桂林理工大学学报
桂林理工大學學報
계림리공대학학보
JOURNAL OF GUILIN UNIVERSITY OF TECHNOLOGY
2015年
1期
198-201
,共4页
GPS%时钟同步%恒温晶振%FPGA
GPS%時鐘同步%恆溫晶振%FPGA
GPS%시종동보%항온정진%FPGA
GPS%synchronized clock%OCXO%FPGA
结合恒温晶振时钟无随机误差和GPS秒信号无累计误差的特点,采用GPS测量监控技术,对高精度晶体振荡器的输出频率进行精密测量和校正后作为系统时钟,通过相位同步算法使FPGA的输出PPS信号与GPS的PPS信号同步。系统中使用Nios II+Verilog HDL设计了高分辨率的时间测量和快速校准时钟同步单元,缩短了频率校准和同步时间。实验结果表明:系统同步精度较高、结构简单,并成功地应用于电磁勘探数据采集系统中。
結閤恆溫晶振時鐘無隨機誤差和GPS秒信號無纍計誤差的特點,採用GPS測量鑑控技術,對高精度晶體振盪器的輸齣頻率進行精密測量和校正後作為繫統時鐘,通過相位同步算法使FPGA的輸齣PPS信號與GPS的PPS信號同步。繫統中使用Nios II+Verilog HDL設計瞭高分辨率的時間測量和快速校準時鐘同步單元,縮短瞭頻率校準和同步時間。實驗結果錶明:繫統同步精度較高、結構簡單,併成功地應用于電磁勘探數據採集繫統中。
결합항온정진시종무수궤오차화GPS초신호무루계오차적특점,채용GPS측량감공기술,대고정도정체진탕기적수출빈솔진행정밀측량화교정후작위계통시종,통과상위동보산법사FPGA적수출PPS신호여GPS적PPS신호동보。계통중사용Nios II+Verilog HDL설계료고분변솔적시간측량화쾌속교준시종동보단원,축단료빈솔교준화동보시간。실험결과표명:계통동보정도교고、결구간단,병성공지응용우전자감탐수거채집계통중。
GPS-clock,free of cumulative error and the high precision crystal oscillator,free of random error,thus can be effectively combined.By advanced GPS monitoring and controlling technology,the output frequency of the crystal oscillator is measured and adjusted,by synchronizing FPGA_PPS with GPS_PPS by phase synchronization algorithm. A high-resolution fast-measuring unit and clock synchronized unit are designed by Nios II+Verilog HDL to reduce the time of calibration and synchronization.After experimental verification,the high precise telegraphic synchronized system can be successfully applied in data acquisition system of electromagnetic survey.