Response Analysis Of Vehicular Cables To High-Altitude Nuclear Electromagnetic Pulse

In modern information warfare,all kinds of high-tech weapons are playing a more important role than ever before,especially information weapons.The electromagnetic compatibility of special vehicles is becoming more and more important because of the influence of complex electromagnetic environment on the battlefield.As a typical strong interference source constituting the electromagnetic environment,aer is a kind of rf pulse with high intensity,short action time and wide frequency range,which can enter the vehicle through a variety of coupling ways and threaten the work efficiency of on-board electronic equipment.The topic of this dissertation comes from "Research on Simulation Technology of Vehicle Strong Electromagnetic Pulse Interference Protection" national defense pre-research fund project.In this dissertation,the transmission line equation is taken as the theoretical basis.Electromagnetic simulation software CST based on FIT algorithm is used to establish the electromagnetic model of the vehicle and shield,and to establish the cables system in the vehicle simulating the real situation,based on the transmission line theory.The main research contents are as follows: First,conducting research on radiation from a single cable and crosstalk current from two lines.The simulation results show that the coaxial line with shield layer has lower electric field intensity than the one without shield layer.Coxial line has lower crosstalk current and has better ability to prevent electromagnetic leakage.Second,conducting research on High altitude nuclear electromagnetic pulse response current.The simulation results show that shielded cable has lower response current cable than the cable without shielding layer.The closer the cable is to the ground,the less electromagnetic energy enters the cable thus inspiring lower response current.For a cable with an outer conductor,the response current is inversely proportional to the thickness of the outer conductor.The maximum response current is generated when electric field is parallel to the direction of cable.When the pulse incidence direction is perpendicular to the plane of the cable,maximum response current will be inspired.Third,conducting research on the irradiation response of the high altitude nuclear electromagnetic pulse at different positions of the ideal cavity and the vehicle,the simulation results show that shielding effect is better with smaller hole linear size and thicker cavity.The shielding effect of hole array is better than that of single hole.The electric field intensity at the rear of the car is the highest,and it is higher when the side irradiation is on the car than the top irradiation.Forth,conducting research on high altitude nuclear electromagnetic pulse response of cables in special vehicles,the simulation results show that the response current of the cable at the rear of the vehicle is the maximum,the response current of the cables parallel to the direction of electric field polarization is larger,and the response current of the cables with shielding layer is smaller.