JILA Science Publications
Displaying 1 - 100 of 140
2020
The statistics of computer clocks and the design of synchronization algorithms
Judah Levine, Journal of Research of the National Institute of Standards and Technology 125, 008 (2020).
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Judah Levine, Journal of Research of the National Institute of Standards and Technology 125, 008 (2020).
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2019
Demonstration of a Timescale Based on a Stable Optical CarrierWilliam Milner, John Robinson, Colin Kennedy, Tobias Bothwell, Dhruv Kedar, Dan Matei, Thomas Legero, Uwe Sterr, Fritz Riehle, Holly Leopardi, Tara Fortier, Jeffrey Sherman, Judah Levine, Jian Yao, Jun Ye, Eric Oelker, Physical Review Letters 123, 173201 (2019).
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2018
Incorporating an Optical Clock Into a Time Scale
Jian Yao, Thomas Parker, Neil Ashby, Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 65, 127-134 (2018).
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Jian Yao, Thomas Parker, Neil Ashby, Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 65, 127-134 (2018).
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2017
JY1 time scale: a new Kalman-filter time scale designed at NIST
Jian Yao, Thomas Parker, Judah Levine, Measurement Science and Technology 28, 115004 (2017).
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Jian Yao, Thomas Parker, Judah Levine, Measurement Science and Technology 28, 115004 (2017).
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2016
Coordinated Universal Time and the Leap Second
Judah Levine, URSI Radio Sci. Bull. 359, 30-36 (2016).
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Judah Levine, URSI Radio Sci. Bull. 359, 30-36 (2016).
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A Historical Perspective on the Development of the Allan Variances and Their Strengths and Weaknesses
David Allan, Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 63, 513-519 (2016).
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David Allan, Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 63, 513-519 (2016).
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An Algorithm for Synchronizing a Clock When the Data Are Received Over a Network With an Unstable Delay
Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 63, 561-570 (2016).
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Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 63, 561-570 (2016).
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Introduction to the Special Issue on Celebrating the 50th Anniversary of the Allan Variance
Judah Levine, Patrizia Tavella, Giorgio Santarelli, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 63, 511-512 (2016).
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Judah Levine, Patrizia Tavella, Giorgio Santarelli, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 63, 511-512 (2016).
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Measuring Time and Comparing Clocks
Judah Levine, , 2109-2162 (2016).
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Judah Levine, , 2109-2162 (2016).
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The history of time and frequency from antiquity to the present day
Judah Levine, The European Physical Journal H , (2016).
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Judah Levine, The European Physical Journal H , (2016).
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A Study of GPS Carrier-Phase Time Transfer Noise Based on NIST GPS Receivers
J. Yao, Judah Levine, Journal of Research of the National Institute of Standards and Technology 121, 372 (2016).
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J. Yao, Judah Levine, Journal of Research of the National Institute of Standards and Technology 121, 372 (2016).
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An Auto-Regressive Moving-Average Time Scale Algorithm (ARMA) for Synchronizing Networked Clocks
Judah Levine, , (2016).
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Judah Levine, , (2016).
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GPS Jamming and GPS Carrier-Phase Time Transfer
Jian Yao, Marc Weiss, Charles Curry, Judah Levine, , (2016).
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Jian Yao, Marc Weiss, Charles Curry, Judah Levine, , (2016).
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Usage Analysis of the NIST Internet Time Service
Jeff Sherman, Judah Levine, Journal of Research of the National Institute of Standards and Technology 121, 33 (2016).
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Jeff Sherman, Judah Levine, Journal of Research of the National Institute of Standards and Technology 121, 33 (2016).
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Long-term GPS carrier-phase time transfer noise: A study based on seven GPS receivers at NIST
J. Yao, Judah Levine, , (2016).
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J. Yao, Judah Levine, , (2016).
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2015
A detailed comparison of two continuous GPS carrier-phase time transfer techniques
J. Yao, Ivan Skakun, Zhiheng Jiang, Judah Levine, Metrologia 52, 666-676 (2015).
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J. Yao, Ivan Skakun, Zhiheng Jiang, Judah Levine, Metrologia 52, 666-676 (2015).
