Research On Accurate Positioning System Of Underground Personnel In Coal Mine Based On UWB Technology

The development direction of modern intelligent mines is "safe,efficient,intelligent and clean".Personnel to achieve precise positioning technology is one of the core technology of coal mine production safety.At present,underground positioning systems mostly use Wi-Fi,Zig Bee and other methods,which are difficult to meet the demand for accurate positioning of underground personnel for safe production in coal mines.In recent years,high-precision Ultra-Wide-Band technology has not been widely used in underground coal mine personnel positioning systems.This article focuses on the application of UWB technology in coal mine personnel precise positioning systems to improve the positioning accuracy of underground personnel positioning systems.It is of great significance to coal mine safety production management and emergency rescue.The main research contents of this paper are as follows :(1)According to the research and analysis of the underground coal mine roadway environment and the current underground personnel positioning technology,the advantages of UWB technology in underground personnel positioning are summarized,and the positioning algorithms are analyzed and compared on this basis.The TOA ranging algorithm of SDS-TWR is selected in combination with the error analysis in the special environment,which effectively suppresses clock synchronization problems and frequency deviation errors(2)Aiming at the problem of measurement error caused by UWB signal propagation in underground Non-Line-of-Sight,an adaptive and improved Kalman filter algorithm is proposed to suppress NLOS error and achieve the purpose of improving ranging accuracy.On the basis of the ranging algorithm,this paper proposes an accurate positioning algorithm for underground personnel based on Taylor ' s weighted least squares method and Kalman filter.,which reduces the positioning error and analyzes the precise positioning coordinates.(3)In view of the difficulty in the layout of underground mine tunnel base stations,the positioning performance index was studied,and the influence of the geometric dilution of precision(GDOP)based on the TOA positioning system base station layout on the positioning accuracy was analyzed.From the GDOP average value of the three influencing factors of the number of base stations,geometric configuration and base station height in a typical layout,the best strategy for a typical base station layout is obtained.Aiming at the problem that the base station cannot be deployed in the optimal position of the typical layout,an adaptive optimization algorithm based on genetic is proposed to solve the optimal base station layout position under constraint conditions.(4)Taking Yong Mei Group's Ju Ji Coal Mine Underground Monitoring System as the background.Combining UWB technology to design the structure of underground personnel positioning system in coal mines,and test the function of mobile terminal system and personnel positioning accuracy,to achieve the requirements of the personnel precise positioning system.There are 57 figures,9 tables and 82 references in this paper.