C., and J. Levine, in (IEEE, Miami, Fl, Usa, 2006).
2004
Adding water vapor radiometer data to GPS carrier-phase time transfer
Hackman C., and J. Levine, in (2004).
Averaging Satellite Timing Data for National and International Time Coordination
Levine J., in (2004).
Coping with Overload on the Network Time Protocol Public Servers
Mills D., J. Levine, R. Schmidt, and D. Plonka, in (2004).
A new technique for estimating frequency from GPS carrier-phase time transfer data
Hackman C., J. Levine, T.E. Parker, D. Piester, and J. Becker, in (IEEE, Montreal, Canada, 2004).
2003
New frequency comparisons using GPS carrier-phase time transfer
Hackman C., and J. Levine, in (IEEE, Tampa, Fl, Usa, 2003).
2002
Time and frequency distribution using satellites
Levine J., Reports On Progress In Physics 65, 1119-1164 (2002).
The algorithm used to realize UTC(NIST)
Levine J., and T.E. Parker, in (IEEE, New Orleans, La, Usa, 2002).
Efficient time transfer using the Internet
Levine J., in (IEEE, New Orleans, La, Usa, 2002).
NIST Computer Time Services: Internet Time Service (ITS), Automated Computer Time Service (ACTS), and time.gov Web Sites
Levine J., M.A. Lombardi, and A.N. Novick, Nist Computer Time Services: Internet Time Service (Its), Automated Computer Time Service (Acts), And Time.gov Web Sites (National Institute of Standards and Technology, Washington, Dc, 2002), p. 84.
2001
The leap second: its history and possible future
Nelson R.A., D.D. McCarthy, S. Malys, J. Levine, B. Guinot, H.F. Fliegel, R.L. Beard, and T.R. Bartholomew, Metrologia 38, 509-529 (2001).
First comparison of remote cesium fountains
Parker T.E., P. Hetzel, S.R. Jefferts, S. Weyers, L. Nelson, A. Bauch, and J. Levine, in (IEEE, Seattle, Wa, Usa, 2001).
GPS as a global time service: Proposed enhancements in time keeping and dissemination
Gifford A., J. Levine, S. Pace, J. McNeff, and T.R. Bartholomew, in (2001).
Technical Reference Manual for NIST Automated Computer Time Service (ACTS)
Levine J., M.A. Lombardi, L.M. Nelson, and V.S. Zhang, in (2001).
Time and frequency metrology
Sullivan D.B., and J. Levine, in (Narosa Publishing House, 2001).
Understanding limitations of GPS carrier phase frequency transfer on a transatlantic baseline
Nelson L.M., and J. Levine, in (IEEE, Seattle, Wa, Usa, 2001).
2000
Assessment of GPS carrier-phase stability for time-transfer applications
Larson K.M., J. Levine, L.M. Nelson, and T.E. Parker, Ieee Transactions On Ultrasonics, Ferroelectrics And Frequency Control 47, 484-494 (2000).
Examining GPS carrier-phase analyses to evaluate the accuracy of frequency transfer using data from NIST and PTB
Nelson L., and J. Levine, in (2000).
Using the Network Time Protocol (NTP) to transmit International Atomic Time (TAI)
Levine J., and D. Mills, in (2000).
Comparing primary frequency standards at NIST and PTB
Nelson L.M., J. Levine, and P. Hetzel, in (IEEE, Kansas City, Mo, Usa, 2000).
Analysis of delays in transmitting time code using an automated computer time distribution system
Shan Y., H.A. Chua, A.M. Kyaw, and J. Levine, in (2000).
1999
Carrier-phase time transfer
Larson K.M., and J. Levine, Ieee Transactions On Ultrasonics, Ferroelectrics And Frequency Control 46, 1001-1012 (1999).
Time synchronization over the Internet using an adaptive frequency-locked loop
Levine J., Ieee Transactions On Ultrasonics, Ferroelectrics And Frequency Control 46, 888-896 (1999).
Time transfer using multi-channel GPS receivers
Levine J., Ieee Transactions On Ultrasonics, Ferroelectrics And Frequency Control 46, 392-398 (1999).
Introduction to time and frequency metrology
Levine J., Review Of Scientific Instruments 70, 2567-2596 (1999).
Comparison of atomic frequency standards at NIST and PTB using carrier-phase GPS
Nelson L., J. Levine, T.E. Parker, K.M. Larson, P. Hetzel, and J. Becker, in (1999).
Review of GPS carrier-phase and two-way satellite time transfer measurement results between Schriever Air Force Base and the United States Naval Observatory
Nelson L.M., K.M. Larson, and J. Levine, Proceedings Of The 12Th International Technical Meeting Of The Satellite Division Of The Institute Of Navigation (Ion Gps 1999) 1023, 1023-1034 (1999).
Authenticating time and frequency signals
Levine J., in (IEEE, Besancon, France, 1999).
