Research on Electromagnetic Wave Through-The-Earth Wireless Communication for Coal Mine Disaster

2011 ◽  
pp. 1-10 ◽  
Author(s):  
Jinyi Tao
Keyword(s):  
Electromagnetic Wave ◽  
Wireless Communication ◽  
Coal Mine ◽  
The Earth

A DISCUSSION OF THE “FAULT” AND “DIKE” PROBLEMS IN MAGNETOTELLURIC THEORY

Geophysics ◽  
1963 ◽  
Vol 28 (3) ◽  
pp. 487-490 ◽  
Author(s):  
J. T. Weaver
Keyword(s):  
Boundary Condition ◽  
Electromagnetic Wave ◽  
Current Density ◽  
Normal Component ◽  
The Earth ◽  
Source Field ◽  
Vertical Fault ◽  
Explicit Mention

In two recent papers appearing in Geophysics, d’Erceville and Kunetz (1962) and Rankin (1962) have dealt with the magnetotelluric theory for a plane earth which contains a certain type of vertical fault. In both cases the results depend on a boundary condition which requires the assumption that the normal component of current density vanishes at the surface of the earth. While d’Erceville and Kunetz confine their attention to the region below the surface and thereby avoid explicit mention of the source field, Rankin follows Cagniard (1953) by considering a plane‐polarized electromagnetic wave normally incident on the surface of the earth. In this case, the assumed boundary condition is not correct, as we shall see later; indeed, it actually leads to a contradiction.

Electromagnetic wave propagation and inequalities for moments of chord lengths

2004 ◽  
Vol 36 (04) ◽  
pp. 987-995 ◽  
Author(s):  
Jan Hansen ◽  
Matthias Reitzner
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Wireless Communication ◽  
Uniform Distribution ◽  
Surface Area ◽  
Convex Domain ◽  
Communication Systems ◽  
Electromagnetic Wave Propagation ◽  
Wireless Communication Systems ◽  
Received Power

In a convex domain K in ℝ d , a transmitter and a receiver are placed at random according to the uniform distribution. The statistics of the power received by the receiver is an important quantity for the design of wireless communication systems. Bounds for the moments of the received power are given, which depend only on the volume and the surface area of the convex domain.

Impact of Rough Wall Surface on Electromagnetic Wave Propagation Characteristics in Mine Tunnels

2011 ◽  
Vol 301-303 ◽  
pp. 1417-1421
Author(s):  
Shan Hua Yao ◽  
Xian Liang Wu
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Coal Mine ◽  
Electromagnetic Waves ◽  
Electromagnetic Wave Propagation ◽  
Rough Wall ◽  
Wall Surface ◽  
Propagation Characteristics ◽  
Waves Propagation ◽  
Mine Tunnels

In this paper ,the mine tunnels is regard as wave-guide which contains kinds of un-beneficial medium, we have study the formulas of electromagnetic waves propagation attenuation and roughness attenuation, the relations between propagation attenuation and roughness and frequency were simulated. The results show that the influence of propagation attenuation in lower frequency is more obvious, and roughness attenuation is increased rapidly as roughness of coal mine tunnels increasing. But tilted attenuation is stronger than roughness attenuation as propagation frequency increasing.

Design and Simulation of the Avalanche Transistor Pulse Generator

2013 ◽  
Vol 760-762 ◽  
pp. 92-95
Author(s):  
Tai Hua Wang ◽  
Yan Ming Zhang
Keyword(s):  
Wireless Communication ◽  
Communication Technology ◽  
Coal Mine ◽  
Pulse Generator ◽  
Pulse Amplitude ◽  
Ultra Wideband ◽  
Wave Form ◽  
Safe Level ◽  
Pulse Transmission ◽  
Wideband Wireless Communication

Ultra-wideband wireless communication technology is brought, in the coal mine communications in this paper in order to raising the safe level of communication in coal mine. Ultra-wideband wireless communication is a system which is transmitted by the extremely narrow pulse transmission. An avalanche transistor is the core of extremely narrow pulse circuit. Narrow pulse wave form can be simulated by multisim software. Acquiring the results of simulation is the extremely narrow pulse whose pulse amplitude ranging from 10 v to dozens v and pulse width is about 3 seconds. In addition to this circuit carries on the theoretical analysis, the results is quite consistent with the simulation value in this paper.

Design and Simulation of Wireless Communication System Channel in Coal Mine Based on OFDM Technology

2014 ◽  
Vol 989-994 ◽  
pp. 3823-3826
Author(s):  
Rong Hua Ma
Keyword(s):  
Wireless Communication ◽  
Mobile Communication ◽  
Coal Mine ◽  
Communication System ◽  
Channel Model ◽  
Transmission Rate ◽  
Mobile Communication System ◽  
Underground Coal Mine ◽  
Underground Channel ◽  
Wireless Communication System

The OFDM technology is applied in the mobile communication system of underground coal mine, the wireless communication system channel of underground coal mine is researched. The underground channel model is established, and the simulation is taken for testing the performance of system. The simulation results show that the OFDM technology can be applied in the mobile communication system in underground coal mine, and the transmission rate of the system and the ability of anti-interference are improved.

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