High-precision Frequency Drift Compensation Study of High-performance Rubidium Atomic Clock

doi:10.11938/cjmr20233080

Abstract

Abstract:

With their high reliability, small size and low power consumption, rubidium atomic clocks are widely used in the fields of navigation, communication, etc. In particular, rubidium atomic clocks for navigation satellites have developed excellent stability. However, their inherent frequency drift characteristics (about E-12 to E-13/day) will deteriorate their long-term performance and affect the autonomous punctual timing of satellites. In this paper, we fully analyzed the frequency data of high-performance rubidium atomic clocks, aiming to figure out the physical mechanism behind the frequency drift. A high-precision frequency drift compensation scheme is proposed and experimentally verified. The results show that the drift rate of high-performance rubidium clock can be maintained in the order of E-15/day within 60 days without external taming, and the day stability can reach the order of E-15 (Allan variance), which greatly improves the autonomous punctual timing ability of rubidium atomic clock．

Key words: rubidium atomic clock, frequency drift, frequency drift compensation, autonomous punctual timing

CLC Number:

O482.53

XU Junqiu, LI Junyao, ZHAO Feng, KANG Songbai, Wang Pengfei, Ming Gang. High-precision Frequency Drift Compensation Study of High-performance Rubidium Atomic Clock[J]. Chinese Journal of Magnetic Resonance, 2024, 41(2): 184-190.

Figures/Tables 6

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模型	均方根	预测的有效时长	剩余总漂移率	失效前剩余漂移率
线性模型	8.27E-13	20天	6.3E-15/天	9.4E-15/天
双e指数模型	2.49E-13	40天	4.3E-15/天	9.5E-15/天
线性-扩散模型	3.13E-14	60天	3.8E-15/天	9.4E-15/天
线性-对数模型	3.06E-13	35天	4.7E-15/天	9.3E-15/天

实验设备	性能参数
VCH-314比相仪	测量误差
	1 s	1.9E-14
	10 s	2.4E-15
	100 s	5.0E-15
	1000 s	8.6E-17
CH-75主动氢钟	频率稳定度
	1 s	2.0E-13
	10 s	3.0E-14
	100 s	7.0E-15
	1000 s	3.0E-15
	1天	3.0E-16
	漂移率	<3.0E-16/天
相位微跃计	调节精度	1 pHz
	调节范围	1 Hz