| 基于差拍的频标比对系统的性能比较 |
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| 引用本文： | 刘娅,李孝辉,王文利.基于差拍的频标比对系统的性能比较[J].时间频率学报,2009,32(1):22-28. |
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| 作者姓名： | 刘娅 李孝辉 王文利 |
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| 作者单位： | 1. 中国科学院国家授时中心,西安,710600;中国科学院研究生院,北京,100039
2. 中国科学院国家授时中心,西安,710600 |
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| 基金项目： | 中国科学院知识创新工程重要方向项目，中国科学院"西部之光"人才培养计划项目 |
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| 摘 要： | 针对差拍计数器测量系统和差拍数字频标比对系统各自的频率测量特性、精度表现等方面的差异，建立了基于差拍技术的频标比对平台以便进行测试比较。分析了这两套系统的技术要点及实现流程，详细阐述了差拍数字频标比对系统性能较高的原因，并对这两套系统的综合性能进行了测试和比较分析。差拍计数器测量系统所得测量值的稳定度（A11an方差，τ=1S）为4．7×10^-12，差拍数字频标比对系统所得测量值的稳定度为3×10^-14，后者比前者提高了近两个数量级。
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| 关 键 词： | 频标比对 差拍 数字测频 虚拟仪器 |
Performance Comparison of Frequency Standard Measurement Systems Based on Beat-Frequency Method |
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| LIU Ya,LI Xiao-hui,WANG Wen-li.Performance Comparison of Frequency Standard Measurement Systems Based on Beat-Frequency Method[J].Journal of Time and Frequency,2009,32(1):22-28. |
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| Authors: | LIU Ya LI Xiao-hui WANG Wen-li |
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| Institution: | LIU Ya, LI Xiao-hui, WANG Wen-li (1. National Time Service Center, Chinese Academy of Sciences, Xi＇an 710600, China; 2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China) |
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| Abstract: | A frequency standard comparison platform based on beat-frequency technique has been designed to evaluate the difference of performance between the periodic frequency measurement with counter and the digital beat-frequency signals processing with computer, the fundamental of measurement and realization of the two sets of systems are analyzed. The factors which result in the high performance of the digital beat frequency measurement system are expounded. The comprehensive performances of the two sets of systems have been tested and analyzed. The stability of the measured values obtained with the counter method is 4.7×10^-12 （Allan Deviation, τ= 1s ）, whereas the stability of the measured values obtained with the digital method is 3×10^-14, almost two orders better than the former. |
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| Keywords: | frequency standard comparison beat-frequency digital frequency measurement virtual instrument |
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