Research On Mobile Wireless Sensor Network Location Algorithm Based On Directional Antenna

With the development of sensor technology,embedded technology and wireless communication technology,wireless sensor networks have been more and more used in disaster monitoring,medical diagnosis and military technology.This paper mainly studies the positioning algorithm of mobile wireless sensor network based on directional antenna.The main work of this paper is as follows:This paper describes the basic theory of wireless sensor networks,the commonly used node calculation method and the performance evaluation standard of positioning algorithm.The mobile wireless sensor network localization algorithm is summarized and summarized,and the reason of algorithm error is analyzed.The moving path planning of the moving anchor nodes will affect the positioning accuracy to a certain extent.Therefore,the node mobility model and several static path planning algorithms include: Scan,Double Scan and Hilbert models.And the advantages and disadvantages of various models are studied.In order to ensure the fairness of the algorithm,a kind of mobile path planning is proposed in the simulation experiment to ensure that the path planning does not affect the positioning er ror of the contrast algorithm.The influence of different antenna types on the positioning error is studied.The omni-directional antenna and the directional antenna algorithm are analyzed respectively,and the factors influencing the localization error of the algorithm are summarized.The Ssu algorithm is used to analyze the influence of environmental factors on the positioning algorithm of the omni-directional antenna.The Ssu algorithm uses the chord on the communication circle to complete the positioning.The irregular environment will affect the end of the string,thus affecting the positioning accuracy.The advantages and disadvantages of using the directional antenna localization algorithm are studied and summarized.The principle of the BLI(the Border Line Intersection)algorithm and the cause of the positioning error are analyzed.The intersection of the directional antenna boundary is used to replace the whole intersection region,and the positioning error is large.In the mobile wireless sensor network positioning,due to omni-directional antenna signal susceptible to environmental impact caused by large positioning error.In reality,the width of the main lobe of the alignment antenna is between 60 degrees and 120 degrees,and the orientation of the directional antenna is larger.In this paper,an improved mobile wireless sensor network location algorithm(DADLP,Directional Antenna in Different Level of Power)based on directional antenna is proposed.A mobile anchor node with a single directional antenna is used to periodically broadcast the auxiliary location information.After receiving the positioning signal,the unknown node receives the positioning signal according to the received power Divided into several levels,further narrowing the positioning estimation area.In order to verify the performance of DADLP algorithm,the simulation experiments of DADLP,Ssu,Abdi,BLI,GGDI(the Greatest Gain Direction line Intersection)and RROI(Radiate Region Of Intersection)mobile anchor nodes are carried out in this paper.The simulation results show that the DADLP algorithm is different between the Scan Path model and the DADLP algorithm.The positioning accuracy of the path model is significantly higher than that of the other four algorithms,and there i s a lower average positioning error under the rule and the irregular model.