Research On WSN Localization Technology And The Application In Mine Personnel Positioning

The nature condition of underground coal mine is complicated that potential security risk exists. Recently in our country, coal mine accidents occurred frequently; resulting in heavy casualties and economic losses, the existing coal mine safety monitoring system has been unable to meet the needs of coal mine safety production. Wireless sensor network is the set of wireless communications, data collection and in formation processing function of the new type of self-organization of distributed data acquisition network, with a unified technical standards and low-cost, Low-power characteristics, and so on. Applying WSN technology to coal mine safety monitoring will effectively increase the production of coal mine safety supervision and management.Localization technology is a key technology in WSN. In its application, the information monitored by the node is meaningless if the node localization is unknown. To define the node localization is a fundamental issue to locate the coal miners. This article studies the mechanism of WSN localization technology, the performance of localization algorithm and etc in a systematical way, key to research WSN localization algorithm in the application of coal mine. According to environmental characteristics of coal mine, the corresponding algorithm named dual-radius localization algorithm and the ladder-type nodes layout scheme suited for algorithm implementation and coal mine are proposed.Major work is divided into the following sections:(1) The research on the localization technology and its applicability, the paper studies the theory and feature of algorithm in WSN and researches from point of view on t algorithm accuracy, density of beacon node, hardware requirement and node layout requirement, then concludes the application of typical algorithm.(2) The research on algorithm adapted undermining: The paper chooses the better algorithm which is suitable for applying in undermining environment with combining the special undermining environment with algorithm characteristic, and then analyzes the defect of algorithms. We optimize the algorithm based on the above researches, thus propose the double-radius algorithm which could increase the accuracy of algorithm and extend the application area of algorithm. Then we simulate the algorithm and prove its property, simulation results show that the algorithm error has been reduced effectively from 10.51% to 3.62%, but without additional anchor and hardware.(3) The research on node layout: according to special environment of undermining and the characteristics of double-radius algorithm, the paper proposes a node layout scheme, which could increase the localization accuracy effectively, acquires monitoring information and the number of control node, and realizes the combination of the beacon node and unknown node with undermining environment.