工矿自动化2017，Vol.43Issue(3)：10-15,6.DOI:10.13272/j.issn.1671-251x.2017.03.003
基于GPS与恒温晶振的瞬变电磁同步时钟系统
Synchronous clock system of transient electromagnetic based on GPS and OCXO
摘要
Abstract
In view of problems of poor long-term stability of OCXO and susceptibility to interference and poor short-term stability of GPS,synchronous clock system of transient electromagnetic based on GPS and OCXO was designed."ARM+CPLD" mode is used as core processing unit,and frequency deviation measurement module is used to detect crystal frequency of high frequency signal between two adjacent second pulses,taking GPS second pulse signal as benchmark.The self-adaptive PID controller is used to adjust output frequency of crystal oscillator,which effectively solves the problem that accuracy of control voltage of OCXO is affected because single frequency deviation is too large,and improves stability of the system.Second pulse signal is used as a timer to reset divider at regular intervals,which achieves automatic elimination of cumulative error of OCXO and ensures phase synchronization of output signal.The test results show that the system achieves high precision synchronization of transient electromagnetic transmitter and receiver,synchronization precision is about 270 ns when GPS signal is normal,and synchronization precision is about 350 ns when GPS signal is lost.The system has been successfully applied to transient electromagnetic detection system,a large number of practical application results show that the system has good stability and high synchronization accuracy.关键词
瞬变电磁探测/同步时钟/GPS/恒温晶振/频率偏差测量/累积误差消除Key words
transient electromagnetic detection/synchronous clock/GPS/OCXO/frequency deviation measurement/cumulative error elimination分类
矿业与冶金引用本文复制引用
陈园园,刘玉春..基于GPS与恒温晶振的瞬变电磁同步时钟系统[J].工矿自动化,2017,43(3):10-15,6.基金项目
国家自然科学基金项目(61401526) （61401526）
河南省基础与前沿技术研究计划项目(142102210580) （142102210580）
河南省科技厅重点科技攻关项目(132102210101). （132102210101）
