摘要
介绍了无线传感器网络中的关键技术——时间同步。首先对传统的时间同步在无线传感器网络的适用性做了描述,分析了传统时间同步机制不适合的原因;并重点介绍了专门用于无线传感器网络的几种主流的同步算法,通过对比,总结了各种算法的优点和应用限制。影响时间同步精度的重要原因是不确定性,等待时间的估计容易受到引起不对称双程信息延迟,直接的影响就是同步错误。最后分析了信息传播中不确定性的影响。
A basic technique in wireless sensor networks （WSNs） -time synchronization is mainly introduced, which is essential for many WSNs applications. Traditional time synchronization approaches are presented, and the reason why they are not suitable for WSNs is analyzed; then some time synchronization algorithms specially developed for WSNs are described in detailed. By comparison with each other, the advantage and disadvantage are pointed out respectively. The uncertainty affects the precision of time synchronization, especially the latency. Therefore, the impact of uncertainties in radio message delivery is discussed.
出处
《计算机工程与设计》
CSCD
北大核心
2007年第1期76-77,86,共3页
Computer Engineering and Design
基金
广东省自然科学基金项目(05006623)
