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Wireless sensor networks were initially deployed for military applications. Gradually researchers found them to be very useful in applications like weather monitoring, target tracking, agriculture, industrial applications, and recently smart homes and kindergartens. All the WSN applications need partial or full time synchronization. Applications like acoustic ranging, target tracking or monitoring need a common notion of time. Every data is time stamped sensor nodes local clock. Two main approaches to time synchronization are receiver-receiver synchronization and sender-receiver synchronization. In this paper, the authors analyze the receiver-receiver synchronization and discuss the results of simulation in network simulator.
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