计算机科学 ›› 2017, Vol. 44 ›› Issue (2): 117-122.doi: 10.11896/j.issn.1002-137X.2017.02.017
裴旭明,李文艳,朱正航,康凯
PEI Xu-ming, LI Wen-yan, ZHU Zheng-hang and KANG Kai
摘要： 为了降低传感器节点的功耗,应尽可能地让传感器节点在没有业务需求时进入休眠状态。由于传感器节点进入休眠状态后只有RTC时钟模块在运行,且RTC模块内部晶体振荡器受温度等因素的影响较大,造成RTC时钟精度不高进而可能会导致传感器节点不能准确地在预设的时间被自动唤醒,无法完成与汇聚节点的通信业务。为此,提出一种新的无线传感器网络中汇聚节点的本地时钟和传感器节点的RTC时钟同步校准方法,该方法摒弃了以往直接对传感器节点内部RTC模块的晶体振荡器进行温度参数补偿的做法,并由传感器节点根据汇聚节点的本地时钟来调整自己的RTC时钟,以便传感器节点和汇聚节点的时钟动态地保持一致。
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