基于本地时钟自校正的无线传感器网络同步方法

Clock Synchronization Method in Wireless Sensor Networks Based on Local Clock Self-Correction

通过分析TPSN同步协议和造成时钟偏差不确定性的各种因素,结合无线传感器网络低功耗的特点及其对时钟同步算法精度的要求,针对TPSN未对时钟频率漂移进行估计的问题,提出一种节点本地时钟自校正方法,并设计了平均时钟偏差指标对一个同步周期内时钟精度进行评价。对比实验结果表明本方法易于实现,在保证同步精度的同时可以延长同步周期,减少同步开销,节约了能耗。

By analyzing TPSN synchronization protocol and various factors that cause uncertainties of clock deviation, combining with the characteristics of low power consumption and the special requirements of synchronization accuracy in Wireless Sensor Networks, aiming at the problem that TPSN does not estimate clock frequency drifting. A method named local clock self-correction is proposes. An index of avarage clock deviation is also proposed to evaluate the accuracy of clock during a synchronization period. The contrast experiment results validate that this method is good feasibility and can prolong synchronization period under guaranteeing synchronization precision, reduce synchronization spending and power consumption.