单片机与嵌入式系统应用2025，Vol.25Issue(10)：17-25,9.DOI:10.20193/j.ices2097-4191.2025.0048
基于锁相环结构的恒温晶振频率锁定系统设计
Design of OCXO frequency locking system based on phase-locked loop structure
严妮 1陈书鹏 1吕宗阳1
作者信息
- 1. 长安大学信息工程学院,西安 710064
- 折叠
摘要
Abstract
Frequency standards play a vital role in modern science technology and industry.To address the issue of poor long-term stability in constant temperature crystal oscillator caused by factors such as crystal aging and temperature variations,this paper designs a constant temperature crystal oscillator frequency locking system based on a phase-locked loop(PLL)structure.The system utilizes the GPS sig-nal received by the u-blox NEO-M8N module as the reference source,and employs STM32F103C8T6 as the control chip to lock the fre-quency of the constant temperature crystal oscillator OC5SC25 through the PLL structure.Using the extended Kalman filter and PID control algorithm,the long-term stability of the primary frequency standard and the short-term frequency accuracy of the secondary fre-quency standard are combined.The test results show that the system realizes the frequency lock of the 10MHz constant temperature crystal oscillator,enabling the frequency of the constant temperature crystal oscillator to operate at a higher stability and accuracy.Its average frequency accuracy reaches 3.28×10-12,which is nearly 4 orders of magnitude higher than the initial frequency accuracy.This effectively improves the limitations of the constant temperature crystal oscillator in long-term stability.关键词
频率锁定/恒温晶振/STM32F103C8T6/锁相环/卡尔曼滤波/PID算法Key words
frequency locking/OCXO/STM32F103C8T6/phase-locked loop/Kalman filter/PID algorithm分类
信息技术与安全科学引用本文复制引用
严妮,陈书鹏,吕宗阳..基于锁相环结构的恒温晶振频率锁定系统设计[J].单片机与嵌入式系统应用,2025,25(10):17-25,9.
