Wireless Sensor Networks (WSN) is a novel technology on acquiring and processing data information, which integrates sensor techniques, embedded computation, low-power electronic techniques and wireless communication technology. WSN has broad application prospects in medical and health, environmental monitoring and military areas etc. Node localization is the premise and basis of many applications in sensor networks such as target acquisition and tracking, which is also one of the hot issues in the study of WSN.This thesis focuses on the problem of self-localization in WSN and makes thorough discussion and research on it. The concrete is as follows:1. Range-free localization algorithms and technology are discussed thoroughly. The principles and performance of several representative range-free localization approaches are studied and compared in detail.2. Node localization in wireless sensor networks is treated as a functional dual of target tracking from a novel perspective in the dissertation.
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