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Toward Continuous GPS Carrier-Phase Time Transfer: Eliminating the Time Discontinuity at an Anomaly
J. Yao, Judah Levine, M. Weiss, Journal of Research of the National Institute of Standards and Technology 120, 280 (2015).
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J. Yao, Judah Levine, M. Weiss, Journal of Research of the National Institute of Standards and Technology 120, 280 (2015).
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Comparison of two continuous GPS carrier-phase time transfer techniques
J. Yao, Ivan Skakun, Zhiheng Jiang, Judah Levine, , (2015).
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J. Yao, Ivan Skakun, Zhiheng Jiang, Judah Levine, , (2015).
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2014
An Improvement of RINEX-Shift Algorithm for Continuous GPS Carrier-Phase Time Transfer
Jian Yao, Judah Levine, , (2014).
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Jian Yao, Judah Levine, , (2014).
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International Comparisons of Network Time Protocol Servers
M. Lombardi, Judah Levine, Mauricio Lopez, F. Jiménez, J. Bernard, M. Gertsvolf, H. Sanchez, O. Fallas, L. Forero, Ricardo de Carvalho, M. Fittipaldi, R. Solis, F. Espejo, , (2014).
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M. Lombardi, Judah Levine, Mauricio Lopez, F. Jiménez, J. Bernard, M. Gertsvolf, H. Sanchez, O. Fallas, L. Forero, Ricardo de Carvalho, M. Fittipaldi, R. Solis, F. Espejo, , (2014).
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2013
A New Algorithm to Eliminate GPS Carrier-Phase Time Transfer Boundary Discontinuity
Jian Yao, Judah Levine, , (2013).
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Jian Yao, Judah Levine, , (2013).
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Time transfer using a satellite navigation system
Judah Levine, , 363-368 (2013).
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Judah Levine, , 363-368 (2013).
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2012
Invited Review Article: The statistical modeling of atomic clocks and the design of time scales
Judah Levine, Review of Scientific Instruments 83, 021101-021128 (2012).
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Judah Levine, Review of Scientific Instruments 83, 021101-021128 (2012).
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GPS Carrier-Phase Time Transfer Boundary Discontinuity Investigation
Jian Yao, Judah Levine, , (2012).
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Jian Yao, Judah Levine, , (2012).
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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)]
Judah Levine, Review of Scientific Instruments 83, 129902 (2012).
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Judah Levine, Review of Scientific Instruments 83, 129902 (2012).
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2011
Synchronizing Computer Clocks by the User of Kalman Filters
Judah Levine, , (2011).
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Judah Levine, , (2011).
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Synchronizing Computer Clocks Using Kalman Filters
Judah Levine, , (2011).
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Judah Levine, , (2011).
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Timing in telecommunications networks
Judah Levine, Metrologia 48, S203 - S212 (2011).
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Judah Levine, Metrologia 48, S203 - S212 (2011).
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2008
A review of time and frequency transfer methods
Judah Levine, Metrologia 45, S162 - S174 (2008).
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Judah Levine, Metrologia 45, S162 - S174 (2008).
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Improvements to the NIST network time protocol servers
Judah Levine, Metrologia 45, S12 - S22 (2008).
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Judah Levine, Metrologia 45, S12 - S22 (2008).
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Realizing UTC(NIST) at a remote location
Judah Levine, Metrologia 45, S23 - S33 (2008).
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Judah Levine, Metrologia 45, S23 - S33 (2008).
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Steering at Time Scale
Judah Levine, , (2008).
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Judah Levine, , (2008).
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2006
A straightforward frequency-estimation technique for GPS carrier-phase time transfer
Christine Hackman, Judah Levine, T. Parker, D. Piester, J. Becker, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 53, 1570-1583 (2006).
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Christine Hackman, Judah Levine, T. Parker, D. Piester, J. Becker, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 53, 1570-1583 (2006).
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A Long-term Comparison of GPS Carrier-Phase Frequency Transfer and Two-way Satellite Time/Frequency Transfer
Christine Hackman, Judah Levine, Thomas Parker, , (2006).
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Christine Hackman, Judah Levine, Thomas Parker, , (2006).
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Towards Sub-10-16 Transcontinental GPS Carrier-Phase Frequency Transfer: a Simulation Study
Christine Hackman, Judah Levine, , (2006).
