Electromagnetic Wave Attenuation Mechanism and Distribution Strategy for Coal Mine Rescue Robot Under the Typical Obstacle Environment

After a coal mine disaster, the coal mine roadway often forms an unknown nonstructural environment. Once the normal communication of the roadway is destroyed, the rescue operation of the coal mine rescue robot could be hindered. To restore the emergency wireless communication system in the unstructured environment of the coal mine thus becomes an important prerequisite for the rescue work for the coal mine rescue robot. This paper studies the characteristics of the nonstructural environment and sets up its model. Based on the Maxwell equation and the mechanism of radio electromagnetic wave propagation, this paper researches the electromagnetic characteristics of wireless communication channel in the unstructured environment, and verifies them by numerical simulation. This paper also studies the strategy of repeater's laying for the robot, thereby providing a reliably theoretical foundation to quickly start up the emergency wireless of the coal mine rescue robot. Key Points The influence of a typical roadway obstacle environment on wireless electromagnetic transmission characteristics is studied The relationship between the characteristic parameters of the obstacle environment and wireless electromagnetic attenuation is discussed