Analysis Of NEMP Aperture Coupling And Protcetion

Informationization has become one of the main characteristics in modern warfare; a large number of electronic equipments can not be separated from modern military system. One of the biggest threaten to electronic equipments is high-intensity electromagnetic pulse radiation. The appearance of high-attitude nuclear explosions and E-bombs makes the requirements of the capability against the nuclear electromagnetic pulse(NEMP) attack of electro-weapon and the C4I system(command, communication, control, computer and information system)command-control system higher. In that way, the technology and theory research of NEMP and the protection method become more and more important in the main countries around the world.In this paper, the NEMP environment is described in detail, including its damaging effects, coupling simulation, shielding effectiveness testing and protecting. Firstly, the time domain parameters and spectrum of most NEMP standards are compared; NEMP coupling approach is discussed and the coupling model is established, conclusion are gained through Finite-Difference Time-Domain(FDTD) method. Secondly, shielding effectiveness is analyzed both in time domain and frequency domain, and the waveform of NEMP after shielding is recovered through transfer function of minimum phase, which set up an approach to estimate shielding effectiveness of time domain through shielding effectiveness of frequency domain. Thirdly, the normal shielding materials are discussed, and the testing method of the shielding effectiveness is introduced, several common shielding materials are tested as well. Finally, according to the simulation analysis and the measurement of shielding materials above, the actual protective measures are given.