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Christine Hackman, Judah Levine, , (2006).
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2004
Adding water vapor radiometer data to GPS carrier-phase time transfer
Christine Hackman, Judah Levine, , (2004).
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Christine Hackman, Judah Levine, , (2004).
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Averaging Satellite Timing Data for National and International Time Coordination
Judah Levine, , (2004).
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Judah Levine, , (2004).
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Coping with Overload on the Network Time Protocol Public Servers
David Mills, Judah Levine, Richard Schmidt, David Plonka, , (2004).
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David Mills, Judah Levine, Richard Schmidt, David Plonka, , (2004).
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A new technique for estimating frequency from GPS carrier-phase time transfer data
Christine Hackman, Judah Levine, T. Parker, D. Piester, J. Becker, , (2004).
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Christine Hackman, Judah Levine, T. Parker, D. Piester, J. Becker, , (2004).
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2003
New frequency comparisons using GPS carrier-phase time transfer
Christine Hackman, Judah Levine, , (2003).
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Christine Hackman, Judah Levine, , (2003).
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2002
Time and frequency distribution using satellites
Judah Levine, Reports on Progress in Physics 65, 1119-1164 (2002).
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Judah Levine, Reports on Progress in Physics 65, 1119-1164 (2002).
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Efficient time transfer using the Internet
Judah Levine, , (2002).
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Judah Levine, , (2002).
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NIST Computer Time Services: Internet Time Service (ITS), Automated Computer Time Service (ACTS), and time.gov Web Sites
Judah Levine, M. Lombardi, A. Novick, , 84 (2002).
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Judah Levine, M. Lombardi, A. Novick, , 84 (2002).
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The algorithm used to realize UTC(NIST)
Judah Levine, T. Parker, , (2002).
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Judah Levine, T. Parker, , (2002).
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NIST Spec. Publ. 250-59
Judah Levine, M. Lombardi, A. Novick, , (2002).
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Judah Levine, M. Lombardi, A. Novick, , (2002).
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2001
The leap second: its history and possible future
R. Nelson, D. McCarthy, S. Malys, Judah Levine, B Guinot, H Fliegel, R. Beard, T. Bartholomew, Metrologia 38, 509-529 (2001).
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R. Nelson, D. McCarthy, S. Malys, Judah Levine, B Guinot, H Fliegel, R. Beard, T. Bartholomew, Metrologia 38, 509-529 (2001).
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GPS and the Legal Traceability of Time
Judah Levine, GPS World , 52-58 (2001).
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Judah Levine, GPS World , 52-58 (2001).
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First comparison of remote cesium fountains
T. Parker, P. Hetzel, S. Jefferts, S. Weyers, L. Nelson, A. Bauch, Judah Levine, , (2001).
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T. Parker, P. Hetzel, S. Jefferts, S. Weyers, L. Nelson, A. Bauch, Judah Levine, , (2001).
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GPS as a global time service: Proposed enhancements in time keeping and dissemination
A. Gifford, Judah Levine, S. Pace, J. McNeff, T. Bartholomew, , (2001).
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A. Gifford, Judah Levine, S. Pace, J. McNeff, T. Bartholomew, , (2001).
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Technical Reference Manual for NIST Automated Computer Time Service (ACTS)
Judah Levine, M. Lombardi, L. Nelson, V. Zhang, , (2001).
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Judah Levine, M. Lombardi, L. Nelson, V. Zhang, , (2001).
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Time and frequency metrology
D. Sullivan, Judah Levine, , (2001).
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D. Sullivan, Judah Levine, , (2001).
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Understanding limitations of GPS carrier phase frequency transfer on a transatlantic baseline
L. Nelson, Judah Levine, , (2001).
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L. Nelson, Judah Levine, , (2001).
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2000
Assessment of GPS carrier-phase stability for time-transfer applications
K. Larson, Judah Levine, L. Nelson, T. Parker, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 47, 484-494 (2000).
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K. Larson, Judah Levine, L. Nelson, T. Parker, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 47, 484-494 (2000).
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Examining GPS carrier-phase analyses to evaluate the accuracy of frequency transfer using data from NIST and PTB
L. Nelson, Judah Levine, , (2000).
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L. Nelson, Judah Levine, , (2000).
