Wireless Sensor Networks (WSN) is becoming one of the most promising technologies in recent years. It is a new pattern of information gathering and processing which integrates technologies of micro-electro-mechanism, embedded computing, distributed information processing and wireless communication. Node localization, topology control, routing protocols are some of the new shoes 2010 fundamental problems of WSN. Among these problems, node localization has been focused as a basic factor for that it is the precondition of many new wedding dresses applications of WSN, such as target identification, surveillance and tracking. Furthermore, some routing cheap evening dresses schemes, information of network coverage, load balance, topology control of WSN depend on the location information of the nodes in networks. So, the study for node localization of WSN possesses great discount wedding gowns significance in the theory and practice, and it will become an important part in the research area.Since the nodes are restricted by size, cost and energy, and WSN always works in the environment which is hard to be accessed, the traditional localization methods of wireless custom made prom dresses networks can't fit the WSN well. The special localization technologies should be designed for WSN. This paper expounds the system architecture, features and applied fields of WSN. Based on this, it thoroughly analyzes the localization technologies of WSN.
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