本文選題：無線通信　切入點(diǎn)：井下巷道　出處：《煤炭學(xué)報》2017年10期

【摘要】：煤礦井巷中,如果天線的波束過寬,則難以有效抑制多徑衰落、增大覆蓋范圍;反之,如果波束過窄,則容易使巷道的邊緣區(qū)域得不到有效覆蓋。利用多波模波導(dǎo)理論,討論得出理想點(diǎn)源在巷道中的輻射場分布特性是制定礦用天線波束指標(biāo)的理論依據(jù)。在此基礎(chǔ)上,推導(dǎo)了井下理想點(diǎn)源的方向函數(shù)和半功率波瓣寬度。隨后,統(tǒng)計(jì)計(jì)算結(jié)合相關(guān)仿真,討論了巷道波導(dǎo)結(jié)構(gòu)、介質(zhì)壁電參數(shù)、載波頻率和電磁波傳播距離的影響。根據(jù)分析所得,結(jié)合相關(guān)推導(dǎo)與比較,給出了礦用天線的最佳波束指標(biāo):為明顯改善巷道內(nèi)的無線覆蓋效果,礦用天線應(yīng)輻射形狀較扁的均值為π/2的Gaussian波束;且天線的半功率波瓣寬度至少要窄于理想點(diǎn)源輻射場在巷道第I,II傳播區(qū)分界點(diǎn)處的波瓣寬度。
[Abstract]:If the beam of the antenna is too wide, it is difficult to restrain the multipath fading and increase the coverage effectively in the coal mine, whereas if the beam is too narrow, the edge area of the roadway can not be covered effectively.Based on the theory of multimode waveguide, it is discussed that the distribution of radiation field of ideal point source in roadway is the theoretical basis for determining the beam index of mine antenna.On this basis, the direction function and half power lobe width of the ideal point source are derived.Then, the effects of waveguide structure, dielectric wall parameters, carrier frequency and electromagnetic wave propagation distance are discussed.According to the analysis results, combined with correlation derivation and comparison, the best beam index of mine antenna is given: in order to improve the wireless coverage effect in roadway obviously, the mine antenna should radiate the Gaussian beam with a flat shape with the average of 蟺 / 2;The width of the half-power lobe of the antenna is at least narrower than that of the ideal point source radiation field at the boundary point of the IHII propagating zone in the roadway.
【作者單位】： 中國礦業(yè)大學(xué)物聯(lián)網(wǎng)(感知礦山)研究中心礦山互聯(lián)網(wǎng)應(yīng)用技術(shù)國家地方聯(lián)合工程實(shí)驗(yàn)室;中國礦業(yè)大學(xué)信息與控制工程學(xué)院;中國礦業(yè)大學(xué)計(jì)算機(jī)科學(xué)與技術(shù)學(xué)院;
【基金】：國家自然科學(xué)基金面上資助項(xiàng)目(61471361) 江蘇省自然科學(xué)基金資助項(xiàng)目(BK20160264)
【分類號】：TD65

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1 劉曉明;煤礦巷道移動微波輸能關(guān)鍵技術(shù)研究[D];中國礦業(yè)大學(xué);2017年

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本文編號：1701533