本文選題：LED顯示系統(tǒng) + 信息泄漏�。� 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：近年來(lái),隨著信息技術(shù)和計(jì)算機(jī)技術(shù)的不斷發(fā)展,LED大屏幕因其優(yōu)良的顯示性能而得到了廣泛關(guān)注,已被應(yīng)用于越來(lái)越多的場(chǎng)合。但此系統(tǒng)高速的工作頻率,脈沖大電流驅(qū)動(dòng),數(shù)量極大的導(dǎo)線、接插件和高頻開關(guān)電源,外殼因顯示而無(wú)法完全屏蔽等諸多因素,都使得LED大屏幕顯示系統(tǒng)的電磁輻射相當(dāng)嚴(yán)重,不可避免地存在視頻信息泄漏的風(fēng)險(xiǎn)。對(duì)LED大屏幕顯示系統(tǒng)的視頻信息進(jìn)行電磁泄漏檢測(cè)與防護(hù)技術(shù)研究,是我們所面臨的新課題。本文以基于FPGA控制和以太網(wǎng)傳輸?shù)腖ED顯示系統(tǒng)為研究對(duì)象,在了解其組成結(jié)構(gòu)與工作原理的基礎(chǔ)上,根據(jù)研究的方向性與必要性對(duì)整個(gè)系統(tǒng)進(jìn)行了模塊劃分,并對(duì)各模塊潛在的視頻信息泄漏源進(jìn)行了初步定位。之后,對(duì)LED視頻源、LED發(fā)送/接收系統(tǒng)以及LED掃描驅(qū)動(dòng)系統(tǒng)三個(gè)模塊的功能特性、工作原理、信號(hào)處理過(guò)程及線纜傳輸方式等展開了細(xì)致的理論研究,建立信號(hào)模型并仿真得到直觀的時(shí)、頻域特征。最后結(jié)合各潛在泄漏部位的實(shí)際測(cè)試結(jié)果,驗(yàn)證了建模方法的正確性,也分析判斷出各關(guān)鍵電路是否存在視頻信息泄漏問(wèn)題,得到相關(guān)結(jié)論。電磁能量的傳輸方式有輻射性耦合和傳導(dǎo)性耦合兩種。前述的分析及結(jié)論都為該系統(tǒng)的電磁泄漏抑制方法研究提供了理論基礎(chǔ)。對(duì)于主機(jī)、控制器、LED屏體等設(shè)備存在的輻射性耦合,可采用基于完善的屏蔽技術(shù)的工程加固方案。包括設(shè)備的電源線、USB控制線和各模塊間不同的視頻傳輸線纜在內(nèi),線上的傳導(dǎo)耦合對(duì)信息泄漏的判斷有很大影響,也可能作為新的輻射源再次對(duì)信息安全構(gòu)成威脅。抑制傳導(dǎo)干擾最為有效的手段則是EMI濾波器。文章對(duì)EMI濾波器的傳輸網(wǎng)絡(luò)、關(guān)鍵參數(shù)及設(shè)計(jì)方法進(jìn)行了分析與探討,最終設(shè)計(jì)并制作了EMI電源濾波器,通過(guò)仿真與測(cè)試對(duì)其性能做出綜合評(píng)估,論證了此抑制器件的可行性與有效性,具有很好的工程應(yīng)用價(jià)值。
[Abstract]:In recent years, with the continuous development of information technology and computer technology, LED large screen has been widely concerned because of its excellent display performance, and has been used in more and more occasions. However, the system has many factors, such as high working frequency, high pulse current drive, a large number of wires, connectors and high frequency switching power supply, and the shell can not be completely shielded because of display, etc. The electromagnetic radiation of LED large screen display system is very serious, which inevitably leads to the risk of video information leakage. It is a new task for us to study electromagnetic leakage detection and protection technology for video information of LED large screen display system. In this paper, the LED display system based on FPGA control and Ethernet transmission is taken as the research object. On the basis of understanding its composition and working principle, the whole system is divided into modules according to the direction and necessity of the research. At the same time, the potential video information leakage source of each module is preliminarily located. After that, the function characteristics, working principle, signal processing process and cable transmission mode of LED video source LED sending / receiving system and LED scanning drive system are studied in detail. The signal model is established and the visual time and frequency domain features are obtained by simulation. Finally, the correctness of the modeling method is verified by combining the actual test results of the potential leakage sites, and the problem of video information leakage in every key circuit is analyzed and judged, and the relevant conclusions are obtained. There are two modes of electromagnetic energy transmission: radiative coupling and conductive coupling. The above analysis and conclusions provide a theoretical basis for the study of electromagnetic leakage suppression method of the system. For the main engine, the radiation coupling of the LED screen and other devices can be adopted based on the perfect shielding technology. Including the USB control line of the equipment and the different video transmission cable among the modules, the conduction coupling on the line has a great influence on the judgment of information leakage, and may pose a threat to the information security again as a new emitter. EMI filter is the most effective method to suppress conduction interference. In this paper, the transmission network, key parameters and design methods of EMI filter are analyzed and discussed. Finally, the EMI power filter is designed and manufactured, and its performance is evaluated by simulation and test. The feasibility and effectiveness of the device are demonstrated, and it has good engineering application value.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN873

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本文編號(hào)：2002003