Research And Implementation Of Underground Personnel Positioning Technology Based On WSN

Coal resources are an important strategic resource in our country.Due to the vast land and resources of our country,there are abundant coal resources to be exploited.However,most of our country's coal mines go deep underground,which brings many safety hazards to the mining work.Coal mine accidents have occurred frequently in the last few years,so the safety of coal mines production has attracted lots of people's attention.Building a reliable positioning system is an important part of ensuring the safe operation of underground workers.This thesis has done the following work for the research of underground personnel positioning technology and the realization of positioning system:(1)Research on location algorithm.The thesis aims at the characteristics of wireless sensor networks and considering the complexity of the downhole communication environment,this thesis finally selects the DV-Hop algorithm as the main research object after analyzing and comparing the existing downhole personnel positioning algorithms.(2)Improvement of DV-Hop algorithm.Due to the single communication radius of the original DV-Hop algorithm,the thesis propose a 3-communication radius model for anchor nodes to solve the problem that the hop distance between nodes cannot reflect the true distance.For the problem of error accumulation during distance selection,an improved hop distance selection method for unknown nodes is proposed,which reduces the accumulation of hop distance errors for unknown nodes when calculating positions.(3)Algorithm experiment verification.Two groups of simulation experiments are carried out in Matlab for the improved DV-Hop algorithm.The sensor nodes were distributed in a square area to compare the positioning performance of each algorithm in a general environment,and the sensor nodes were distributed in this article.Compare the positioning performance of each algorithm in the special underground environment in the designed "U" type roadway area.According to the experimental data,compared with the original algorithm,the improved algorithm in the thesis has great improvement,and also has a better positioning effect than the same type of algorithm.Subsequently,the improved algorithm was applied to practice for verification,and the results can basically meet the positioning requirements of downhole personnel.(4)System design.According to the production situation of the coal mine,a coal mine management system of the underground personnel positioning information based on web is designed and implemented.This system realizes the statistics of underground personnel position information and the query of position and attendance.