在周期性信号数字化测量比对中,除A/D量化误差以外还存在取决于两比对信号频率关系的量化相移步进误差。通过分析两种量化误差的产生原因及相互关系,该文提出了利用两种误差的相辅相成关系来量化误差分辨率的稳定性以及影响,在数字化处...在周期性信号数字化测量比对中,除A/D量化误差以外还存在取决于两比对信号频率关系的量化相移步进误差。通过分析两种量化误差的产生原因及相互关系,该文提出了利用两种误差的相辅相成关系来量化误差分辨率的稳定性以及影响,在数字化处理中采用边沿处理技术,能有效地抑制量化误差。实验表明,在10 bit A/D采样分辨率下,测量分辨率较原有A/D测量分辨率提高了一个数量级甚至更高。该方法可以在频率、相位等参数的精密测量、控制中发挥重要作用。展开更多
The physical characteristics of phase quantum are further revealed,based on the proposition of concepts of the greatest common factor frequency,the least common multiple period,quantized phase shift resolution and equ...The physical characteristics of phase quantum are further revealed,based on the proposition of concepts of the greatest common factor frequency,the least common multiple period,quantized phase shift resolution and equivalent phase comparison frequency.Then the problem of phase comparison between different frequency signals is certified in detail.Using the basic principle of phase comparison between different frequencies and the variation law of group phase difference,a point of view on group phase quantization is presented.Group phase quantum is not only an indivisible individual of group phase,but also a basic unit composing group phase difference.It is equal to the equivalent phase comparison period of phase comparison between different frequencies in size.Experimental results show not only a high measurement resolution of 10^(-12)/s in frequency measurement based on group phase quantum,but also a super-high locked phase precision of 10^(-13)/s in active H atomic clock.展开更多
With the improvement of the accuracy of atomic frequency standard and satellite navigation,the high-resolution phase comparison method is necessary.Using the phase synchronous detection principle,a super-high resoluti...With the improvement of the accuracy of atomic frequency standard and satellite navigation,the high-resolution phase comparison method is necessary.Using the phase synchronous detection principle,a super-high resolution phase comparison method between frequency standards is proposed based on the greatest common factor frequency,phase group processing and a common frequency source and so on.This method is mainly dependent on the stability of the common frequency standard and its frequency.The ±1 count error can be eliminated effectively.Therefore,higher than 1 ps resolution can be easily reached with a simple instrument.Experimental results show higher than 10-15/h precision can be obtained in the long-term frequency standard comparison and the measuring precision can reach 10-17 for several days of comparison.展开更多
文摘在周期性信号数字化测量比对中,除A/D量化误差以外还存在取决于两比对信号频率关系的量化相移步进误差。通过分析两种量化误差的产生原因及相互关系,该文提出了利用两种误差的相辅相成关系来量化误差分辨率的稳定性以及影响,在数字化处理中采用边沿处理技术,能有效地抑制量化误差。实验表明,在10 bit A/D采样分辨率下,测量分辨率较原有A/D测量分辨率提高了一个数量级甚至更高。该方法可以在频率、相位等参数的精密测量、控制中发挥重要作用。
基金Supported by the National Natural Science Foundation of China under Grant Nos 60772135 and 10978017the CAST Innovation Foundation of China under Grant No 20080403 and the Open Fund of Key Laboratory of Time and Frequency Primary Standards(CAS).
文摘The physical characteristics of phase quantum are further revealed,based on the proposition of concepts of the greatest common factor frequency,the least common multiple period,quantized phase shift resolution and equivalent phase comparison frequency.Then the problem of phase comparison between different frequency signals is certified in detail.Using the basic principle of phase comparison between different frequencies and the variation law of group phase difference,a point of view on group phase quantization is presented.Group phase quantum is not only an indivisible individual of group phase,but also a basic unit composing group phase difference.It is equal to the equivalent phase comparison period of phase comparison between different frequencies in size.Experimental results show not only a high measurement resolution of 10^(-12)/s in frequency measurement based on group phase quantum,but also a super-high locked phase precision of 10^(-13)/s in active H atomic clock.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10978017 and 60772135the Open Fund of Key Laboratory of Time and Frequency Primary Standards(CAS)+2 种基金the Postdoctoral Foundation of China under No 94469the Basic and Advanced Technology Research Foundation of Hennan Province under Grant No 122300410169the Fundamental Research Funds for the Central Universities.
文摘With the improvement of the accuracy of atomic frequency standard and satellite navigation,the high-resolution phase comparison method is necessary.Using the phase synchronous detection principle,a super-high resolution phase comparison method between frequency standards is proposed based on the greatest common factor frequency,phase group processing and a common frequency source and so on.This method is mainly dependent on the stability of the common frequency standard and its frequency.The ±1 count error can be eliminated effectively.Therefore,higher than 1 ps resolution can be easily reached with a simple instrument.Experimental results show higher than 10-15/h precision can be obtained in the long-term frequency standard comparison and the measuring precision can reach 10-17 for several days of comparison.
