Wireless sensor networks (WSNs) are constructed by minute self-organizing nodes which make up of randomly distributed sensors, data processing units and communication modules. WSNs recurs to all kinds of sensors embedd in the nodes to monitor cooperately, sense and gather the information of various circumstance and monitored object, then, processes the information and transmits it to the terminal user by wireless and self-organizing methods. Finally, it can validly connect the physical polo shirts shop world, the computer world and the human society. In the process of collecting and processing information in WSNs, the information must bind with the node's position so that it is meaningful. Therefor, the technique of locating is one support technique of wireless sensor networks. New cheap jeans shop application circumstance gives the technique of locating in WSNs some new challenges. And security becomes a key factor to the technique of locating due to the open wirless environment and lacking of physical protection in WSNs.The special environment of Underwater Sensor Network gives the localization great ugg boots 2010 challenges. In this page, the depth information is used for localization. Considering the cheap polo shirts difficulty of time synchronization under water, a distance measurement approach of TDoA (time difference of arrival) named TBLT is proposed, which do not rely on time synchronization. According TBLT, a best clothes blog new localization scheme named NLSBT is designed. To combine the depth information with projection technique and use two buoys with mobility simultaneously, NLSBT transforms 3D positioning problem to positioning in a plane, and get the node's position by the relationship of two circles in the same plane. NLSBT is energy conservation because it does not rely on the degree of nodes and the number of beacons, in which the node does not need communicate each other and only listen the beacon packets.
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