Electromagnetic Environmental Effects Analysis Modeling

With the constant progress of science and technology, the development ofelectromagnetic pulse weapons and the constantly upgraded of communication systemand electronic system, widen the frequency band range of artificial electromagnetic, andintensity is also more and more big, which makes the electromagnetic environmentbecome more and more complicated. Nuclear electromagnetic pulse coming fromnuclear explosions which is a kind of artificial electromagnetic pulse and its damage ishuge. It can make all kinds of communications, electronic and electrical system with noperfect protection produce great destructive power, and even make it completelyparalyzed. Therefore, the research of nuclear electromagnetic pulse coupling is a hottopic of research of electromagnetic environmental effects. Based on this, this paperstudied the nuclear electromagnetic pulse coupling rule of cable and apertures.In the problem of nuclear electromagnetic pulse with cable transmission linecoupling is solved by using transmission line theory. Paper adopts the Agrawalcalculation model, establishes cable transmission line equivalent model, uses distributedsource equivalent for induction voltage and induction current of incident wave on thetransmission line cable, obtains the expressions of the induced current and voltage ofthe cable terminal. Through numerical calculation, and using the Matlab simulationsoftware, the induction current is obtained in different height, length, and differenttransmission line cable radius, field at different incident angle of incident and under thecondition of the different dielectric constant and different conductivity. On this basis,discussed and summarized the coupling rule of nuclear electromagnetic pulse on atransmission line cable.On the coupling research of nuclear electromagnetic pulse and apertures, paperadopts the electromagnetic topology method to analyze the problem. On the basis ofelectromagnetic topology theory, apertures coupling electromagnetic topological modelis established, and the electromagnetic interaction is analyzed. Then the BLT equation isdeduced, and BLT equation is used to solve the coupling problem. As a result of theneed of calculation, paper studies the hole of equivalent dipole sources, analysis of the characteristics of the holes of the far field and near field, obtains the expression ofequivalent field. Finally, using numerical calculation and Matlab simulation software,the induced voltage is obtained in different aperture radius, different distance fromtransmission lines to aperture, paper discussed and summarized the law of nuclearelectromagnetic pulse coupling of apertures. Finally for the purpose of analyzing theprotective measures of aperture electromagnetic, illustrates the use of the XFDTD inthis respect.