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Using the Network Time Protocol (NTP) to transmit International Atomic Time (TAI)
Judah Levine, D. Mills, , (2000).
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Judah Levine, D. Mills, , (2000).
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Comparing primary frequency standards at NIST and PTB
L. Nelson, Judah Levine, P. Hetzel, , (2000).
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L. Nelson, Judah Levine, P. Hetzel, , (2000).
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Analysis of delays in transmitting time code using an automated computer time distribution system
Y. Shan, H. Chua, A. Kyaw, Judah Levine, , (2000).
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Y. Shan, H. Chua, A. Kyaw, Judah Levine, , (2000).
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Legal traceability of time
Judah Levine, , (2000).
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Judah Levine, , (2000).
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1999
Carrier-phase time transfer
K. Larson, Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 46, 1001-1012 (1999).
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K. Larson, Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 46, 1001-1012 (1999).
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Time synchronization over the Internet using an adaptive frequency-locked loop
Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 46, 888-896 (1999).
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Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 46, 888-896 (1999).
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Time transfer using multi-channel GPS receivers
Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 46, 392-398 (1999).
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Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 46, 392-398 (1999).
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Introduction to time and frequency metrology
Judah Levine, Review of Scientific Instruments 70, 2567-2596 (1999).
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Judah Levine, Review of Scientific Instruments 70, 2567-2596 (1999).
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Comparison of atomic frequency standards at NIST and PTB using carrier-phase GPS
L. Nelson, Judah Levine, T. Parker, K. Larson, P. Hetzel, J. Becker, , (1999).
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L. Nelson, Judah Levine, T. Parker, K. Larson, P. Hetzel, J. Becker, , (1999).
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Review of GPS carrier-phase and two-way satellite time transfer measurement results between Schriever Air Force Base and the United States Naval Observatory
L. Nelson, K. Larson, Judah Levine, Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) 1023, 1023-1034 (1999).
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L. Nelson, K. Larson, Judah Levine, Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) 1023, 1023-1034 (1999).
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Authenticating time and frequency signals
Judah Levine, , (1999).
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Judah Levine, , (1999).
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Calibration of carrier phase GPS receivers
L. Nelson, K. Larson, Judah Levine, , (1999).
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L. Nelson, K. Larson, Judah Levine, , (1999).
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1998
Time transfer using the phase of the GPS carrier
K. Larson, Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 45, 539-540 (1998).
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K. Larson, Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 45, 539-540 (1998).
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Time synchronization using the Internet
Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 45, 450-460 (1998).
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Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 45, 450-460 (1998).
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A long-term comparison between GPS carrier-phase and two-way satellite time transfer
K. Larson, L. Nelson, Judah Levine, T. Parker, E. Powers, , (1998).
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K. Larson, L. Nelson, Judah Levine, T. Parker, E. Powers, , (1998).
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Time synchronization over the Internet using "autolock"
Judah Levine, , (1998).
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Judah Levine, , (1998).
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Time transfer using a multi-channel code-based GPS receiver
Judah Levine, , (1998).
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Judah Levine, , (1998).
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1997
Impact of new high stability frequency standards on the performance of the NIST AT1 time scale
T. Parker, Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 44, 1239-1244 (1997).
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T. Parker, Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 44, 1239-1244 (1997).
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Incorporating data from a primary frequency standard into a time scale
Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 44, 629-636 (1997).
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Judah Levine, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 44, 629-636 (1997).
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Two-way time and frequency transfer using optical fibers
S. Jefferts, M. Weiss, Judah Levine, S. Dilla, E. Bell, T. Parker, IEEE Transactions on Instrumentation and Measurement 46, 209-211 (1997).
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S. Jefferts, M. Weiss, Judah Levine, S. Dilla, E. Bell, T. Parker, IEEE Transactions on Instrumentation and Measurement 46, 209-211 (1997).
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Panel discussion on time rollover events and leap seconds
Judah Levine, , (1997).
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Judah Levine, , (1997).
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Precision synchronization of computer network clocks
Judah Levine, , 281\textendash306 (1997).
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Judah Levine, , 281\textendash306 (1997).
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Time synchronization using the Internet
K. Monington, Judah Levine, , (1997).
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K. Monington, Judah Levine, , (1997).
