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The authors study the important problem of tracking moving targets in wireless sensor networks. They try to overcome the limitations of standard state of the art tracking methods based on continuous location tracking, i.e., the high energy dissipation and communication overhead imposed by the active participation of sensors in the tracking process and the low scalability, especially in sparse networks. Instead, their approach uses sensors in a passive way: they only record and judiciously spread information about observed target presence in their vicinity; this information is then used by the (powerful) tracking agent to locate the target by just following the traces left at sensors.
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