Abstract
This study investigates the mechanism of channel wave multipath propagation to determine features of a channel wave in a coal seam. For this purpose, deduction formulas were used for different time delays and propagation paths and, subsequently, a multipath fading channel wave pattern was built. MATLAB software was used to simulate the model. To this end, the characteristics of the coal seam and the surrounding rock were considered. The simulation results were compared with results obtained from the model contained in COMSOL software to verify the accuracy of the model. According to the results obtained from the simulation, the proposed model shows a good match with the COMSOL model, which is a common simulation comparison standard. In addition, the channel wave energy approximates to exponential decay at a constant distance from the source, and the multipath propagation considerably affects its energy attenuation. Furthermore, the multipath reflections’ travel time derivation is accomplished properly in the coal seam.
Highlights
When using an elastic wave to probe a coal seam, a specific elastic wave is connected to the coal seam using a transmitter [1, 2]
Is paper is divided into four parts. is first part discusses the role and characteristics of elastic waves and the research status of multipath effects on elastic waves propagating in a formation. e second part discusses the mechanism of elastic wave multipath propagation, the path difference of multipath propagation and time delay, and the energy attenuation of multipath signals
It is assumed that the coal seam includes Z paths, and N denotes the number of received signals
Summary
When using an elastic wave to probe a coal seam, a specific elastic wave is connected to the coal seam using a transmitter [1, 2]. Hao et al obtained a multipath channel model for elastic wave signal propagation in a homogeneous medium by analyzing the attenuation characteristics of elastic waves propagating in parallel layers [17]. E main contribution of this paper is to try to explore the signal fading problem in the fine detection of coal channel transmission trough wave. Mathematical Problems in Engineering wave receiving method of formation propagation It provides a new method for detecting stratum structure during coal mining, which is of great significance for coal seam exploration. Is first part discusses the role and characteristics of elastic waves and the research status of multipath effects on elastic waves propagating in a formation. In the third part, based on the established multipath propagation model of elastic waves in a coal seam, the propagation of elastic waves in a coal seam is simulated.
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