Research On Self-localization Techniques In Wireless Sensor Networks

With the rapid development of wireless communication technology,sensor technology and embedded technology,wireless sensor networks have emerged as the focus of research topics all over the world recently.The sensor nodes localization technology is one of the key technologies of wireless sensor networks,and plays an important role in the application's effectiveness.Recently,there are many kinds of nodes localization algorithms which have been studied all over the world already,but each has its own characteristics, simultaneously has its own suitable situation.This thesis firstly makes a comprehensive analysis of several common localization algorithms recently,and undstands each characteristics of their own. Considering the complexity and accuracy of the algorithm, a DV-Hop(Distance Vector-Hop) localization algorithm is studied in detail. The basic principle of algorithm is given, and the shortcomings of the algorithm is also analyzed.Secondly, in order to improve the localization accuracy,the DV-Hop algorithm is improved, and tested by simulation. The simulation results show that with the improvement of calculation method on average size for one hop and the introduction of the centroid algorithm,a more accurate nodes localization is achieved.Finally, the work of the thesis are summarized, and future work is prospected.