Aiming at issue of clock skew in wireless sensor networks

a time synchronization algorithm based on self-calibration method is presented.Using modified delay measurement time synchronization（DMTS） algorithm

the time of the child nodes can be synchronized to the sink node.And on the premise of ensuring synchronization precision

combines a very low complexity time self-calibration scheme

the child nodes calibrate their clock counts dynamically.Compared with the synchronization algorithm of no calibration

it can greatly reduce the frequency of time synchronization and effectively reduce energy consumption and other overhead of sensor nodes.