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In near future, Wireless Sensors Networks (WSN) are expected to be deployed for a vast variety of applications. For many of these applications, sensed data individually have no meaning without proper knowledge of position where the data was sensed. Although there have been proposed algorithms for localization, many of them fall short with respect to complexity, cost, security and accuracy. Some issues that still hinder the efficiency of available localization techniques are multi-path propagation, security attack (internal and external attack by faulty or malicious nodes), and sometimes specific network topologies. For example, the Long-Thin (LT) topology of WSN is highly prone to localization error due to its special distribution pattern.
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