Calibration of carrier phase GPS receivers
Nelson L.M., K.M. Larson, and J. Levine, in (IEEE, Besancon, France, 1999).
1998
Time transfer using the phase of the GPS carrier
Larson K.M., and J. Levine, Ieee Transactions On Ultrasonics, Ferroelectrics And Frequency Control 45, 539-540 (1998).
Time synchronization using the Internet
Levine J., Ieee Transactions On Ultrasonics, Ferroelectrics And Frequency Control 45, 450-460 (1998).
A long-term comparison between GPS carrier-phase and two-way satellite time transfer
Larson K.M., L. Nelson, J. Levine, T.E. Parker, and E.D. Powers, in (1998).
Time synchronization over the Internet using "autolock"
Levine J., in (IEEE, Pasadena, Ca, Usa, 1998).
Time transfer using a multi-channel code-based GPS receiver
Levine J., in (IEEE, Pasadena, Ca, Usa, 1998).
1997
Impact of new high stability frequency standards on the performance of the NIST AT1 time scale
Parker T.E., and J. Levine, Ieee Transactions On Ultrasonics, Ferroelectrics And Frequency Control 44, 1239-1244 (1997).
Incorporating data from a primary frequency standard into a time scale
Levine J., Ieee Transactions On Ultrasonics, Ferroelectrics And Frequency Control 44, 629-636 (1997).
Two-way time and frequency transfer using optical fibers
Jefferts S.R., M.A. Weiss, J. Levine, S. Dilla, E.W. Bell, and T.E. Parker, Ieee Transactions On Instrumentation And Measurement 46, 209-211 (1997).
Precision synchronization of computer network clocks
Levine J., in (Marcel Dekker, Inc., Ny, Ny, 1997), p. 281\textendash306.
Time synchronization using the Internet
Monington K.W., and J. Levine, in (IEEE, Orlando, Fl, Usa, 1997).
Time transfer using GPS carrier phase methods
Larson K.M., and J. Levine, in (1997).
Why experimentalists mistrust computer modeling\textendashand why they rely on it
Levine J., Computers In Physics, Vol. Ii 11, (1997).
1996
Incorporating data from a primary frequency standard into a time scale
Levine J., in (IEEE, Honolulu, Hi, Usa, 1996).
Methods of distributing time and frequency: A review
Levine J., in (Oxford University Press, Incorporated, 1996).
Recent improvements in the performance of the NIST AT1 time scale
Parker T.E., and J. Levine, in (IEEE, Honolulu, Hi, Usa, 1996).
Two-way time and frequency transfer in SONET
Weiss M.A., S.R. Jefferts, J. Levine, S. Dilla, T.E. Parker, and E.W. Bell, in (IEEE, Honolulu, Hi, Usa, 1996).
Two-way time transfer through SDH and SONET systems
Jefferts S.R., M.A. Weiss, J. Levine, S. Dilla, and T.E. Parker, in (IEEE, Brighton, Uk, 1996).
1995
Measurement and interpretation of tidal tilts in a small array
Kohl M.L., and J. Levine, Journal Of Geophysical Research 100, 3929 (1995).
1994
An algorithm to synchronize the time of a computer to Universal Time
Levine J., Ieee/Acm Trans. On Networking 3, (1994).
Analytical estimation of carrier multipath bias on GPS position measurements
Volk C.M., and J. Levine, Analytical Estimation Of Carrier Multipath Bias On Gps Position Measurements (1994).
SPIE Proceedings Measurement of very low frequency vibrations
Levine J., in (SPIE, San Diego, Ca, 1994).
1993
The future of time and frequency dissemination
Levine J., in (NASA, Goddard Space Flight Center, 1993).
Measuring low frequency tilts
Kohl M.L., and J. Levine, Journal Of Research Of The National Institute Of Standards And Technology 98, (1993).
The NIST internet time service
Levine J., in (NASA, Goddard Space Flight Center, 1993).
1992
Smart clock: a new time
Weiss M.A., D.W. Allan, D.D. Davis, and J. Levine, Ieee Transactions On Instrumentation And Measurement 41, 915-918 (1992).
Measurement methods and algorithms for comparison of local and remote clocks
Levine J., in (1992).
Smart clock: a new time
Weiss M.A., D.W. Allan, D.D. Davis, and J. Levine, in (IEEE, Metropolitan, Ny, Usa, 1992).
1991
Time generation and distribution
Sullivan D.B., and J. Levine, Proceedings Of The Ieee 79, 906-914 (1991).
1990
New inexpensive frequency calibration service from NIST
Allan D.W., D.D. Davis, J. Levine, M.A. Weiss, N. Hironaka, and D. Okayama, in (IEEE, Baltimore, Md, Usa, 1990).
A rubidium frequency standard and a GPS receiver. A remotely steered clock system with good short-term and long-term stability
Allan D.W., and J. Levine, in (IEEE, Baltimore, Md, Usa, 1990).