Abstract
According to the characteristics of the underground coal mine roadway structure and disaster environment, this article proposes an underground emergency rescue communication system based on wireless mesh network and its corresponding environmental monitoring subsystem. We design the structures of the emergency rescue communication system and the wireless mesh nodes. The nodes are designed with intrinsic safety features. The work also develops wireless multi-parameter environmental monitoring terminals, and sets up the software platform for the environmental monitoring subsystem. The developed underground coal mine emergency rescue communication system based on wireless mesh network and environmental monitoring subsystem are tested both on the ground and in a real underground roadway environment. Experimental results from the testing show that the signal strength is -45 dBm on average, and the bandwidth attenuation of each hop is less than 10%, the transmission delay after the 11th hop is only 14 ms. The developed emergency rescue communication system is functionally stable, the environmental monitoring subsystem is capable of performing real-time monitoring of various underground environmental parameters, and achieves high accuracy in monitoring.
Highlights
Most mine accidents happen in underground coal mines
The main contributions are summarized as follows: 1. We propose an emergency rescue communication systems (ERCS) based on wireless mesh network (WMN)
Our experiments show that the signal strength between the backbone mesh nodes is 245 dBm on average, the bandwidth of the backbone network after the 11th hop is 13.1 Mbps, and the bandwidth attenuation of each hop is less than 10%, the transmission delay after the 11th hop is only 14 ms, the developed ERCS is functionally stable, and the environmental monitoring subsystem (EMS) is capable of performing real-time monitoring of various underground environmental parameters, and achieves high accuracy in monitoring
Summary
Most mine accidents happen in underground coal mines. Due to the complex geological conditions of underground coal mines, after an accident occurs, hazardous factors such as marsh gas, carbon monoxide, water, and fire coexist. Due to the inherent narrow bandwidth of Zigbee sensor network, it is difficult to simultaneously support a variety of data transmission with high quality and networking capacity This makes it unsuitable to be set up as the backbone of an underground emergency communication network. The EMS can perform real-time monitoring of the environmental status of underground disaster areas, providing scientific evidence needed for decision-making for both ground command and underground rescue This has the potential to greatly improve the work efficiency of coal mine emergency rescue operations, and avoid the occurrence of secondary accidents during the rescue process. Based on the type of variations in the underground wireless data terminals, as depicted, the WMN-based underground ERCS can be divided into three sections with respect to their functions: (a) the video surveillance subsystem, (b) the voice dispatching subsystem, and (c) the EMS.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
