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A design of high-precision wide-range digital frequency measuring system
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Update time: 2013/07/25
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HE Zhen-zhong1,2,3, LI Xiao-hui1,2, LIU Ya1,2

(1. National Time Service Center, Chinese Academy of Sciences, Xi′an 710600, China;

2. Key Laboratory of Time and Frequency Primary Standards, National Time Service Center,

Chinese Academy of Sciences, Xi′an 710600, China;

3. Graduate University of Chinese Academy of Sciences, Beijing 100039, China)

Abstract: Because of the restriction of Nyquist sampling theorem, it is difficult to measure the high-frequency signal accurately with the traditional high-precision digital frequency measuring instrument. A high-precision wide-range digital frequency measuring system is developed by the authors, which can conquer the restriction of Nyquist sampling theorem. In this system, the signal is measured through a preliminary process based on the frequency spectrum analysis as well as a precise process based on the low sampling rate method. A 10 MHz signal was measured with the high-precision wide-range digital frequency measuring system, and the measurements show that the relative frequency deviation and the stability are 1.13×10-11 and 1×10-12 respectively.

       Key words: digitalizing; low sampling rate; high-precision frequency measurement

2009 National Time Service Center (NTSC), Chinese Academy of Sciences , All Rights Reserved