Research On Node Localization Technology In Wireless Sensor Network

Wireless sensor network, a novel data acquisition technique, integrates multifold subjects including microelectronic, wireless communication and wireless network, and is widely used in industrial controlling, military, medical assistance and environmental monitoring fields. In most applications, determining the physical positions of sensor nodes is the basic requirements. However, a large number of sensor nodes are deployed randomly, furthermore the nodes have limited software and hardware resources, therefore, it is meaningful to design an effective localization algorithm to identify the position of each node.The research status of wireless location techniques and Positioning systems for WSN are summarized based on the study of a lot of related literatures, In this thesis, the principles and characteristics of related approaches on WSN are discussed and presented. The criterion of performance evaluation and algorithms, the taxonomy for wireless sensor network localization systems are also described in the thesis. The principles and characteristics of recent representative distributed localization algorithms including DV-hop, Euclidean are also discussed, presented and compared on a single simulation platform. Then, as to the shortage of present Three-dimensional localization algorithm, this thesis established a vector space model based on the number of the anchor nodes from the communication range of unknown node and presented a Novel Three-dimensional Localization Scheme in Wireless Sensor Network, and then described the algorithm principle and realization in MATLAB simulation environment. The simulation results demonstrate that the algorithm is of great advantages in improving location accuracy, radius of communication and density of anchor nodes which have little effect on position error.Main innovation points of the thesis are as follows:Firstly, study the principles and characteristics of related localization algorithm principle of WSN, analyze the shortage of present localization algorithm and compare them. Applying the mobile agent technology into the Three-dimensional localization algorithm to count the minimal hops of anchor node so reduce network data flux. Secondly, Introduce the improved DV-Hop localization algorithm into three-dimensional space and establish a vector space model to estimate the number of the unknow nodes and compute the initialization location value repeatedly to reduce the location error. Then a novel three-dimensional localization Scheme in wireless sensor network is proposed.