發(fā)布時(shí)間：2018-07-10 01:17

  本文選題：太陽(yáng)射電爆發(fā) + 無(wú)線通信　； 參考：《云南大學(xué)》2016年博士論文

【摘要】：太陽(yáng)劇烈活動(dòng)特別是耀斑爆發(fā)、日冕物質(zhì)拋射等對(duì)地球及其所處的日地空間環(huán)境將造成嚴(yán)重的影響,而太陽(yáng)爆發(fā)在微波波段的強(qiáng)烈噪聲對(duì)空間電磁場(chǎng)的影響同樣存在。在以往多起太陽(yáng)射電爆發(fā)期間,GPS地面站均發(fā)生了導(dǎo)航信號(hào)失鎖、可見(jiàn)星數(shù)大幅下降等情況,證明太陽(yáng)射電爆發(fā)產(chǎn)生的噪聲信號(hào)的確是導(dǎo)航信號(hào)的影響因素之一。目前對(duì)相關(guān)的預(yù)警方案尚未有研究,同時(shí)也沒(méi)有專(zhuān)門(mén)針對(duì)此類(lèi)事件的預(yù)警設(shè)備。論文的主要工作及創(chuàng)新點(diǎn)如下●計(jì)算了太陽(yáng)射電爆發(fā)對(duì)無(wú)線傳輸信號(hào)可能影響程度,確定了影響不同頻段信號(hào)的閾值,其中L波段(1GHz-2GHz)的衛(wèi)星通信信號(hào)最容易受到影響——爆發(fā)期間L波段寬頻段內(nèi)產(chǎn)生的白噪聲會(huì)引起信道的不穩(wěn)定,其影響與系統(tǒng)工作頻率f的平方成反比,與天線的增益G成正比,同時(shí)太陽(yáng)爆發(fā)信號(hào)從天線的主波束入射到天線影響將最大,遠(yuǎn)離主波束影響將減小�！窀鶕�(jù)目前的空間天氣監(jiān)測(cè)手段和數(shù)據(jù),提出了利用日面光學(xué)觀測(cè)圖像+太陽(yáng)射電2800MHz進(jìn)行早期預(yù)報(bào)的辦法。針對(duì)目前的空間天氣監(jiān)測(cè)數(shù)據(jù)不能滿(mǎn)足快速現(xiàn)報(bào)要求的現(xiàn)實(shí),提出了在L波段建立多點(diǎn)頻實(shí)時(shí)流量監(jiān)測(cè)接收機(jī)系統(tǒng)方案,該系統(tǒng)基于云南天文臺(tái)L波段太陽(yáng)射電望遠(yuǎn)鏡,能快速反應(yīng)當(dāng)前太陽(yáng)射電流量異常情況,并有效的發(fā)出預(yù)警信號(hào)�！裢瑫r(shí)提出并設(shè)計(jì)了L波段太陽(yáng)射電流量精密監(jiān)測(cè)系統(tǒng)在L波段內(nèi)對(duì)八個(gè)5MHz帶寬內(nèi)太陽(yáng)流量實(shí)時(shí)監(jiān)測(cè),最小靈敏度為1S.F.U(太陽(yáng)射電流量單位),可以快速的對(duì)L波段內(nèi)太陽(yáng)射電流量進(jìn)行定標(biāo)和觀測(cè),準(zhǔn)確地反應(yīng)太陽(yáng)射電流量的變化,配合光學(xué)觀測(cè)、2800MHz太陽(yáng)射電觀測(cè)數(shù)據(jù),可以形成長(zhǎng)、中、短期預(yù)報(bào)模式,提供有效的預(yù)警、預(yù)報(bào)信息�！褡詈筇岢霾捎幂o助天線+地面站天線方式,建立主動(dòng)自適應(yīng)濾波器,根據(jù)太陽(yáng)射電爆發(fā)模型設(shè)計(jì)該濾波器的阻帶寬度大約在45'左右,衰減量在40dB以上。
[Abstract]:Intense solar activity, especially flares, and coronal mass ejections will have a serious impact on the Earth and its solar-terrestrial space environment, and the strong noise of the solar burst in the microwave band will also have an effect on the space electromagnetic field. In the past many solar radio bursts occurred during the GPS earth station navigation signal unlocked and the number of visible stars decreased significantly proving that the solar radio burst produced by the noise signal is indeed one of the factors affecting the navigation signal. No research has been done on the relevant early warning programs, nor are there any warning devices specifically designed for such incidents. The main work and innovation of this paper are as follows: the possible influence degree of solar radio burst on wireless transmission signal is calculated, and the threshold value affecting different frequency band signal is determined. Among them, the L band (1GHz ~ 2GHz) satellite communication signal is most vulnerable to the influence-the white noise generated in the L band broadband band during the burst will cause the channel instability, which is inversely proportional to the square of the operating frequency f of the system. It is proportional to the antenna gain G, and the influence of solar burst signal from the main beam of the antenna to the antenna will be maximum, and the influence from far away from the main beam will be reduced. According to the current space weather monitoring means and data, A method for early prediction of solar radio at 2800MHz using sun-plane optical observation images is presented. In view of the fact that the current space weather monitoring data can not meet the requirement of rapid reporting, a multi-point frequency real-time flow monitoring receiver system in L band is proposed. The system is based on the L-band solar radio telescope of Yunnan Observatory. It can quickly respond to the current solar radio flux anomalies and send out early warning signals effectively. At the same time, a precise monitoring system for the L band solar radio flux is proposed and designed to monitor the solar flux in 8 5 MHz bandwidth in L band in real time. The minimum sensitivity is 1S.F.U (solar radio flux unit), which can quickly calibrate and observe the solar radio flux in L band, and accurately reflect the variation of solar radio flux. Medium and short term forecasting models provide effective early warning and forecast information. Finally, an active adaptive filter is established by means of auxiliary antenna earth station antenna. According to the solar radio burst model, the stopband width of the filter is about 45 'and the attenuation is more than 40 dB.
【學(xué)位授予單位】：云南大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TN914;TN972

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