Technical Directives for Standardization of GPS Time Receiver Software: to be implemented for improving the accuracy of GPS common-view time transfer

Allan, David W.; Thomas, C.

doi:10.1088/0026-1394/31/1/014

Cited by 103 publications

(34 citation statements)

References 1 publication

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“…The Cs4000 oscillator provides the reference frequency to the PolaRx2e receiver, which is able to time-tag its "One Pulse Per Second" output (1PPS) with respect to the individual GPS satellite observations. The latter are processed offline by using the CGGTTS format [20]. The two systems feature a technology routinely used for high-accuracy time-transfer applications by national time and frequency metrology laboratories around the world, in order to compare atomic clocks [21].…”

Section: Principle Of the Neutrino Time Of Flight Measurementmentioning

confidence: 99%

Measurement of the neutrino velocity with the OPERA detector in the CNGS beam

Adam

Agafonova

Aleksandrov

et al. 2012

J. High Energ. Phys.

212

217

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The OPERA neutrino experiment at the underground Gran Sasso Laboratory has measured the velocity of neutrinos from the CERN CNGS beam over a baseline of about 730 km. The measurement is based on data taken by OPERA in the years 2009, 2010 and 2011. Dedicated upgrades of the CNGS timing system and of the OPERA detector, as well as a high precision geodesy campaign for the measurement of the neutrino baseline, allowed reaching comparable systematic and statistical accuracies.An arrival time of CNGS muon neutrinos with respect to the one computed assuming the speed of light in vacuum of (6.5 ± 7.4 (stat.) +8.3 −8.0 (sys.)) ns was measured corresponding to a relative difference of the muon neutrino velocity with respect to the speed of light (v − c)/c = (2.7 ± 3.1 (stat.) +3.4 −3.3 (sys.)) × 10 −6 . The above result, obtained by comparing the time distributions of neutrino interactions and of protons hitting the CNGS target in 10.5 µs long extractions, was confirmed by a test performed at the end of 2011 using a short bunch beam allowing to measure the neutrino time of flight at the single interaction level.

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Section: Principle Of the Neutrino Time Of Flight Measurementmentioning

confidence: 99%

Measurement of the neutrino velocity with the OPERA detector in the CNGS beam

Adam

Agafonova

Aleksandrov

et al. 2012

J. High Energ. Phys.

212

217

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“…Then you can get the sum of squared residuals: (8) According to the principle of multivariate function extremum , ) , , ( Q …”

Section: Least Squares Fitting Algorithmmentioning

confidence: 99%

“…At present, the standard time used by all the countries or regions must be traced directly or indirectly to the unified time UTC which established by the International Bureau of Weights and Measures (BIPM). The main traceability way is GPS (Global Positioning System) common view method to comparing the time among laboratories which distance is very long [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Research in Application of Geodetic GPS Receivers in Time Synchronization

Zhang

Sun

et al. 2018

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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KEY WORDS: Time Synchronization, GPS Common-View, GPSABSTRACT：In recent years, with the development of satellite orbit and clock parameters accurately determining technology and the popularity of geodetic GPS receivers, Common-View (CV) which proposed in 1980 by Allan has gained widespread application and achieved higher accuracy time synchronization results. GPS Common View (GPS CV) is the technology that based on multi-channel geodetic GPS receivers located in different place and under the same common-view schedule to receiving same GPS satellite signal at the same time，and then calculating the time difference between respective local receiver time and GPST by weighted theory, we will obtain the difference between above local time of receivers that installed in different station with external atomic clock。 Multi-channel geodetic GPS receivers have significant advantages such as higher stability、higher accuracy and more common-view satellites in long baseline time synchronization application over the single-channel geodetic GPS receivers. At present, receiver hardware delay and surrounding environment influence are main error factors that affect the accuracy of GPS common-view result. But most error factors will be suppressed by observation data smoothing and using of observation data from different satellites in multi-channel geodetic GPS receiver. After the SA(Selective Availability)cancellation, Using a combination of precise satellite ephemeris ,ionospheric-free dual-frequency P-code observations and accurately measuring of receiver hardware delay, we can achieve time synchronization result on the order of nanoseconds (ns). In this paper, 6 days observation data of two IGS core stations with external atomic clock (PTB, USNO distance of two stations about 6000 km) were used to verify the GPS common-view theory. Through GPS observation data analysis, there are at least 2-4 common-view satellites and 5 satellites in a few tracking periods between two stations when the elevation angle is 15 °，even there will be at least 2 common-view satellites for each tracking period when the elevation angle is 30°. Data processing used precise GPS satellite ephemeris, double-frequency P-code combination observations without ionosphere effects and the correction of the Black troposphere Delay Model. the weighted average of all common-viewed GPS satellites in the same tracking period is taken by weighting the root-mean-square error of each satellite, finally a time comparison data between two stations is obtained, and then the time synchronization result between the two stations (PTB and USNO) is obtained. It can be seen from the analysis of time synchronization result that the root mean square error of REFSV (the difference between the local frequency standard at the mid-point of the actual tracking length and the tracked satellite time in unit of 0.1 ns) shows a linear change within one day, However the jump occurs when jumping over the day which is mainly caused by satellites position being changed due to the interpolation ...

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“…Another option is the use of the IGS time, a time scale calculated by the International GNSS Service (IGS) [10], which is used as the reference for various IGS products [11]. To facilitate the data exchange for time transfer and dissemination, directives on a common format and standard formulae and parameters have been provided jointly by the International Bureau of Weights and Measures (Bureau international des poids et mesures, BIPM) and the Consultative Committee for Time and Frequency (CCTF) [12].…”

Section: Code-based Time and Frequency Transfermentioning

confidence: 99%

Time and frequency comparisons using radiofrequency signals from satellites

Bauch

2015

Comptes Rendus. Physique

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Technical Directives for Standardization of GPS Time Receiver Software: to be implemented for improving the accuracy of GPS common-view time transfer

Cited by 103 publications

References 1 publication

Measurement of the neutrino velocity with the OPERA detector in the CNGS beam

Measurement of the neutrino velocity with the OPERA detector in the CNGS beam

Research in Application of Geodetic GPS Receivers in Time Synchronization

Time and frequency comparisons using radiofrequency signals from satellites

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