摘要
利用全球导航卫星系统(GNSS)接收机输出的秒脉冲(1PPS)信号作为标准信号,对本地振荡器输出的1PPS信号实施同步,实现了时间同步系统。针对GNSS接收机输出的1PPS信号抖动噪声对时间同步系统同步性能的影响,研究了一种抑制抖动影响的滤波器。滤波器采用小波滤波器结合滑动平均滤波器的方式,其中小波滤波采用自定义的阈值及阈值函数。对所实现的滤波器开展了滤波处理实验,实验结果表明,该滤波方案对GNSS接收机输出的1PPS信号的噪声抑制效果优于常用的卡尔曼滤波器,所实现的时间同步系统输出的1PPS信号精度达到1.17 ns,相比于GNSS接收机输出的1PPS信号精度提高一个数量级。
We have realized a time synchronization system using the one pulse per second(1 PPS)signal provided by the global navigation satellite system(GNSS)receiver as reference signal to synchronize the 1 PPS signal output of the local oscillator.Aiming at the influence of the jitter noise of GNSS receiver 1 PPS signal on synchronization performance of the time synchronization system,we designed a filter that can suppress the jitter effect.The filter adopted the manner of wavelet filter combining with moving average filter,in which the wavelet filter used custom-defined threshold and threshold functions.Filtering processing experiment was conducted using the designed filter,the experiment results reveal that the jitter noise suppression effect for the 1 PPS signal of the GNSS receiver using the proposed filtering scheme is better than that using commonly used Kalman filter.The 1 PPS output signal accuracy of the proposed time synchronous system reaches 1.17 ns,which is one order superior to the 1 PPS signal accuracy of GNSS receiver.
作者
吴红卫
李铎
顾思洪
Wu Hongwei;Li Duo;Gu Sihong(University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Atomic Frequency Standards,Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2019年第2期182-189,共8页
Chinese Journal of Scientific Instrument
基金
国家重点研发计划(2017YFB0503200)项目资助
关键词
时间同步
数字滤波
全球导航卫星系统
time synchronization
digital filtering
global navigation satellite system(GNSS)
