Time Synchronization Algorithm for Wireless Sensor Networks Based on Frequency Offset Estimation

Abstract

Aiming at solving the poor the classical synchronous algorithm stability in wireless sensor network and high overhead of clock phase offset and frequency offset, a synchronization algorithm (CSMS algorithm) was designed for wireless sensor networks based on frequency offset estimation. The CSMS algorithm used the low overhead phase bias and frequency offset estimation method to improve the synchronization accuracy and stability of the pair nodes. At the same time, a synchronization strategy was built based on layering and broadcast monitoring, which ensured the stability and synchronization accuracy of the algorithm, realized the synchronization with neighbor nodes and root nodes, and optimized the total synchronization cost. Among them, the CSMS algorithm was mainly divided into two stages: level discovery phase, which was used for generating a layered structure of network; synchronization phase, used to estimate clock offset and frequency offset between pairs of nodes. The experimental results showed that the CSMS algorithm can effectively balance the synchronization energy consumption, synchronization accuracy and synchronization stability. As a result, it is summed up that dynamic adjustment of the nodes clock deviation is realized, the long-term stability of synchronization is ensured, and the precision of synchronization is improved.