【摘要】 介绍了授时时钟在变电站自动化系统中 ,在对微机的直接保护中及自动化装置授时中的基本原理 ,提出了利用 GPS接收器与 AT89C5 5单片机系统实现变电站授时时钟的方案 ,给出了时钟的软、硬件设计 ,并详细介绍了装置内部的 GPS秒脉冲 (PPS)信号的软件抗干扰措施及串口通信上的提前发送技术。更多还原

【Abstract】 The scheme of implementing the clock based on GPS receiver, AT89C55 microcontrollor are presented. The mechanism of how a clock to give time to automation equipment either through system computer or not, is described. Then the scheme of the design of software and hardware is presented. The paper also details the anti-jamming technology with software protecting PPS from jamming and the pre-sending technology to meet user′s requirement.更多还原