| 摘要: |
| 芯片级原子钟是一种体积小且功耗低的高精度时钟源,具有广泛的用途。针对这一特点，设计了基于GNSS的芯片级原子钟驾驭算法。以GNSS系统时作为参考，测量芯片级原子钟与GNSS系统时间的钟差，并对芯片级原子钟进行钟差建模，获取其特征参数。通过乒乓法计算出钟驾驭调整量，对芯片级原子钟进行控制，最终将芯片级原子钟驾驭到GNSS系统时间上。经过实验验证，在驾驭时间常数为100s的情况下，芯片级原子钟与GNSS系统时间的时钟同步误差在-7.5~7.5ns之间；1h频率准确度为5.8×10-13；平均时间为10000s时的频率稳定度为3×10-13。 |
| 关键词: GNSS可驯钟 芯片级原子钟 最小二乘法 时钟同步 |
| DOI： |
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| 基金项目:中国科学院“西部之光”B类计划（XAB2018B15） |
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| Research on the Method of GNSS-Disciplined Chip-Scale Atomic Clock |
| QIAO Guang-xin,ZHANG Hui-jun,LI Bo,LI Xiao-hui |
| (National Time Service Center, Chinese Academy of Sciences, Key Laboratory of Time and Frequency Standards, Chinese Academy of Sciences, Xi'an 710600, China;School of Electronic，Electrical and
Communication Engineering， University of Chinese Academy of Sciences, Beijing 100039, China) |
| Abstract: |
| Chip-Scale Atomic Clock(CSAC) is a high-precision clock source with small size and low power consumption which has a wide range of applications.In view of this characteristic, this paper designs a CSAC control algorithm based on GNSS. Taking GNSS system time as reference, the clock difference between CSAC and GNSS system time is measured, and the clock error model of CSAC is built to obtain its characteristic parameters. The clock control adjustment is calculated with the ping-pong algorithm to control the CSAC, so that the time of the CSAC and GNSS time system can be synchronized. According to the analysis of test result, when the disciplining time constant is 100s, the clock synchronization error between CSAC and GNSS receiver is -7.5~7.5ns. The frequency accuracy of 1h is 5.8×10-13. The frequency stability of 10000s is 3×10-13. |
| Key words: GNSS disciplined oscillator Chip-scale atomic clock Least squares method Clock synchronization |
