Research On Perception Layer Of Coal Mine Information Physics System

In order to realize active,comprehensive,and reliable perception in coal mines,this paper applies the information physics system to the underground of the coal mine,and constructs the architecture of the information and physical system of the coal mine.Several aspects have studied its perception layer.Aiming at the shortcomings of traditional coal mine underground personnel positioning algorithm,such as low positioning accuracy and large consumption of anchor nodes,this paper proposes an iterative weighted centroid positioning algorithm based on RSSI.The algorithm combines the RSSI ranging algorithm and the iterative centroid algorithm.First,a threshold is set to determine the node type,and then the error is reduced by different weight coefficients during the iteration process,and the error is corrected.Simulation results show that the algorithm is not only simple to calculate but also has small positioning error,which improves the positioning accuracy.Aiming at the huge amount of transmission and calculation of perceptual data in coal mines,this paper uses distributed compressed sensing algorithm to process it.Firstly,the spatial correlation of the perception nodes in the coal mine is analyzed,then the perception data is sparsely transformed,and the corresponding joint sparse model is established.Finally,a threshold sparsity adaptive matching tracking algorithm is proposed to reconstruct the signal.The innovation of this algorithm is mainly the preprocessing before the algorithm iteration,that is,selecting reliable atoms and deleting unreliable atoms by setting thresholds.Simulation results show that the reconstruction algorithm not only has high reconstruction accuracy,but also reduces complexity.Based on the above research,this paper establishes a coal mine underground perception system composed of perception nodes,cluster head nodes,convergence nodes and mobile nodes.The sensing node is mainly composed of the main control chip STM32,various types of sensors and the wireless transmission module LoRa.Its main function is to collect and transmit the sensing data in the coal mine.The cluster head node is mainly composed of the main control chip and the wireless transmission module.The data transmitted by the sensing nodes in the area is copied,amplified and forwarded;the aggregation node is mainly composed of the main control chip,the wireless transmission module and the Ethernet access module,receives the cluster head node information,and then transmits it to the monitoring center through the Ethernet communication network.The mobile node is installed on the safety helmet of downhole personnel.It not only collects and transmits data on the downhole environment and blood oxygen content in downhole personnel,but also the most important thing is to locate the personnel in order to grasp the status and distribution of downhole personnel in time.Finally,a simulation experiment was conducted to test the LoRa communication network test and the positioning accuracy of the mobile node.The results show that the system has good network communication capability,low packet loss rate,and small positioning error of the mobile node,and accurate positioning.Figure[54]table[10]reference[82]...