Study On Localization Technology In Wireless Sensor Network

Recent years, with the rapid development of Micro-Electro-Mechanical Systems, the wireless communication technology, the sensor technology and the integrated circuit technology, the wireless sensor network has already become one of leading edge hot spot research directions. Apply the wireless sensor network positioning technology in underground monitoring system. Through the sensor node collaborative sensation, collection and processing, realizing to the network coverage of the region event's detection, the identification, the localization and the track, which can enhance improve the performance of the underground monitoring system, moreover, the detection system can run to continue after the accident, provide information for search and rescue work.Based on wireless sensor network positioning technology research, combining the characteristics of underground positioning environment this paper take wireless sensor networks without ranging positioning technology as a research direction to research wireless sensor network the node from the localization method. (1) For the static node localization aspect, the paper has studied based on the localization mechanism, which focuses on studying the DV-Hop node localization algorithm, the proposed algorithm through a few anchor nodes that most dynamic refresh backlog a node implementation positioning. Through the analysis of the DV-Hop algorithm mid-range estimation errors, poor location accuracy insufficient, combining the underground monitoring network topology non-regularity characteristics, The paper on the rules of node during localization algorithm is estimated and the distance between the two stages positioning output the optimization, putting forward the new plan named by DV-HopZ of node localization algorithm based on DV-Hop .(2) For dynamic node localization aspects, in view of the anchor node dynamic refresh method , showing bad real-time, precision and high energy consumption, the paper studies the Monte Carol's mobile location algorithm. In order to enhance the actual utility of the algorithm, the paper making the improvement and the optimization in the process to forecast and filtrate the core links, and in the introduction of predictive interpolation theory, proposing one kind based on the dynamic node partial sampling, the real-time output new plan: MCLZ; (3) for the static node and the dynamic node from the localization method study's foundation, using the MATLAB simulation tool, designed and realized two kind of plan node localization prototype systems based on DV-HopZ and the MCLZ. The prototype system can demonstrate the localization performance of two kinds of plans, in the network the node location state and the node connective situation.Simulation experiments show that the paper for static nodes and dynamic node positioning of the new plan, which can satisfy the need of underground monitoring system, with good location positioning accuracy, few positioning energy consumption and strong network applicability.