CAJ | 학술논문

设计了一种基于NTPv4协议的低成本GPS时钟同步服务器，该时钟同步服务器工作于客户/服务器模式，并在网络中作为主服务器使用。以LPC1768微处理器为核心，设计了时钟同步服务器的硬件电路。采用GR-87型GPS接收机作为GPS模块，文中不仅给出了GPS接收机与LPC1768微处理器的连接方式，还给出了从NMEA-0183消息中解析当前日期和时间的方法。采用DP83848 H芯片作为以太网物理层芯片，设计了时钟同步服务器的以太网接口电路。最后，还给出了实现时钟同步的算法。
설계료일충기우NTPv4협의적저성본GPS시종동보복무기，해시종동보복무기공작우객호/복무기모식，병재망락중작위주복무기사용。이LPC1768미처리기위핵심，설계료시종동보복무기적경건전로。채용GR-87형GPS접수궤작위GPS모괴，문중불부급출료GPS접수궤여LPC1768미처리기적련접방식，환급출료종NMEA-0183소식중해석당전일기화시간적방법。채용DP83848 H심편작위이태망물리층심편，설계료시종동보복무기적이태망접구전로。최후，환급출료실현시종동보적산법。
It designs an NTPv4 based low-cost GPS clock synchronizer .The clock synchronizer works in the client/server mode, and acts as a primary server in the network .Centering on LPC1768 microcontroller, the circuit of the clock synchronizer is designed .A HOLUX GR-87 GPS engine board is used as a reference clock in the clock synchronizer .The paper presents not only the electrical connection between the GPS engine board and LPC1768 microcontroller , but also the method for resolving current date and time from the NMEA -0183 message.The Ethernet interface of the clock synchronizer is also designed using DP 83848H PHYTER.At last, the Algorithm for synchronizing the clock of a client is presented in this paper .