高精度低功耗无线传感器网络时间同步算法

通过对无线传感器网络参考广播同步（RBS）算法的研究,针对RBS多跳算法网络开销大和不能实现全网同步的问题,在基于环形网络拓扑的参考广播环形同步（RBRS）算法基础上,提出一种改进的RBRS （IRBRS）算法.该算法引入可变周期同步法：根据贝叶斯最大后验估计原理,估算出最大相位偏差来决定同步周期,从而减少节点同步次数,并且采用最小二乘线性回归法,周期性拟合时钟偏移.运用Matlab环境进行仿真,仿真结果表明：IRBRS算法同步精度显著提高,并且能量消耗显著减少,更有利于延长无线传感器网络的寿命.

High precision and low power consumption time synchronization algorithm for wireless sensor networks

Through research of reference broadcast synchronization（RBS） algorithms for wireless sensor networks （WSNs）, aiming at problem of large amount of network overhead and the whole network synchronization, an algorithm based on references broadcast ring synchronization （ RBRS ） is presented, named improved RBRS （IRBRS） algorithm. The algorithm lead into variable cycle synchronization method. According to principle of Bayesian maximum posterior estimation, estimate the maximum phase offset to determine synchronization cycle to reduce the number of node synchronization,it also can fit clock skew periodically by least square linear regression method. Matlab software is used for simulation, results show that IRBRS algorithm synchronous precision is improved obviously and reduce energy consumption significantly to be better for extend life of wireless sensor networks.