摘要
为了提高频率信号测量的分辨率,根据信号的时空转换关系和群相位重合检测技术,提出了一种基于长度游标的超高精度频率测量方法.光和电磁波信号在空间或特定介质中的传递速度是高度准确和稳定的,利用这一自然现象对被测时间信号与其在长度上传输延迟的重合检测来测量短时间间隔,可较易获得ns到10 ps级的测量分辨率.该方法利用信号在导线中传输时延的稳定性形成长度游标,大大减小了标频信号与被测信号间相位重合信息中的模糊区,有效地逼近了最佳相位重合点,提高了测量精度.信号传递速度的稳定和准确特性使测量精度比传统基于频率处理的方法更高,价格更有优势,而且能解决特高频率的测量问题.
According to time-space conversion relationship of signals and phase coincidence detection technology, a super-high precision frequency measurement method is proposed based on length vernier in order to improve measurement resolution of signal. High accuracy and stability of the speed of light and electromagnetic signals during the transmission in space or specific medium enable the measurement of short time interval, which uses the coincidence detection of signal＇s transmission delay in length. Based on this, measurement precision from ns to 10 ps can be easily obtained. The method develops the length vernier utilizing the stability of signal＇ s transmission delay, minimizes the fuzzy region of phase coincidence between the standard frequency signal and the measured signal, approaches the best phase coincidences, and therefore improves the measurement precision that is higher than the precision provided by the traditional methods based on frequency processing. Besides, the method costs less than the traditional methods and can also solve the problem of the measurement of super-high frequency.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2011年第3期1-7,16,共8页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金项目(10978017
60772135)
关键词
时空关系
延时移相
长度游标
相位重合检测
time-space relationship
delay-time and phase shift
length vernier
phase coincidence detection
