一种用于传感器网络的全局时钟模型  

Global Time Model in Sensor Networks

作　　者：曾益[1] 胡波[1] 刘顺佳[1] 

机构地区：[1]复旦大学电子工程系,上海200433

出　　处：《小型微型计算机系统》2009年第3期545-550,共6页Journal of Chinese Computer Systems

基　　金：上海市科学技术委员会科研计划项目(07dz15013)资助

摘　　要：由于传感器节点的硬件条件限制,时钟模型的选择极大程度上影响着同步协议的最终性能.根据硬件系统特点,提出一种性能优越且易于实现的全局时钟模型.该模型依据同步协议所提供的全局时钟偏差估计值自行对全局时钟进行校准及频偏补偿,同时还提供了基于全局时钟及本地时钟的软件定时器.实际系统测试结果表明,基于本全局时钟模型的TDFS同步协议取得了更加出色的同步性能,其中补偿后的频偏仅为±0.05ppm且时钟误差的标准差低于0.53微秒.Due to the hardware constraints of sensor nodes, performance of synchronization protocols is highly affected by the global time model. Considering hardware system characteristics, a superior and easy-implementation global time model is proposed. The regulation of virtual global clock and compensation of frequency skew are executed automatically once the periodical global time offset estimations are given by the synchronization protocol. Meanwhile, software timers based on global clock and local clock are provided. Real-world system test results show that based on our global time model, TDFS protocol achieves excellent synchronization precision with frequency compensation error tess than ±0.05ppm and standard variance of global time error below 0. 53 micro second.

关 键 词：全局时钟模型 时钟同步 传感器网络 频偏补偿 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]