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Time transfer using GPS carrier phase methods
K. Larson, Judah Levine, , (1997).
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K. Larson, Judah Levine, , (1997).
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Why experimentalists mistrust computer modeling\textendashand why they rely on it
Judah Levine, Computers in Physics, Vol. II 11, (1997).
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Judah Levine, Computers in Physics, Vol. II 11, (1997).
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1996
Incorporating data from a primary frequency standard into a time scale
Judah Levine, , (1996).
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Judah Levine, , (1996).
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Methods of distributing time and frequency: A review
Judah Levine, , (1996).
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Judah Levine, , (1996).
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Recent improvements in the performance of the NIST AT1 time scale
T. Parker, Judah Levine, , (1996).
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T. Parker, Judah Levine, , (1996).
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Time and frequency activities at NIST
Judah Levine, , (1996).
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Judah Levine, , (1996).
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Two-way time and frequency transfer in SONET
M. Weiss, S. Jefferts, Judah Levine, S. Dilla, T. Parker, E. Bell, , (1996).
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M. Weiss, S. Jefferts, Judah Levine, S. Dilla, T. Parker, E. Bell, , (1996).
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Two-way time transfer through SDH and SONET systems
S. Jefferts, M. Weiss, Judah Levine, S. Dilla, T. Parker, , (1996).
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S. Jefferts, M. Weiss, Judah Levine, S. Dilla, T. Parker, , (1996).
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1995
Measurement and interpretation of tidal tilts in a small array
M. Kohl, Judah Levine, Journal of Geophysical Research 100, 3929 (1995).
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M. Kohl, Judah Levine, Journal of Geophysical Research 100, 3929 (1995).
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Authentication, time-stamping, and digital signatures
Judah Levine, , (1995).
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Judah Levine, , (1995).
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UTC dissemination to the real-time user
Judah Levine, , (1995).
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Judah Levine, , (1995).
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1994
An algorithm to synchronize the time of a computer to Universal Time
Judah Levine, IEEE/ACM Trans. on Networking 3, (1994).
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Judah Levine, IEEE/ACM Trans. on Networking 3, (1994).
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Analytical estimation of carrier multipath bias on GPS position measurements
C. Volk, Judah Levine, , (1994).
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C. Volk, Judah Levine, , (1994).
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SPIE Proceedings Measurement of very low frequency vibrations
Judah Levine, , (1994).
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Judah Levine, , (1994).
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1993
Measuring low frequency tilts
M. Kohl, Judah Levine, Journal of Research of the National Institute of Standards and Technology 98, (1993).
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M. Kohl, Judah Levine, Journal of Research of the National Institute of Standards and Technology 98, (1993).
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The future of time and frequency dissemination
Judah Levine, , (1993).
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Judah Levine, , (1993).
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The NIST internet time service
Judah Levine, , (1993).
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Judah Levine, , (1993).
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1992
Smart clock: a new time
M. Weiss, D. Allan, D. Davis, Judah Levine, IEEE Transactions on Instrumentation and Measurement 41, 915-918 (1992).
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M. Weiss, D. Allan, D. Davis, Judah Levine, IEEE Transactions on Instrumentation and Measurement 41, 915-918 (1992).
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Measurement methods and algorithms for comparison of local and remote clocks
Judah Levine, , (1992).
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Judah Levine, , (1992).
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Smart clock: a new time
M. Weiss, D. Allan, D. Davis, Judah Levine, , (1992).
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M. Weiss, D. Allan, D. Davis, Judah Levine, , (1992).
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1991
Time generation and distribution
D. Sullivan, Judah Levine, Proceedings of the IEEE 79, 906-914 (1991).
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D. Sullivan, Judah Levine, Proceedings of the IEEE 79, 906-914 (1991).
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1990
A rubidium frequency standard and a GPS receiver. A remotely steered clock system with good short-term and long-term stability
D. Allan, Judah Levine, , (1990).
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D. Allan, Judah Levine, , (1990).
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New inexpensive frequency calibration service from NIST
D. Allan, D. Davis, Judah Levine, M. Weiss, N. Hironaka, D. Okayama, , (1990).
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D. Allan, D. Davis, Judah Levine, M. Weiss, N. Hironaka, D. Okayama, , (1990).
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