期刊论文

High-precision Synchronous Clock Based on Partial Least Squares Regression

中文

电力系统及其自动化学报

1003-8930

2019

31

1

1-6

10.3969/j.issn.1003-8930.2019.01.001

国家自然科学基金资助项目(51577013) 湖南省自然科学***基金资助项目(2015JJ1001).

本校为第一机构

为提高同步时钟的稳定性与精确度,提出了一种基于偏最小二乘回归(PLSR)的高精度同步时钟产生方法。该方法首先将卫星时钟和晶振时钟偏差方程的非线性关系转化为拟线性关系,然后对方程进行 PLSR建模,得到晶振时钟误差估计值。当卫星时钟工作正常时,根据误差估计值修正晶振的频率,对晶振时钟的累计误差实时主动补偿,继而产生高精度同步时钟;当卫星时钟失效时,由晶振时钟参考失效前的误差估计值提供高精度同步时钟。仿真结果表明,该方法产生的同步时钟具备高精度、高稳定性的优点,在卫星时钟失效一段时间后仍可输出稳定性好的高精度时间同步信号。

To improve the stability and precision of a synchronous clock , a method to generate a high-precision synchro-nous clock based on partial least squares regression ( PLSR ) is put forward , which transforms the nonlinear relationship between the satellite clock and crystal oscillator clock deviation equation into a quasilinear relationship. Then , PLSR modeling is performed so as to obtain the estimated value of error of the crystal oscillator clock. When the satellite clock is working well , the frequency of the crystal oscillator will be modified according to the estimated value of error , an...