基于北斗、短波的高精度时钟系统研究与设计

介绍了北斗、短波授时技术；对高稳恒温晶振及其频率特性进行分析的基础上，设计了一种基于北斗卫星、短波无线电授时的高精度时钟系统；该系统通过利用北斗接收处理模块、短波授时接收模块得到的秒脉冲信号、时间信息，经过延迟修正处理、脉冲滤波、脉冲补偿、脉冲统计得到标准的秒脉冲信号，实现对恒温晶振频率的校准，获得一个短期及长期频率稳定度都比较优良的时间频率标准，同时利用校频后恒温晶振分频出的1pps信号对时间芯片进行校准，对外输出高精度时间信息；对恒温晶振校频系统的基本工作原理及部分模块电路图进行了说明，试验结果表明，在时间不长于1h内，频率准确度优于1×10-10；该系统实用方便的方法达到了将晶体振荡器校准到较高指标的目的。

Research and Design of High Precision Clock System Based on BeiDou and Short-wave technology

Introduced BeiDou, short-wave radio timing technology. Based on analysis of high stability constant temperature crystal and its frequency characteristics, design a high precision clock system based on BeiDou, short-wave radio-technology timing design. The system using BeiDou, short-wave receiving and processing module to get the second pulse signal, the time information, after a delay correction, pulse filter, pulse compensation, pulse statistics then get a standard second pulse signal, realize calibration the crystal oscillator frequency, and obtain a short-term and long-term frequency stability are excellent time and frequency, at the same time using 1pps signal which is from constant temperature crystal to calibrate the time chip, after frequency correction, output a high precision time. Described the basic working principle and some module circuit, the experimental results show that, at the time of not more than 1 hour, frequency accuracy up to 1×10-10 , due to the method is practical and easy , this system will reach the aim of get higher index point of crystal oscillator calibrated.