發(fā)布時(shí)間：2018-11-12 18:24

【摘要】：隧道是一種特殊的受限空間,一般具有復(fù)雜結(jié)構(gòu)和介質(zhì)參數(shù),無(wú)線信號(hào)傳播會(huì)受到隧道的截面形狀、尺寸、圍巖材料電參數(shù)、電波工作頻率等因素的影響,其無(wú)線電信道完全不同于地面無(wú)線電信道,無(wú)法照搬地面上的有關(guān)理論。因此,開展隧道等受限空間內(nèi)無(wú)線電波傳播特性FDTD分析方法研究,搞清隧道截面形狀、尺寸、圍巖電磁參數(shù)、電波工作頻率等對(duì)電波傳播特性的影響,不僅可以拓展隧道內(nèi)電波傳播特性分析的途徑,拓寬FDTD方法的應(yīng)用范圍,研究成果還可以進(jìn)一步推廣到相關(guān)受限空間內(nèi)電磁問(wèn)題的數(shù)值分析,而且對(duì)完善隧道中無(wú)線傳輸理論、指導(dǎo)隧道移動(dòng)通信系統(tǒng)建設(shè)、交通運(yùn)輸安全、煤礦以及礦山救護(hù)等工作具有十分重要的理論意義和使用價(jià)值。本文主要工作有:1.研究了波導(dǎo)端口激勵(lì)源加入方法,通過(guò)算例驗(yàn)證了該方法良好的波形保真性和普遍性;2.研究了截面為圓形、矩形和拱形隧道中各主波模衰減率,分析了隧道截面尺寸、形狀、電波工作頻率、相對(duì)介電常數(shù)對(duì)衰減率的影響;3.研究了Compact-2D-FDTD算法,并用實(shí)變量Compact-2D-FDTD算法分析了截面為圓形、矩形和拱形隧道中電波傳播特性,通過(guò)與解析法對(duì)比,驗(yàn)證了該方法的有效性;4.研究了基于MPI-Open MP混合平臺(tái)的并行技術(shù),實(shí)現(xiàn)了基于MPIOpen MP混合平臺(tái)的隧道中電波傳播特性分析三維并行FDTD算法,證明了該方法的正確性和有效性。
[Abstract]:Tunnel is a special limited space, which has complex structure and medium parameters. Wireless signal propagation will be affected by the tunnel cross-section shape, size, surrounding rock material electrical parameters, radio frequency and other factors. The radio channel is completely different from the terrestrial radio channel, and can not copy the related theories on the ground. Therefore, in order to find out the influence of tunnel cross section shape, size, surrounding rock electromagnetic parameters, radio frequency and so on, the FDTD analysis method of radio wave propagation characteristics in confined space, such as tunnel, is carried out to find out the influence of tunnel section shape, size, surrounding rock electromagnetic parameters, radio wave frequency, etc. It can not only expand the way of analyzing the propagation characteristics of radio waves in tunnels, widen the application of FDTD method, but also extend the research results to the numerical analysis of electromagnetic problems in related restricted spaces, and improve the theory of wireless transmission in tunnels. Guiding the construction of tunnel mobile communication system, transportation safety, coal mine and mine rescue work has very important theoretical significance and use value. The main work of this paper is as follows: 1. The method of adding waveguide port excitation source is studied, and the good waveform fidelity and universality of the method are verified by an example. 2. The attenuation rates of main wave modes in circular rectangular and arched tunnels are studied. The effects of tunnel cross section size shape frequency of radio wave and relative dielectric constant on attenuation rate are analyzed. 3. The Compact-2D-FDTD algorithm is studied, and the propagation characteristics of radio waves in circular, rectangular and arched tunnels are analyzed by using the real variable Compact-2D-FDTD algorithm. The validity of the method is verified by comparison with the analytical method. 4. The parallel technology based on MPI-Open MP hybrid platform is studied and the 3D parallel FDTD algorithm based on MPIOpen MP hybrid platform is implemented to analyze the propagation characteristics of radio waves in tunnels. The correctness and effectiveness of the method are proved.
【學(xué)位授予單位】：延安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN011

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