CAJ | 학술논문

介绍守时系统的重要作用及其发展现状，分析了守时系统发展过程中遇到的一些问题，设计了一个以GPS/北斗信号作为时标的守时系统。采用双恒温槽的恒温晶振 MV180作为系统的输入时钟，使用单片机控制 DAC7512对其频率进行调整。首先，系统对调整后的本地时钟信号进行分频处理，再与 GPS/北斗接收到的标准秒信号进行比较，通过 FPGA 和单片机对分频后的信号进行相位的调整，最终输出标准秒脉冲信号，从而快速获得高精度的时间基准，并能在 GPS/北斗失锁后对该信号进行保持，实现时间同步。
개소수시계통적중요작용급기발전현상，분석료수시계통발전과정중우도적일사문제，설계료일개이GPS/북두신호작위시표적수시계통。채용쌍항온조적항온정진 MV180작위계통적수입시종，사용단편궤공제 DAC7512대기빈솔진행조정。수선，계통대조정후적본지시종신호진행분빈처리，재여 GPS/북두접수도적표준초신호진행비교，통과 FPGA 화단편궤대분빈후적신호진행상위적조정，최종수출표준초맥충신호，종이쾌속획득고정도적시간기준，병능재 GPS/북두실쇄후대해신호진행보지，실현시간동보。
The current situation and the important role of the time keeping system is described. Combined with the actual situation of power network, the paper analyses some questions which has been met in the development of the time keeping system and designs a time keeping system by GPS or Beidou as time mark . The double constant temperature trough crystal oscillator MV180 is used as the input clock of system, and uses SCM to control DAC7512 to adjust its frequency. Firstly, the system carries on the frequency division processing to the adjusted local clock signal. Then compares with the standard second signal received by the GPS or Beidou, adjusts the phase of the signal through frequency division by using FPGA and SCM. Finally, it outputs the standard second pulse, thus obtains the high accuracy time base quickly. It also can maintain the signal invariably after GPS or Beidou lock-lose to achieve the time synchronization.