矿井电网故障检测WSNs分层时间同步算法

WSNs hierarchical time synchronization algorithm adapted to grid fault detection in mine

结合经典时间同步算法TPSN、RBS的优点,提出了一种能量有效且满足一定精度要求的同步算法RBTP。该算法利用无线通信的广播特性并采用最大似然估计和最小二乘法计算时钟偏移和频偏,进而对时钟进行补偿。仿真结果表明,与TPSN和RBS算法相比,RBTP算法明显减少了节点的能量消耗,提高了同步精度,能够满足井下电网故障定位系统对时间同步的需求。

Combining advantages of classical time synchronization algorithm TPSN and RBS,a new energy-efficient and high-accuracy algorithm RBTP was proposed.The algorithm utilizes character ofbroadcast in wireless communication and adopts the maximum likelihood estimation and the least square algorithm to calculate clock offset and clock skew,then uses the results to compensate the clock.The simulation results show that RBTP algorithm reduces energy consumption compared with TPSN and RBS algorithm,improves synchronization precision,and it can meet the needs of underground grid fault location system for time synchronization.