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Target tracking is a main application of Wireless Sensor Networks (WSNs), and has been studied widely. In this paper, the authors study indoor passive tracking problem using WSNs, in which they assume no equipment is carried by the target and the tracking procedure is passive. They propose to use light to track a moving target in WSNs. To their best knowledge, this is the first work which tracks a moving object by using light sensors and general light sources. They design a novel probabilistic protocol (system) iLight to track a moving target and several efficient methods to compute the target's moving patterns (like height, moving speed etc.) at the same time.
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