High-precision two-way optic-fiber time transfer using an improved time code

2014 ◽  
Vol 85 (11) ◽  
pp. 114701 ◽  
Author(s):  
Guiling Wu ◽  
Liang Hu ◽  
Hao Zhang ◽  
Jianping Chen
Keyword(s):  
High Precision ◽  
Optic Fiber ◽  
Time Transfer ◽  
Time Code

scholarly journals Joint Frequency and Time Transfer Over Optical Fiber With High-Precision Delay Variation Measurement Using a Phase-Locked Loop

2019 ◽  
Vol 11 (2) ◽  
pp. 1-8 ◽  
Author(s):  
Xiaocheng Wang ◽  
Wei Wei ◽  
Zhangweiyi Liu ◽  
Daming Han ◽  
Nan Deng ◽  
...  
Keyword(s):  
Optical Fiber ◽  
High Precision ◽  
Phase Locked Loop ◽  
Time Transfer ◽  
Joint Frequency ◽  
Delay Variation

Distributed high-precision time transfer through passive optical networks

2014 ◽  
Vol 53 (9) ◽  
pp. 096113
Author(s):  
Guiling Wu ◽  
Liang Hu ◽  
Hao Zhang ◽  
Jianping Chen
Keyword(s):  
Optical Networks ◽  
High Precision ◽  
Passive Optical Networks ◽  
Time Transfer ◽  
Precision Time

scholarly journals Comparison of VLBI and GNSS common view for time transfer

2019 ◽  
Vol 10 ◽  
pp. 15 ◽  
Author(s):  
Pingli Wang ◽  
Guangli Wang ◽  
Yuping Gao ◽  
Hongbing Cai ◽  
Na Liu
Keyword(s):  
High Precision ◽  
Rapid Development ◽  
Next Generation ◽  
Time Transfer ◽  
Position Measurement ◽  
Common View ◽  
Practical Applications ◽  
Time Frequency ◽  
Frequency Standards ◽  
Frequency Transfer

With the rapid development of optical clock, the stability and system uncertainty of optical clocks has reached a 1.0e–18 level. Optical clocks will likely constitute the next generation of time-frequency standards for redefining the SI second. Because time and frequency transfer services that rely on satellite systems are not always reliable and currently available technologies are insufficient for comparing the next generation of frequency standards, high-precision time and transfer techniques are strongly desired. Very Long Baseline Interferometry (VLBI) is one of the space geodetic techniques that measure the arrival time delays between multiple stations utilizing radio signals from distant celestial radio sources. Not only can VLBI obtain the angle position measurement of the radio source with sub-millisecond accuracy and the station coordinate measurement with millimeter accuracy, but also, it can provide high-precision information regarding inter-station atomic clock differences. Therefore, it is theoretically feasible to use the VLBI technology to do the remote time transfer. Because of this characteristic of VLBI technology, VLBI has significant application potential in the field of remote time transfer. To confirm the suitability of VLBI to time-frequency transfer for future practical applications, the results of VLBI and GPS common view time transfer were compared using a Kunming-Urumqi baseline. The performance characteristics of time transfer based on VLBI are then analyzed. Experimental results show that VLBI technology can accurately measure the variation of clock differences between stations as same as the GPS common view time comparison technology. It briefly describes the challenges of future VLBI technology for practical applications of time transfer.

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