基于平方根-卡尔曼滤波的无线网络仪器时钟同步算法

Clock synchronization algorithm in wireless networked instruments based on square-root Kalman filter

提出基于平方根-卡尔曼滤波算法的时钟同步算法,在保证算法收敛的前提下对时钟偏差和偏斜进行最优估计。算法中提出通信能耗与时钟精度的关系模型,在满足一定精度的前提下校准时钟,既能保证时钟的稳定和精准,又能较少地占用带宽资源,节约通信能耗。最后通过网络模拟器模拟实验论证了算法的性能。

A clock synchronization algorithm in wireless measurement and control network is proposed.It is based on the square-root Kalman Filter to achieve the optimal estimation of the clock offset and skew on the premise of algorithm convergence.The algorithm also puts forward a model of communication cost and clock accuracy to calibrate the clock under certain clock accuracy.This can ensure the stability and accuracy of the clock and reduce the communication cost.Some theoretical and simulation results are presented to illustrate the performance of the proposed clock synchronization algorithm.