Study On Node Localization Management Technology In Wireless Sensor Networks

When sensor networks are established several anchor nodes are speciallyarranged. These nodes location information should be clear. Anchor nodes doself-positioning by some other means，but the cost is more higher. Thus, designerscan not make each sensor node possess the self-positioning ability. So the Variouslocalization technique of wireless sensor network emerges as the times require. ThePrinciple goal of WSN is that How to realize the high一accuracy to meet theapplication.At present，the node localization has become a very hot issue in the research ofWSN. This Paper deals with localization algorithms in WSN, and analyses andsummarizes the advantages and shortcomings of varies of localization algorithms,aswell as the main factors affecting the localization accuracy. Most of currentlyresearch focus localization algorithms，but on estimation of error through verifyingthe position of nodes researches and the management of nodes and data are few.Hence it is critical to research node location information and how to select anchornodes correctly and manage node and data.Aiming at the existing problems in current methods，new algorithms--TriangleLocalization Algorithm is also proposed. The innovation of this Paper lies in thefollowing four aspects:1.The method for analyzing the position relationship between anchor nodes hasbeen investigated and given the location of triangle algorithms. In two dimensionalplane, locating a target node requires three anchor nodes， which has a significantselected position. If the selected anchor node does not fit, this cannot locate theposition of unknown node. Therefore， before localization, selecting the optimumanchor node combination in accordance with the proposed scheme, and then locatingthe node can improve the accuracy of localization. This method provides reliablebasis for the selection of anchor node in localization algorithm to improve locationaccuracy and location coverage.2.In localization based on mobile anchor node, the path of mobile anchor alongwith has a great influence for positioning performance, the paper improved the pathdynamic planning to look for the best path. 3.As complex and low query efficiency of WSN data, a method using hash tableto process the data in the location and tracking is proposed. The construction of hashtable and querying method are presented. It improved the query efficiency.4.Management Data which WSN node acquired data allocation based on GM.