Detection of atomic clock frequency jumps with the Kalman filter

The problem of physical implementation of atomic timescales maximally adjusted to the national timescale UTC(SU) for working and secondary standards is considered. Results of analysis of stationary process of hydrogen maser timescale automatic steering to UTC(SU) using common view technique based on the signals of global navigational systems are presented. Calculation of Kalman filter and linear quadratic regulator parameters is described. Theoretical and experimental estimations of automatic steering quality characteristics are compared and discussed. The results obtained can be used to improve the accuracy of timescales on working and secondary standards.

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Mamdani’s Method in Atomic Clock of Communication Satellite using Uncertainity Method

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.l1132.10812s19 ◽

2019 ◽

Vol 8 (12S) ◽

pp. 532-535

Keyword(s):

Fuzzy Logic ◽

Atomic Clock ◽

Real Life ◽

Clock Frequency ◽

Fuzzy Logics ◽

Communication Satellite

This paper to apply the concept of fuzzy logic to calculate the change in distance on space while satellite is rotating around the earth.Fuzzy logic is a form of rationale where any number is the result of variable’s estimation in the range 0 and 1.Frequency and atomic clock value are considered to be studied .To determine change in distance and change in time of atomic clock of atomic clock.The method is explained theoretically using some data.It is easy to understand as a concept wise.Fuzzy stands for the meaning which is not clear or vague. In practical real life we cannot determine the situation as true or false there fuzzy provides a value.By utilizing and interpreting the data it represents the required information. Using fuzzy logics with the help of mamdani's method to determine the atomic clock frequency and values error can be calculated

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Study on the Dynamic Prediction of Atomic Clock Frequency based on UTCr

Proceedings of the 2015 International Conference on Industrial Technology and Management Science ◽

10.2991/itms-15.2015.189 ◽

2015 ◽

Author(s):

M. Yan ◽

L.L. Qu ◽

S.W. Dong ◽

S.H. Zhao

Keyword(s):

Atomic Clock ◽

Clock Frequency ◽

Dynamic Prediction

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Improved Time-Synchronization Algorithm Based on Direct Compensation of Disturbance Effects

Sensors ◽

10.3390/s19163499 ◽

2019 ◽

Vol 19 (16) ◽

pp. 3499 ◽

Cited By ~ 3

Author(s):

Yeoung-Duk Seo ◽

Kyou Jung Son ◽

Gi-Sung An ◽

Kyung Deok Nam ◽

Tae Gyu Chang ◽

...

Keyword(s):

Kalman Filter ◽

Dynamic Model ◽

Time Synchronization ◽

Monitoring And Control ◽

Clock Frequency ◽

Ieee 1588 ◽

Clock System ◽

Disturbance Effects ◽

Synchronization Algorithm ◽

Direct Compensation

In this paper, an improved time-synchronization algorithm is proposed. The improvement of time synchronizing performance was achieved by introducing a stochastic model-based direct compensation of the disturbance effects appearing in the IEEE 1588 Precision Time Protocol (PTP)-based time synchronization system. A dynamic model of PTP clock system was obtained by reflecting the three major sources of disturbances, i.e., clock frequency drift, clock rate offset, and network noise. With the application of the dynamic model of the PTP clock system, the effects of the disturbances can be effectively eliminated in the PTP time synchronization control loop. Computer simulations are performed to verify the performance of the proposed time synchronization algorithm by applying the various types of disturbances, including network noise and clock drift. The simulation results are compared with those of other representative time synchronization algorithms, i.e., IEEE 1588 PTP algorithm and Kalman-filter-based algorithm. It is shown that the proposed algorithm improves time synchronizing performance up to 84% with respect to that of the Kalman-filter-based synchronization algorithm when simulated with colored noise type disturbances. The proposed time synchronization algorithm is expected to contribute for the realization of future Ethernet-based industry-plant monitoring and control including IEC 61850-based digital substation.

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