Nonlinear effects in the time measurement device based on surface acoustic wave filter excitation

Procházka, Ivan; Panek, Petr

doi:10.1063/1.3155510

Cited by 12 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the basis of its detection, the control logic of the terminal opens a gate, which selects the next rising edge out of the received signal forming a pulse, which is time tagged by the event timer with respect to its local time scale based on the external frequency reference of 100 MHz. Thanks to the use of a new event timing technique [21][22][23][24][25][26], the times of arrival can be measured with subpicosecond precision, thus the influence of the event timer on the resulting TWOTT precision is negligible.…”

Section: Methodsmentioning

confidence: 99%

Two-way time transfer via optical fiber providing subpicosecond precision and high temperature stability

2015

View full text Add to dashboard Cite

We are reporting on analysis, design, construction, and key parameters of the device for a two-way time transfer via an optical fiber. The dominant source of errors in the two-way optical time transfer (TWOTT) via relatively short optical fibers is the temperature dependence of internal delays within the terminal units. We have performed an analysis of the influence of the internal delays and their temperature dependence on the TWOTT process considering two different configurations of the terminals with the feedback coupling in optical and electrical domains. The achieved results have been used for the optimal design of a TWOTT system implementing standard small form-factor pluggable optical transceivers. The operational tests of this new TWOTT system confirmed the precision of the time transfer on the subpicosecond level, the time transfer stability characterized by TDEV better than 60 fs for averaging intervals from 100 s to 10 000 s, and the temperature stability better than 100 fs K −1 .

show abstract

Section: Methodsmentioning

confidence: 99%

Two-way time transfer via optical fiber providing subpicosecond precision and high temperature stability

2015

View full text Add to dashboard Cite

show abstract

“…In the TWTT experiments we used the event timers based on our previous work [2][3][4][5][6]. Due to a new concept of the filter excitation a further improvement of the device performance was achieved.…”

Section: Methodsmentioning

confidence: 99%

“…The temperature dependence of a high performance coaxial cable of length 100 m can be expected in the range of ±5 ps K −1 [1] and other cables commonly have a much higher temperature dependence, up to ±500 ps K −1 . The event timers developed and used in our laboratory [2][3][4][5][6] provide sub-picosecond precision and a temperature dependence lower than 0.2 ps K −1 . However, the use of long interconnection cables can completely degrade the performance of the whole timing system.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of two-way time transfer via a single coaxial cable

2013

View full text Add to dashboard Cite

In order to find limits of the accuracy of the two-way time transfer (TWTT) via a single coaxial cable, we have carried out a detailed analysis which is presented in this paper. We applied the TWTT concept when a transmission line is driven by pulse current drivers and the times of arrival of the pulses are measured at the ends of the line. In addition to the estimation of the accuracy, the analysis provides several rules for proper design of a TWTT system with optimal performance. Based on this concept, a TWTT system for highly accurate time distribution or comparison has been designed and realized. For distances up to 1 km the accuracy was better than 100 ps without any additional correction or adjustment. After the influence of the non-symmetry of input–output circuits was corrected, the errors were lower than 20 ps for distances up to 2 km. The TWTT system is designated for keeping unified time in a net of event timers distributed in one building or in a relatively small area. The timing units forming the system guarantee the time transfer parallel to the time tagging of external pulses.

show abstract

“…The uncertainty of multipath is about 0.067 ns, and the results are shown in figure 13. The length of the cable used in calibration is about 30 m. According to the relevant paper, the uncertainty corresponding to 70 m is 0.09 ns and the uncertainty to 30 m u b,8 is about 0.039 ns [36]. The subsequent uncertainty we need to consider is related to the antenna u b,9 .…”

Section: Uncertainty Analysismentioning

confidence: 99%

Evaluation of receiver calibration based on clock-steering for time–frequency transfer

Guo,

Chen,

Gong

et al. 2023

Meas. Sci. Technol.

View full text Add to dashboard Cite

Calibrating the Global Navigation Satellite System (GNSS) time-frequency transfer system is crucial for accurate GNSS time-frequency transfer. The most commonly used relative calibration method relies on the common-clock to eliminate clock differences. However, it cannot eliminate the changes in clock signal reference point delay (REFDLY). The changes in REFDLY during calibration could not be ignored, especially for ordinary users in an unstable environment. To address this issue, we use the GNSS real-time single-difference (GNSS-RTSD) time synchronization calibration based on clock-steering, which can detect the change in REFDLY. According to this method, the clock differences and REFDLY are eliminated simultaneously. We installed two GNSS antennas on the roof of the Xinghu Building of Wuhan University and designed a clock synchronization terminal to evaluate the performance of this method. The data were collected on Day Of Year (DOY) 152~156, 167~171, 222~226, 231~235, 244, 258, 260, and 262 in 2022. In accordance with the calibration results, the standard deviation better than 100ps, and the stability reaches 10^{-15}@10000s. Also, the time variance better than 60ps, and the uncertainty u_{CAL} better than 0.5 ns. Compared to the common-clock calibration, one of the most significant benefits is the elimination of REFDLY, which leads to decreased uncertainty and better stability over both the short-term and long-term.

show abstract

Nonlinear effects in the time measurement device based on surface acoustic wave filter excitation

Cited by 12 publications

References 5 publications

Two-way time transfer via optical fiber providing subpicosecond precision and high temperature stability

Two-way time transfer via optical fiber providing subpicosecond precision and high temperature stability

Accuracy of two-way time transfer via a single coaxial cable

Evaluation of receiver calibration based on clock-steering for time–frequency transfer

Contact Info

Product

Resources

About