A common approach for synchronizing the agents in a Wireless Sensor Network (WSN) is two-way timing stamps exchange mechanism. In this letter, by analyzing the change of accumulated clock offset within each communication cycle, an improved two-state discrete-time state model is proposed. A step further, two Kalman-filter-based estimators are proposed, by which the clock parameters and propagation delays can be estimated. The simulation results show that the proposed estimators outperform the conventional Kalman Filter (KF), especially with respect to the accumulated clock offset.

中文翻译：

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基于双向定时标记交换机制的改进的时钟参数跟踪与测距方法

在无线传感器网络（WSN）中同步代理的一种常用方法是双向定时标记交换机制。在这封信中，通过分析每个通信周期内累积时钟偏移的变化，提出了一种改进的二态离散时间状态模型。进一步，提出了两个基于卡尔曼滤波器的估计器，通过它们可以估计时钟参数和传播延迟。仿真结果表明，所提出的估计器优于传统的卡尔曼滤波器（KF），特别是在累积时钟偏移方面。