摘要
针对高精度的频率测量,分析了相位检测法的测量误差,根据分析结果提出并实现了一种基于FP-GA实现的频率测量方法。该方法利用FPGA器件门时延小、电路稳定的特性,采用相位重合检测的改进方法,降低了测量时的±1计数误差。对其进行的误差分析表明,其测量精度约为10-11/τ量级。研制样机的实际测量数据表明,该方法满足高精度、低成本的频率测量要求,具有大规模推广应用价值。
To investigate high-accuracy frequency measurement, the measurement error of the phase detection method is analyzed. According to the analyse results, a method based on FPGA technology is proposed and implemented. Utilizing the characteristics of shorter delay of internal gates and more stabilizable circuit in FPGA, the 4-1 count error is reduced. The error analysis shows that its accuracy is approximately 10 ^11/r order of magnitude. The actual measurement data show that the method meets the requirement of high-accuracy and low cost frequency measurement. It is feasible to be applied widely.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2008年第5期981-983,共3页
Systems Engineering and Electronics
基金
国家自然科学基金资助课题(1070300460072037)
关键词
频率测量
相位检测
相位重合点
FPGA
门时延
frequency measurement
phase detection
phase coincidence
FPGA
gate delay
