Abstract:

In view of the computer electromagnetic information leakage of information security implication,this paper analyses the time-frequency characteristics of radiation signal from LCD display with a resolution of 1 280×1 024 through simulation.The design and measurement of the shielding box is given.A USA military standard testing is made,which shows that the designed electronic shielding box is less than the overall emission of radiation 35 dBμV/m,and with a proper increase in protection radius,the amount of its radiation emission can be reduced to 20 dBμV/m or less,lower than the 20 dBμV/m of the ambient noise thus meeting the information security requirements.

Key words: radiation signal time-frequency analysis;shielding box design;electromagnetic compatibility testing