Research On Localization Algorithm Of Wireless Sensor Networks Under Earthquake Ruins Environment

Earthquake occurred continuously in China in recent years,which made significant losses for people and government.How to rapidly determine the location of buried person and effectively rescue works under complex environment,has become the most urgent tasks after the disaster occurred.In this context,localization algorithms of wireless sensor networks under earthquake ruins environment will be discussed in the paper,the main contents include the following aspects:First,it analyzes the applicability of the localization algorithm for wireless sensor networks,for the characteristics of the ruins,the paper highlights the basic idea and positioning mechanism of DV-Hop localization algorithm with a strong environmental adaptability.Modified DV-Hop localization algorithm based on compensation coefficients is proposed taking into account the undulating surface and the uneven distribution of nodes.Through the weighted average method to calculate the compensation coefficient,then uses the coefficient to correct the hop distance between unknown nodes and anchor node.Then,considering the algorithm accuracy is not high,the improved algorithm strategies and specific method is given by the means of reducing the cumulative error and optimal selection of anchor nodes: In the distance estimation stage,the number of hops are weighted according to the distance between neighbor nodes,thereby correcting the average hop distance;In the stage of position estimation,constraints of optimization anchor nodes are introduced to narrow the triangular area of unknown node surrounded by beacon nodes,then screening anchor nodes of participating coordinate calculation and making a substantial decrease of the unknown node coordinate error in the triangle area.Finally,the experimental verification is carried out by Matlab simulation platform.Simulation results show that,the positioning error volatility of modified algorithm is small and the positioning accuracy is improved by about 6m.when the ratio of anchor nodes is 10%,communication radius is 40 m.And the positioning error of the algorithm decreases with the increase of the density of the anchor nodes and the radius of the communication,the corresponding positioning accuracy and stability will be better.