一种原子钟频率净化的环路最优带宽求解方法  

A method for solving the optimal bandwidth for atomic clock clean- up

作　　者：鄢然 刘军良[1] 郑晓龙 武建锋[1,2] 胡永辉 YAN Ran;LIU Jun liang;ZHENG Xiao long;WU Jian feng;HU Yong hui(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100190,China;Rocket Force University of Engineering,Xi’an 710025,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院大学,北京100190 [3]火箭军工程大学,西安710025

出　　处：《时间频率学报》2022年第4期286-293,共8页Journal of Time and Frequency

基　　金：装备技术基础科研资助项目(E054JK1601)。

摘　　要：针对几种不同类型不同阶数的锁相环,分析了获取锁相环最优带宽已有方法的局限性,提出了一种原子钟频率净化的锁相环最优带宽求解方法。该方法结合“相噪交点法”,提出利用环路传输函数及误差函数幅频特性曲线交点与相位噪声谱交点的偏离程度,求解并评估环路最优带宽。通常采用的最优带宽求解规则只有在满足一定条件下,才能达到良好的原子钟频率净化效果。本文提出的求解方法对前人关于锁相环最优带宽的研究做出了进一步的补充和完善,克服了单一使用“相噪交点法”所带来的问题,仿真试验也验证了该方法的正确性。仿真结果表明该方法相较于“相噪交点法”,原子钟频率净化效果改善明显,净化效果在交点附近最佳可改善1个量级。Aiming at several different types of phase locked loops(PLLs)with different orders,the limitations of the existing method of obtaining optimal bandwidth of PLL are analyzed,and a method for solving the optimal bandwidth of PLL for atomic clock clean up is proposed.Combining the“phase noise spectrum crossing”,the optimal bandwidth of the loop is evaluated by the degree of deviation between the intersection of the phase noise spectrum and the amplitude plot of system and error transfer functions.Only under certain conditions can the optimal bandwidth solving rule be used to achieve good performance for atomic clock clean up.The method presented in this paper complements and improves the previous studies on the optimal bandwidth of PLL,overcomes the problem caused by using the“phase noise spectrum crossing”alone,and the numerical simulations have demonstrated the correctness of the approach proposed.The simulation results show that the effect of the proposed method is obviously improved compared with the“phase noise spectrum crossing”,and the efficiency of clean up can be improved by one order of magnitude near the intersection.

关 键 词：原子钟 频率净化 锁相环 最优带宽 

分 类 号：TM935.115[电气工程—电力电子与电力传动]