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Wireless sensor networks are constructed by many sensor nodes formed self-organized network. The nodes are randomly deployed in monitored area, which makes the location of the node uncontrollable. Most of applications of WSN are based on location information. The positioning technology becomes more and more attractive. Localization technology is one of the basic techniques in WSN. Localization usually adopts low energy consumption and low cost techniques such as RSSI, TDOA, TOA, AOA, etc for the constrained energy, cost, and hardware resources.
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