本文選題：礦井巷道 + 電波傳播　； 參考：《西安科技大學(xué)》2015年碩士論文

【摘要】：煤炭在我國(guó)的經(jīng)濟(jì)發(fā)展中扮演著重要的角色,在一定時(shí)期內(nèi)還無(wú)法被替代。煤礦開采過(guò)程中,通信系統(tǒng)為井下人員安全、提高生產(chǎn)效率以及生產(chǎn)過(guò)程優(yōu)化提供重要保障。然而由于礦井巷道是一個(gè)特殊的受限空間,井下環(huán)境復(fù)雜多變,電磁波不能很好的傳播,導(dǎo)致井下無(wú)線通信系統(tǒng)的發(fā)展相對(duì)較慢。本課題通過(guò)對(duì)井下電波傳播特性分析研究,采用支持向量機(jī)建立礦井巷道無(wú)線信道模型,對(duì)井下無(wú)線通信系統(tǒng)的研究設(shè)計(jì)提供理論和實(shí)際意義。本文在對(duì)支持向量機(jī)、礦井巷道電磁波傳播特性分析研究的基礎(chǔ)上,以矩形巷道為對(duì)象,重點(diǎn)分析研究天線極化方式、載波頻率、巷道圍巖電參數(shù)、橫截面尺寸、巷道壁粗糙程度、巷道壁傾斜、收發(fā)天線間距離等變化對(duì)電磁波的傳輸衰減的影響。針對(duì)大尺度衰落將上述影響因素作為支持向量機(jī)網(wǎng)絡(luò)模型的輸入,把電磁波的傳輸衰減作為模型的輸出,以此訓(xùn)練支持向量機(jī)網(wǎng)絡(luò)大尺度模型。在可行性分析階段,實(shí)驗(yàn)數(shù)據(jù)通過(guò)計(jì)算機(jī)仿真獲得,仿真模型選用了包括模式衰減、巷道壁粗糙度衰減和巷道傾斜衰減以及多徑瑞利衰落在內(nèi)的電波損耗疊加模型。針對(duì)于小尺度衰落信道,本文著重研究基于支持向量機(jī)算法的多徑衰落信道預(yù)測(cè)模型,利用相空間重構(gòu)理論對(duì)衰落信道的變化序列進(jìn)行重構(gòu),并利用重構(gòu)后的數(shù)據(jù)訓(xùn)練支持向量機(jī)信道衰落預(yù)測(cè)模型。文中支持向量機(jī)模型的核參數(shù)選擇選用多層動(dòng)態(tài)自適應(yīng)優(yōu)化算法。通過(guò)MATLAB仿真實(shí)驗(yàn),基于支持向量機(jī)的礦井信道模型可以很好的學(xué)習(xí)巷道無(wú)線信道的變化,與其他傳統(tǒng)模型比較,支持向量機(jī)信道模型的預(yù)測(cè)精度更高。實(shí)驗(yàn)結(jié)果證明,利用支持向量機(jī)技術(shù)建立井下電波傳播模型是一個(gè)可行的途徑。
[Abstract]:Coal plays an important role in China's economic development and can not be replaced in a certain period. In the process of coal mining, communication system provides an important guarantee for the safety of underground personnel, the improvement of production efficiency and the optimization of production process. However, due to mine roadway is a special restricted space, the underground environment is complex and changeable, electromagnetic wave can not spread well, resulting in the development of underground wireless communication system is relatively slow. In this paper, the radio channel model of mine roadway is established by using support vector machine, which provides theoretical and practical significance for the research and design of underground radio communication system. Based on the analysis of electromagnetic wave propagation characteristics of support vector machine and mine roadway, this paper focuses on the antenna polarization mode, carrier frequency, roadway surrounding rock electrical parameter, cross section size, taking rectangular roadway as the object. The influence of the roughness of tunnel wall, the inclination of tunnel wall and the distance between transmitters and transmitters on the attenuation of electromagnetic wave transmission. For large-scale fading, the above factors are taken as the input of the support vector machine network model, and the transmission attenuation of the electromagnetic wave is taken as the output of the model to train the large-scale support vector machine network model. In the stage of feasibility analysis, the experimental data are obtained by computer simulation, and the superposition model of radio wave loss including mode attenuation, roadway wall roughness attenuation, roadway slope attenuation and multipath Rayleigh fading is selected. For small scale fading channels, this paper focuses on the prediction model of multipath fading channels based on support vector machine (SVM) algorithm, and uses the theory of phase space reconstruction to reconstruct the variation sequences of fading channels. The reconstructed data is used to train the support vector machine channel fading prediction model. In this paper, the kernel parameter selection of support vector machine model is based on multi-layer dynamic adaptive optimization algorithm. Through MATLAB simulation experiment, the mine channel model based on support vector machine can learn the change of wireless channel of roadway well. Compared with other traditional models, the prediction accuracy of support vector machine channel model is higher. The experimental results show that it is a feasible way to establish downhole radio wave propagation model by using support vector machine (SVM) technology.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD655;TP18

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