基于频偏估计的无线传感器网络时间同步算法

针对无线传感器网络经典同步算法稳定性较差，时钟相偏和频偏联合校正算法存在高开销等问题，提出一种基于频偏估计的无线传感器网络时间同步算法（CSMS算法）。CSMS算法采用低开销相偏和频偏估计方法，提高了成对节点的同步精度和稳定性；结合分层和广播监听构建了同步策略，能够保证算法的稳定性和同步精度，实现了与邻居节点及根节点的同步，同时优化了同步总开销。实验结果表明，CSMS算法能够有效地平衡同步能耗、同步精度及同步稳定性。

Timing synchronization algorithm based on clock skew estimation for WSN

In order to solve the problem of poor synchronization stability on classical synchronization algorithm, high overhead on joint clock offset and skew correction synchronization algorithm in wireless sensor network, a timing synchronization algorithm based on clock skew estimation for WSN (CSMS) was proposed. The algorithm adopted low-overhead clock offset and skew estimation method to improve the synchronization precision and stability of paired node. At the same time of guaranteeing the stability and accuracy, it realized synchronization with the root node and the neighbors, and optimized synchronization overhead by using the combination of hierarchical network structure and radio listening. The experimental results show that the CSMS algorithm balances energy consumption, accuracy and stability of synchronization.