Abstract: Aiming at the typical problems of electromagnetic pulse influencing wires of the spacecraft, the spacecraft field/wire coupling analysis model was built. To calculate the electromagnetic field, the finite difference time domain method was improved. The average electrical parameters was adopted, and the object edges was modified, which cannot match the Yee grids. To analyze the field/wire coupling, the multiconductor transmission line transient reponse model based on the lumped equivalent sources was proposed. The distributed voltage and current sources excited by the incident field were decoupled with the exponential multiconductor transmission lines matrix. The lumped equivalent voltage and current sources model were built. The model was used to analyze a wire in the launch vehicle which was influenced by the electromagnetic pulse. The analysis results show that the interference of the electromagnetic pulse to the wires can destroy the equipment, even though there is shield.

Key words: Field/wirecoupling, Improvedfinitedifferencetimedomainmethod, Lumpedsourcemodel, Spacecraft