摘要
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.
出处
《传感技术学报》
CAS
CSCD
北大核心
2008年第8期1448-1452,共5页
Chinese Journal of Sensors and Actuators
基金
国家创新群体基金资助项目(NCRGSFC60421002)
国家高技术研究发展计划资助(863计划2006AA040301)
浙江省重大科技专项课题资助(2006C11109)
关键词
时钟同步
无线传感器网络
自校正
频率补偿
clock synchronization
WSN
self-correction
frequency compensation