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Time synchronization is important for many applications running in wireless sensor network. A classical algorithm, Timing-Sync Protocol for Sensor Networks (TPSN), has been widely adopted, which can achieve of the goal of high accuracy and energy-efficiency. However, the accuracy of TPSN algorithm will decrease in practical environments since communication conflicts occur in an ad-hoc wireless environment. We propose an improved algorithm that can resolve conflicts in the process of synchronization. Both theoretical analysis and simulations show that our method achieves better accuracy and uses less energy consumption when node density of netwok increases. [ABSTRACT FROM PUBLISHER]

For the demand of lower localization costs, less communications costs and higher accuracy of objects tracking under mine pit, weighted centroid localization algorithm based on RSSI is introduced to localize the node. This algorithm shows relatively high accuracy by simulation and is suitable for the localization of mine personnel. [ABSTRACT FROM AUTHOR]