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The Research And System Implemetation Of Node Localization Algorithm In Wireless Sensor Nerwork

Posted on:2015-03-29Degree:MasterType:Thesis
Country:ChinaCandidate:G L ShaoFull Text:PDF
GTID:2298330422470796Subject:Measuring and Testing Technology and Instruments
Abstract/Summary:PDF Full Text Request
Wireless sensor network is a task-oriented ad-hoc network which is constituted by alarge number of distributed sensing nodes, low cost, low power consumption and manyother prominent advantages make it has very broad potential market. It mainly includesthe following basic questions: topology control, node localization and routing protocol,among them, the node localization mainly completes the real-time tracking andmonitoring for targets, which can be widely applied to the military, industry, agriculture,bio-medical and other fields, it has become a hot direction of current research. At present,the accident in factory and mine occur frequently, safety in production is alarming, usingWSN technology to locate working personnel will improve the monitoring andmanagement level effectively in safe production, therefore, the study of localizationalgorithm has great value and practical significance.In this paper, aim at the deficiencies of the existing positioning systems, I study thelocalization algorithm and scheme in depth, then propose improvement measures.Research the basic theory of positioning algorithm and analyze the shortage of theexisting technique, I provide optimization proposal for the RSSI ranging method, throughchoosing the most appropriate fitting curve and model in different range, reduce theranging error in the traditional model, and this can provide more accurate data for thenext localization algorithm.Make a deep studying for the multilateral positioning equation, for the normalequation, propose a new weighted centroid algorithm based on position error, through theweight show different influence of different datas to enhance the accuracy; for theill-posed problem, as the least-squares method will bring greater error, propose a kind ofoptimization localization algorithm based on Tikhonov regularization method, whenchoosing the appropriate regularization parameter, take L-curve criteria to improve theGeneralized Cross Validation method.Propose a ZigBee wireless location system which is suit for the real chemicalenvironment, design the hardware and software component of each node in positioning system. The simulation result shows that: compared with the previous algorithm, theimproved algorithm reduce the interference of environmental factors effectively and havebetter positioning accuracy.
Keywords/Search Tags:wireless sensor networks, localization, received signal strength indicator, centroid, Tikhonov regularization
PDF Full Text Request
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