摘要
高稳定度时钟广泛应用于广播电视播出发射系统中。基于GPS授时功能,将GPS秒脉冲信号(1 PPS)分频处理,可大大减少随机误差,时钟用分频后的1 PPS微调,可得到高稳定度时钟。利用低成本的VCTCXO和STM32F051单片机等器件设计了一个高稳定度时钟模块,介绍了设计思路及设计过程,包括电路框图、程序流程等,经测试,频率均方误差小于2×10-9。时钟模块成本低、体积小、使用灵活,具有较高的应用价值。
Frequency standard is widely used in broadcasting applications .Division of 1 pulse-per-second (1PPS) signal from Global Positioning System ( GPS) receiving units provides more accurate time standard .It can be used to adjust a frequency standard .A frequency standard is implemented with low-cost VCTCXO and STM32F051.Design details are introduced;Include block diagram , flow chart, etc.RMSE of presented fre-quency standard is tested to be below 2 E-9 .The frequency standard is tiny , flexible and low-cost .So it can be used in many applications .
出处
《中国有线电视》
2014年第6期733-735,共3页
China Digital Cable TV