A Novel Super-High Resolution Phase Comparison Approach
YU Jian-Guo1**, ZHOU Wei1,2, DU Bao-Qiang1,2, DONG Shao-Feng1, FAN Qiao-Yan1
1Department of Measurement and Instrument, Xidian University, Xi'an 710071 2School of Electric and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002
A Novel Super-High Resolution Phase Comparison Approach
YU Jian-Guo1**, ZHOU Wei1,2, DU Bao-Qiang1,2, DONG Shao-Feng1, FAN Qiao-Yan1
1Department of Measurement and Instrument, Xidian University, Xi'an 710071 2School of Electric and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002
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.
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.
2012, Vol. 29 
