太阳射电爆发干扰通信系统评估与预警方案的研究

发布时间：2018-07-10 01:17

本文选题：太阳射电爆发 + 无线通信　；参考：《云南大学》2016年博士论文

【摘要】：太阳剧烈活动特别是耀斑爆发、日冕物质抛射等对地球及其所处的日地空间环境将造成严重的影响,而太阳爆发在微波波段的强烈噪声对空间电磁场的影响同样存在。在以往多起太阳射电爆发期间,GPS地面站均发生了导航信号失锁、可见星数大幅下降等情况,证明太阳射电爆发产生的噪声信号的确是导航信号的影响因素之一。目前对相关的预警方案尚未有研究,同时也没有专门针对此类事件的预警设备。论文的主要工作及创新点如下●计算了太阳射电爆发对无线传输信号可能影响程度,确定了影响不同频段信号的阈值,其中L波段(1GHz-2GHz)的卫星通信信号最容易受到影响——爆发期间L波段宽频段内产生的白噪声会引起信道的不稳定,其影响与系统工作频率f的平方成反比,与天线的增益G成正比,同时太阳爆发信号从天线的主波束入射到天线影响将最大,远离主波束影响将减小。●根据目前的空间天气监测手段和数据,提出了利用日面光学观测图像+太阳射电2800MHz进行早期预报的办法。针对目前的空间天气监测数据不能满足快速现报要求的现实,提出了在L波段建立多点频实时流量监测接收机系统方案,该系统基于云南天文台L波段太阳射电望远镜,能快速反应当前太阳射电流量异常情况,并有效的发出预警信号。●同时提出并设计了L波段太阳射电流量精密监测系统在L波段内对八个5MHz带宽内太阳流量实时监测,最小灵敏度为1S.F.U(太阳射电流量单位),可以快速的对L波段内太阳射电流量进行定标和观测,准确地反应太阳射电流量的变化,配合光学观测、2800MHz太阳射电观测数据,可以形成长、中、短期预报模式,提供有效的预警、预报信息。●最后提出采用辅助天线+地面站天线方式,建立主动自适应滤波器,根据太阳射电爆发模型设计该滤波器的阻带宽度大约在45'左右,衰减量在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.
【学位授予单位】：云南大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN914;TN972

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