Research of a High Precision Time Synchronization Method Based on GPS Calibration

2014 ◽  
Vol 644-650 ◽  
pp. 1477-1480
Author(s):  
Bu Xin You ◽  
Jing Bu ◽  
Ming Hui Yin ◽  
Yun Zou
Keyword(s):  
Power System ◽  
High Precision ◽  
Time Synchronization ◽  
Least Squares Method ◽  
Generalized Least Squares ◽  
Measuring Instruments ◽  
Random Errors ◽  
Crystal Oscillator ◽  
Precision Measuring ◽  
Fitting Method

With the higher requirement for clock accuracy in power system, the accuracy and stability of wild area punctuality in GPS cannot meet the demands of the high–precision measuring instruments in power system. Firstly, this paper establishes the mathematical model of crystal oscillator clock error using polynomial fitting method. Then, it estimates the parameters of polynomial model with generalized least squares method. Thirdly, it updates the error-model of crystal oscillator clock dynamically for modifying its predicted error. The result shows, this method can not only predict accurate time error, but also filter out random errors well in GPS.

Self-Calibration of XY-Stage with Parallel Mechanism

2014 ◽  
Vol 590 ◽  
pp. 126-129
Author(s):  
Ryoshu Furutani ◽  
Satoshi Yokouchi ◽  
Miyu Ozaki
Keyword(s):  
High Precision ◽  
Parallel Mechanism ◽  
Least Squares Method ◽  
Calibration Method ◽  
Measuring Instruments ◽  
Precision Manufacturing ◽  
Kinematic Parameters ◽  
Self Calibration ◽  
Simulation And Experiment ◽  
Experimental Process

It is important to calibrate the straightness and the squareness of the XY-stage for precision manufacturing and measurement. Normally it is calibrated using much higher precise and accurate measuring instruments and/or artifacts. The high precision and accurate instruments and artifacts are expensive. So, in this paper, Self-calibration method is applied to XY-stage. This method does not require any much high precision and accurate instruments and artifacts. The normal XY-stage moves to the location at the unique coordinates. In this case, it is difficult to apply self-calibration method. Therefore, XY-stage is expanded to XYθ-stage with parallel mechanism. As this stage moves to the location at a lot of coordinates, self-calibration method is applied. This method is confirmed in simulation and experiment. In simulation, the extension lengths of mechanism are estimated from known kinematic parameters and the target coordinates. After that, estimated kinematic parameters are calculated by least-squares method from the extension lengths and the target coordinates. Finally, the positioning coordinates are calculated from the estimated kinematic parameters and the extension lengths. It is proved that the calibration method is effective by comparing the target coordinates and the positioning coordinates. In experiment, the experimental process is similar to the simulation without the estimation of extension lengths. The results of simulation and experiment are shown in this paper.

High Precision GPS Clock Synchronization Method Based on Time Different Compensation

2015 ◽  
Vol 713-715 ◽  
pp. 1373-1376
Author(s):  
Xue Ming Zhai ◽  
Lei Yang ◽  
Liang Yang
Keyword(s):  
Power System ◽  
High Precision ◽  
Software Design ◽  
Simultaneous Measurement ◽  
Time Synchronization ◽  
Clock Synchronization ◽  
Synchronization Method ◽  
Gps Satellites ◽  
Simulation Results ◽  
Better Than

In order to solve the issues of time synchronization that occurs in simultaneous measurement in power system, designing a GPS clock synchronization method based on time different compensation which can guarantee high-precision whether the GPS satellites are locked or not. The paper provides the basic idea describe and the overall hardware and software design. Simulation results show that the scheme provides second pulse with error in 0.8μs when GPS is locked and provides second pulse with error in 7μs when GPS is unlocked for 12 hours. The accuracy is better than the existing references.

High-precision measuring instruments

1961 ◽  
Vol 4 (4) ◽  
pp. 329-332
Author(s):  
P. P. Arapov
Keyword(s):  
High Precision ◽  
Measuring Instruments ◽  
Precision Measuring

Research on High Precision Time Information Transmission Method

2012 ◽  
Vol 468-471 ◽  
pp. 3072-3075
Author(s):  
Guo Ping Zhou ◽  
Ji Cheng Zhang
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Information Transmission ◽  
High Precision ◽  
Time Synchronization ◽  
Clock Pulse ◽  
Transmission Method ◽  
Synchronization System ◽  
Precision Time ◽  
Time Information

Time synchronization system has been widely used in power system. According to the needs of different system, it provides different signals. Usually you can use a GPS clock pulse, serial message, IRIG-B yards and so on. B code contains both plus and serial time message .And the traditional equipment is often used pulse and serial message at the same time. We put forward a method to transmit pulse information and serial message information on a transmission line .And at receiving place, it can restore the signals. It can reduce line costs and outside interferences, is beneficial to the optimization of system.

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