Adaptived Localization Algorithm Based On RSSI For Coal Mine In Wireless Sensor Networks

Coal is the main energy in our country, with the increasing demand of coal inrecent years, the rise of China’s coal mine accidents is Serious, Coal mine safetysituation is worrying, Coal mine safety has become an important link in production ofcoal mine. Influenced by the complex terrain in coal mines,Coal mine communicationhas strong electromagnetic interference, time and spatial characteristics significantlyand complexity of the network topology, etc.Coal mine real-time data can not becollected timely and accurate, lead to monitor security center Can’t implementEffective warning and disaster rescue work. And, with the increasing demand forindoor positioning applications, positioning technology complex and diverse, Againstthe analysis of the coal mine special environment,we Provide strong applicabilitysolutions to achieve real and effective coal mine personnel positioning, Not only havesome academic value, but also for coal mine safety production industry to ensure thesafety of life and property has great significance.This paper mainly studies the coal mine positioning system architecture,roadway environmental characteristics, the characteristics of the coal minecommunications, indoor positioning technology methods. The main research worksare as follows:(1) To analysis wireless signal propagation model effectively, Base on thetraditional log-normal distribution model, base on the node deployment andenvironmental characteristics of coal mine，according to dynamic calculation andselect RSSI ranging model of the path loss exponent, Improve the node rangingaccuracy, reduce the localization algorithm due to low precision ranging error;(2) To analysis the environmental characteristics of the coal mine,apply thetraditional RSSI trilateral algorithm to the coal mine node localization, then combinethe Straight line roadway and up and down curve roadway of the environment,thepositioned relations of the two beacon nodes and the node to be positioned Dividedfrom the outside, cut, intersect, containing, etc.Then establish coal mine roadway lossmodel and the corner wall loss model, Propose a SRTCL(self-adaptived RSSI trianglecentroid localization) algorithm, To improve the coal mine node location accuracy,andto solve the problem of under the real complex environment, the presence of randomerrors RSSI value, causing trilateral positioning method equation has no solution; (3) Because of the harsh environment, the sensor node energy is limited,vandalism and other problems in coal mine, When the node failure, making the signalcoverage of roadway inadequate,Traditional RSSI trilateral localization algorithm willnot apply, this paper according to the roadway structure and node movementtrends,according to the Newton interpolation theorems establish node function curveson time, direction and other parameters,through empirical model which established byfunction curve, Help achieve node localization algorithm when the coverage of signalis insufficient,help improving positioning accuracy,Simulation results show thatSRTCL compared with the traditional Coal mine localization algorithm on thepositioning accuracy has been effectively improved, can well meet the requirementsof accurate positioning the coal mine.And under harsh conditions such as partial nodefailure can still maintain good positioning accuracy, To ensure the validity of datacollection and mine safety has a solid foundation.