The Study Of Pivotal Localization Technology In Wireless Sensor Network

With the expansion of Wireless Sensor Network applicable field and the increased uncertainty in the real environment,the Localization Technology as a basic service and also a critical service,is undoubtedly facing more challenges.Due to the limited communication range of the nodes,the large fluctuation of the communication effect caused by the external environment,and nodes are randomly deployed,etc.The network deployment area usually has an irregular shape or there is a communication failure and the nodes are always distributed unevenly.According to the characteristics of Wireless Sensor Network,the paper carries out the following innovations in Localization Technology:First of all,in order to solve the co-linearity of virtual beacons and to ensure that the localization coverage rate makes the beacons move too long and increases energy consumption,the paper proposes a static path planning localization method based on unit area,the algorithm uses the mobile beacon to assist localization and the unit area adopts the type that is similar to the Z,the angle between the beacons is 60 degrees.What's more,the whole path approaches to Scan curve.To prevent excess path length,the connection between the unit areas needs to be as short as possible,some specific units may need the 180-degree turn,which effectively reduces energy consumption.In response to irregular deployment area,corresponding solutions have been proposed.Experiments show that this method has high localization coverage and accuracy.Besides that,it effectively reduces the beacon path length and maintains good stability in different nodes distribution environments.Secondly,due to the problems such as irregular network deployment areas in reality,large communication consumption and long path length,this paper proposes a dynamic path planning method based on dual beacons,the algorithm uses two beacons to obtain the unknown nodes information around them at the same time,which effectively expands the range of beacons to obtain information.The number of unknown nodes in each direction is one of the factors that can influence the decision and the moving step length in each direction is fixed,they both effectively reduce the computation and communication consumption.The helix structure's path trend assists to make direction decisions,so that the path can move as prone to deployment edges as possible,avoiding unnecessary path cost.The rollback mechanism moves to the nodes that have not received any beacon node information,effectively guaranteeing the localization coverage.Experiments show that the proposed algorithm has high localization coverage,good applicability and stability in different nodes distribution.It also reduces the mobile path length and the number of virtual beacon nodes.Besides that,the smaller communication radius can achieve better localization results.It effectively reduces energy consumption.