井下有限空間2.4ghz無線信號測試及傳播規(guī)律的研究

1、 論文題目：井下有限空間 2.4GHz 無線信號測試及傳播規(guī)律的研究 專 業(yè)：信號與信息處理 碩 士 生：倪翔 （簽 名) 指導(dǎo)教師：李國民 孫 弋 （簽 名) 摘 要 隨著無線通信技術(shù)應(yīng)用日益成熟，2.4GHz 頻段下無線通信技術(shù)在有限空間中得到應(yīng)用。由于煤礦井下有限空間無

2、線信號傳播環(huán)境惡劣，無線信號覆蓋困難，研究井下無線信號傳播規(guī)律對于 2.4GHz 頻段無線通信系統(tǒng)在井下構(gòu)建具有重要指導(dǎo)意義。 本文針對國內(nèi)外基于有限空間無線信號覆蓋測量系統(tǒng)發(fā)展現(xiàn)狀的分析， 利用波導(dǎo)模式匹配法和幾何光學(xué)法的電磁波無線傳播特性理論研究井下有限空間 2.4GHz 無線信號傳播規(guī)律，提出了有限空間 2.4GHz 無線信號覆蓋測量設(shè)計方案，該方案采用精密電壓控制的壓控振蕩器作為點頻信號源、以基于 USB 總線的便攜式功率計作為

3、無線信號強(qiáng)度測量設(shè)備，完成了對有限空間 2.4GHz 無線信號的測試系統(tǒng)的組建，并對煤礦井下副平洞、運輸槽以及無人工作面等不同巷道進(jìn)行測試，得到了煤礦井下不同巷道 2.4GHz無線信號強(qiáng)度數(shù)據(jù)。 本文選用自由空間傳播模型作為基礎(chǔ)，結(jié)合井下巷道的特殊環(huán)境，通過利用波導(dǎo)模式匹配法和幾何光學(xué)法的電磁波無線傳輸特性研究方法建立井下無線傳輸信道模型， 以Matlab 對樣本數(shù)據(jù)擬合分析研究 2.4GHz 無線信號在煤礦井下有限空間傳播特性，在距離

4、點源 30m 處信號強(qiáng)度呈下降趨勢， 在 30-120m 處無線信號強(qiáng)度在 30dB 范圍內(nèi)波動變化。 由波導(dǎo)模式法和幾何光學(xué)法所得到的無線電波在井下有限空間的傳播規(guī)律與實際測量數(shù)據(jù)有較大的差異，從而為礦井有限空間無線網(wǎng)絡(luò)覆蓋提供了理論參考。 關(guān) 鍵 詞：有限空間；無線信號；數(shù)據(jù)擬合；網(wǎng)絡(luò)覆蓋 研究類型：理論研究 Subject : Testing and Research of 2.4GHz Wireless Signal Pro

5、pagation in Underground Mine Confined Space Specialty : Signal and Information Process Name : Ni Xiang (Signature) Instructor : Li guomin Sun Yi (Signa

6、ture) ABSTRACT With development of wireless communication technology, the 2.4GHz has been applied in the confined spaces .Due to the severe environment for wireless signal in confined spaces ,and difficulty

7、 to cover 2.4GHz signal, it has significant meaning to research wireless propagation in order to construct 2.4GHz wireless communication system in mine. Base on current situation of the wireless signal coverage measureme

8、nt system, we study the mathematical laws of strength and distance of confined spaces wireless signal through using waveguide-mode theory and wireless transmission characteristic of electromagnetic theory of geometrical-

9、optics theory .then propose the design of confined spaces 2.4GHz coverage measurement. we adopt a very precisive voltage-controlled oscillator as frequency signal source, a USB bus based portable power meter as the wirel

10、ess signal strength measurement equipment. complete the construction of testing system for confined spaces of 2.4 GHz wireless signal. we get the strength data from different roadway in mine after testing vice flat hole

11、of underground coal mine, transport pan and unmanned workplace at different roadway. Base on free space propagation model as the , this paper combined with the special environment of underground , through use of wavegui

12、de mode theory and geometrical- optical theory of characteristics of electromagnetic wireless transmission to establish underground wireless transmission channel model. We analyze sample data and study the 2.4GHz signal

13、propagation characteristics in coal mine and confined spaces through MATLAB. At 30m from the point source ,the signal strength is decline, at 30-120m wireless signal strength fluctuates within 30 db, it has big differenc