摘要
文章对基于相位重合的全同步测频方法进行了研究。相位重合理论是目前比较流行的用于频率测量的理论,在检测被测信号与标频信号的相位重合脉冲后触发闸门,使计数闸门、被测信号和标频信号三者达到全同步,彻底消除了±1个字误差。相位重合检测电路、闸门、计数器等模块均在可编程逻辑器件FPGA中完成,使用方便,易于修改,经仿真达到了预期效果。
In this paper,the complete synchronization frequency measurement method based on phase coincidence is researched.The phase coincidence theory is very popular in the filed of frequency measurement.When the phase coincidence pulse is detected,the gate is triggered.And then the gate,the measured signal and the standard signal will reach complete synchronization.The error of ±1 will be eliminated.The phase coincidence detection circuit,the gate and the counters are completed in the FPGA.It is very convenient to use and easy to amend.This method about the frequency measurement achieves the expected effect by simulation.
出处
《仪表技术》
2010年第9期14-15,22,共3页
Instrumentation Technology
关键词
频率测量
相位重合
全同步
FPGA
frequency measurement
phase coincidence
complete synchronization
FPGA
