基于CPLD的时间信号精确同步研究  

CPLD-based Precision Synchronization of Timing Signals

作　　者：周永亮[1] 王军民[1] 薛良玉 胡文宝[1] 

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学)长江大学地球物理与石油资源学院,湖北荆州434023 [2]华北油田二连分公司,内蒙古锡林浩特026000

出　　处：《石油天然气学报》2011年第4期105-108,118,共4页Journal of Oil and Gas Technology

基　　金：国家"973"规划项目(2007CB209607);国家自然科学基金项目(40727001;44704073)

摘　　要：电磁波阵列数据采集系统要配合井中大功率电磁脉冲源使用,为了能够严格同步发射地震波、采集反射波,需要精确的时间同步信号。主要论述在复杂可编程逻辑器(CPLD)的控制下,结合恒温晶振(OCXO),实现全球定位系统(GPS)失效情况时的精确时间同步。在设计中采用CPLD作为GPS和OCXO同步时钟的控制和数据处理CPU,加速数据处理进度,提高了同步精度,在GPS失效时实现秒脉冲的平滑切换。且用CPLD取代在同步时钟设计中应用较多的单片机结构,使系统更小功耗更低。Electromagnetic array data acquisition system should match the high-power electromagnetic pulse source in wells,in order to launch seismic waves and collect the reflected waves rigorously,simultaneously it required precise time synchronization signals.The conditions under the control of the CPLD were mainly discussed,in combination with Over Controlled Crystals Oscillator(OCXO),the precise time synchronization of global positioning system(GPS)was realized.In the design,CPLD is used as CPU and OCXO of clock synchronized control and CPU for data processing to accelerate the progress of data processing for improving the synchronization accuracy.The common MCU structure is replaced by CPLD for smaller and lower power consumption of the system.

关 键 词：复杂可编程逻辑器 全球定位系统 恒温晶振 通用异步接收发送器 

分 类 号：P631.325[天文地球—地质矿产勘探]