阴极射线管(CRT)显示器信息电磁泄漏频谱分析方法

Method of Analysis on Spectrum of Information Electromagnetic Leakage from Cathode Ray Tube (CRT) Displays

CRT显示器偏转系统和电子束的电磁辐射会导致信息泄漏。本文提出一种分析CRT显示器信息电磁泄漏频域特性的方法 :从信息攻击所处的场点出发 ,先将产生辐射的电流变换到场点时域波形 ,然后利用Welch平均周期图法分析辐射信号的功率谱密度。文章同时给出了更精确的模型近似电子束电流 。

Electromagnetic radiation of the current through deflection coils involves synchronization signals and that of electron beam involves video signals. Research on spectrum of information electromagnetic leakage form CRT displays is of great importance. In this paper a new method is put forward to study the spectrum of electromagnetic radiation from CRT displays. Signal in time domain at field point of radiating current, rather than the current itself, is analyzed with Welch average periodogram algorithm to evaluate the power spectrum density. Accurate current model of the electron beam is presented at the same time. Agreement between the computed results and measured results demonstrated that this analysis method is correct and effective.