摘要
针对广域分布环境中,多台数据采集仪时间同步的难题,根据GPS授时原理,应用GPS长期稳定高精度GPS秒脉冲,设计了一种高精度的同步数据采集系统。系统核心由数据采集单元、微控制器、复杂可编程逻辑、带有秒脉冲输出的GPS模块组成。实验带有8路并行的高速AD通道,结果证实了该采集功能的可靠性,异地同类型设备的时间同步不确定度约为5μs。
In order to solve the problem of time synchronization of more than one data acquisition instruments in the wide-area-distributed environment,according to the principle of GPS and the GPS second-pulse with the long stability and high-precision,a high precision system of synchronous data acquisition is designed.The system consists of data acquisition unit,micro-controller,complex programmable logic device and GPS module with second-pulse output.The experiments with 8-channel parallel high-speed AD sampling,the result shows that the acquisition function is reliable.The time synchronization uncertainty of the same type of device in different place is within 5μs.
引文
[1]习友宝,古军.分布式网络化技术综述[J].仪器仪表学报.2002,23(5):212-214.
[2]李鑫旺.无线分布式测试系统中测试节点的数据存储技术研究[D].太原:中北大学,2010.
[3]戚淑芬,李明,李利洁,等.嵌入式GPS数据采集系统的设计与实现[J].仪器仪表学报,2006,27(增刊1):127-129.
[4]张承学,龚庆武,胡志坚.基于GPS同步采样装置的研制及其应用[J].电力系统自动化,2000,24(10):49-52.
[5]阳继军.基于GPS授时的地震采集系统同步系统设计[J].石油仪器,2009,23(1):82-87.
[6]罗冯涛,王渝.ADμC812单片机控制系统的开发[J].现在电子技术,2002(2):10-12.
[7]徐志军,徐光辉.CPLD/FPGA的开发与应用[M].电子工业出版社,2002.
[8]谭会生,张昌凡.EDA技术及应用[M].西安:西安电子科技大学出版社,2001.