摘要
针对局域网中计算机间的时间同步问题,分析了统计同步算法PCS的基本原理,介绍了局域网中网络延迟精确测定的方法,提出了利用一台时统设备实现局域网中PCS算法精度测试的方法,给出了频率漂移的修正公式,并在局域网中对算法性能进行了测试。测试结果表明,计算机时钟的漂移是影响算法精度的主要因素。经过频漂修正,PCS算法性能得到了很大的改善,同步周期较设计周期大大增加,算法同步精度在20min内优于1 ms。
This paper introduced a study on measuring the network delay in LAN. It analyzed the principle of the Statistic Synchronization Algorithms, PCS. At the same time, it brought forward a way of testing the precision of PCS in LAN through a single equipment, presented a correction formula on frequency drift, and had an analysis of the result. As a result, after the correction, the synchronization precision of PCS was better than 1 ms within 20 minutes.
出处
《测绘科学技术学报》
北大核心
2007年第5期377-380,共4页
Journal of Geomatics Science and Technology
