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Wireless sensor networks provide a novel solution to a wide range of problems across a number of application areas. In many applications, individual sensor nodes are often required to attach so-called "When" and "Where" information to the underlying sensed data. The problem of relative clock synchronization for wireless networks (or distributed networks more generally) is not new, and a number of protocols exist. They consider algorithms based on the Time-Of-Arrival (TOA) stamps measured at individual sensors from a limited number of wireless signals transmitted by certain neighbour nodes in the network.
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