The research on video signal electromagnetic radiation of computer based on near-field testing data

Computer circuits are very complex and there are various signals in them. A computer can radiate electromagnetic waves when working. Some of these radiations may result in computer information leakage. A video signal electromagnetic radiation model is set up based on near zone testing data, and the far zone video electromagnetic radiation is estimated using computational electromagnetics. Furthermore, it is proposed to investigate noise in the propagation path using the FDTD method, and the noise is modeled as a stochastic process rather than determined variables. Thus, the time-variant characteristic of noise in the propagation path is studied. Then, electromagnetic radiation with 16 dB degrees is simulated. Lastly, the recovered word images are given, after the video electromagnetic information leakage is processed through synchronization, correlated filtering, phase locking, recognition and reconstruction technology, etc. The characteristics of information leakage are studied and discussed.