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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 |
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Cite this article: |
YU Jian-Guo, ZHOU Wei, DU Bao-Qiang et al 2012 Chin. Phys. Lett. 29 070601 |
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Abstract 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.
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Received: 14 October 2011
Published: 29 July 2012
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