Research Of Emergency Wireless Channel In Through Mine Based On TLM Method

Coal is the basic energy resource of our country, the safety production of coal enterprises is a key factor for the stable and rapid development of coal industry. To ensure the safe production of coal enterprises, strengthen the active defense measures at the same time, should also strengthen passive measures that the emergency rescue after the accident, emergency wireless communication through the earth is a stable and secure communication system used in coal mine safety production and disaster relief. Electrical parameters of mine geological strata determination, reduction of mine geological structure and strata in mine electromagnetic propagation characteristics of the transmission channel is to study the emergency through wireless communication of three important parts. In this paper, through the experimental study, analytical calculation and numerical simulation of the emergency response to the wireless communications in-depth analysis and research, the main research work is as follows:(1) Introduce the emergency through wireless communication research background and practical significance in coal mine accidents, elaborate the difficulties existing in technology and the development state of communication through in China and abroad, and in view of electromagnetic field numerical calculation method of the mine strata.(2)Using the method of experimental study expounds the characteristics of electrical parameters of the stratum. Detailed analysis of the structure of the mine strata, as well as the factors affecting the formation of the channel signal, and based on the electrical parameters of the mine strata, the simulation study of the attenuation characteristics of the channel.(3) Describes the general theory of electromagnetic wave propagation, based on the layered hierarchical structure of mine strata, use analytical calculation method to solve the reflection and transmission coefficients of the mine strata. Based on the mine strata established on the simplified model, analysis of uniform plane wave in the ideal space and mine strata on the interface of reflection and transmission phenomena.(4)By analogy with Maxwell electromagnetic equations and one-dimensional TLM algorithm, derived one-dimensional TLM algorithm calculation formula and the iteration formula, then extended to the two-dimensional space to prove it in the analysis of the feasibility of the 2-D electromagnetic field, and on the 2D TLM model analysis, derived 2-D TLM algorithm calculation formula and the iteration formula. Using two-dimensional TLM model algorithm to build model of the geological structure of the mine strata, change the electromagnetic field calculation of mine strata into circuit calculation of two-dimensional TLM model.(5)An electromagnetic field analysis system based on the TLM method for the simulation of wireless channel. Through the survey data, the electric parameters of each layer of the mine stratum are set, and the simulation structure of 2-D mine geology is drawn, and the electromagnetic field is solved by the algorithm of 2-D TLM model.First, the emergency through wireless communication were theoretical research, and on this basis, combined with actual situation of practical application of further study, the emergency through the research and application of wireless communication has certain theoretical and practical significance.