| Along with our country society development,The society has an increasing demand for primary energy, coal. Coal industry has experienced a rapid development in our country. However, coal mine under the surface, the lane is filled with much harmful gas and carbon monoxide, special geographical environment and are more likely to collapse, high temperature and high pressure in carbon monoxide and other risk factors such as flammable gas explosion. Therefore, how to efficiently rescue miners in the pit is very important. For emergencies, to improve the rescue efficiency, the coal mine company now commonly use positioning technology underground in coal mine. Positioning technology based on WIFI is a common one.Analyzing positioning technology underground in coal mine at home and abroad at the first of this thesis.Then compare various communication technologies and determine use WIFI communication technology in this thesis.Comparison various positioning technologies, then adopt positioning technology based on distance measuring and establish distance measuring applicable for coal mine.Proposition an improved data filtering method based on Gaussian filter to manipulate data received from mobile node.In consideration of the lack of three edge location algorithm, propose a new positioning technology which is based on three edge location algorithm.Optimization positioning algorithm from filter and location algorithm,then carry on simulation experiment to make sure location algorithm is reliable.Communication in coal mine combine wire link with wireless link, wire link use fibre-optical to transmit data.In this thesis,there is choosing hardware and designing mobile node and confirmed node for location algorithm in the mine.Analyzing the need of location algorithm,designing wireless link node AP and feed circuit of datum node.At the last of this paper is the designing of software and chose corridor as test site to verify reliability of location algorithm system in this thesis. |
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