基于单片机和GPS信号的校频系统

A Frequency Calibration System Based on Single Chip Processor and GPS Signal

介绍一种基于INTEL 80C196KC单片机的校频系统,包括系统的设计原理、硬件组成和软件实现。该系统通过利用GPS接收机得到的1PPS秒脉冲信号,实现对晶体振荡器频率的校准,从而获得一个短期及长期稳定度都比较优良的时间频率标准。该系统采用了量化时延原理进行短时间间隔比对,对测量数据进行卡尔曼滤波处理。

A frequency calibration system based on INTEL 80C196KC single chip processor is introduced, dealing with the design principle, hardware composition and software realizing. The 1PPS signal from GPS receiver is applied to the calibration system in order to calibrate the frequency of the crystal oscillators, thus obtaining a time-frequency standard with good stability in both short-term and long-term. The quantized time delay method is adopted for comparison of short time intervals, and a Kalman filtering algorithm is applied to processing of the measurement data.