基于改进的Sage-Husa自适应卡尔曼滤波的晶振驯服研究与实现  

Research and implementation of taming crystal oscillator based on improved Sage-Husa adaptive Kalman filter

作　　者：王习东 熊偌炎 杨业泉 张浩 冯文杰 王国鹏 Wang Xidong;Xiong Ruoyan;Yang Yequan;Zhang Hao;Feng Wenjie;Wang Guopeng(Hubei Key Laboratory of Intelligent Vision Based Monitoring for Hydroelectric Engineering,Yichang 443002,China;College of Computer and Information Technology,China Three Gorges University,Yichang 443002,China;College of Electrical and New Energy,China Three Gorges University,Yichang 443002,China;College of Science,China Three Gorges University,Yichang 443002,China)

机构地区：[1]水电工程智能视觉监测湖北省重点实验室,宜昌443002 [2]三峡大学计算机与信息学院,宜昌443002 [3]三峡大学电气与新能源学院,宜昌443002 [4]三峡大学理学院,宜昌443002

出　　处：《国外电子测量技术》2023年第6期110-116,共7页Foreign Electronic Measurement Technology

基　　金：国家重点研发计划(2021YFC3001903)项目资助。

摘　　要：二级频标中恒温晶振(OCXO)成本较低,具有较高的短期稳定性,老化会影响时钟守时系统的工作精度和稳定性。全球导航卫星系统(GNSS)驯服晶振的方法结合了GNSS卫星授时长期稳定性高和本地晶振短期稳定性高的特点,实现了两者的优势互补,提升了晶振驯服系统输出频率的准确度和长期稳定性。基于GNSS驯服恒温晶振的硬件系统,设计了基于判别因子的野值剔除方法,改进了基于Sage-Husa的自适应卡尔曼滤波算法。驯服实验结果表明,算法提高了晶振驯服系统输出频率的准确度和长期稳定性,实验系统中恒温晶振频率漂移量的标准差降低了约99.01%,恒温晶振的长期稳定性的Allan方差提高了约3个数量级,达到6.181×10-12。In the second-class frequency standard,oven controlled crystal oscillator(OCXO)has low cost and high shortterm stability.Aging of OCXO will affect the accuracy and stability of the clock system.With the method of global navigation satellite system(GNSS)taming crystal oscillator,it has the complementary advantages of high long-term stability of GNSS and high short-term stability of local crystal oscillator.It improves the accuracy and long-term stability of the output frequency of the taming system.Based on the hardware system of GNSS taming OCXO,an outlier elimination algorithm with discriminant factor and improved Sage-Husa adaptive Kalman filter are designed in this paper.The experimental results show that it improves the accuracy and long-term stability of the output frequency.In the experiment system,the frequency drift of OCXO is reduced by about 99.01%,and the Allan variance of long-term stability of OCXO is increased to 6.181×10-12.

关 键 词：全球导航卫星系统 恒温晶振 自适应卡尔曼滤波 野值剔除 ALLAN方差 

分 类 号：TN92[电子电信—通信与信息系统]