With Maxwell equations and electron fluid equations Gaussian,damped sinusoidal broadband high-power microwave(HPM) propagation in air is analyzed by using finite difference time domain(FDTD) method.At each time grid,according to electronic velocity of narrow-band pulse,effective electric field of broadband pulse is solved with discrete Fourier transform(DFT) method.Ionization parameters at each spatial grid are updated by substituting effective electric field and pressure into corresponding formulas.Calculation accuracy is improved.It shows that broadband HPM pulse amplitude,pulse width,height above sea level have significant effect on air breakdown.Tail loss is resulted from air breakdown.As propagation distance increases,HPM pulse tail decay increases and spectrum of pulse is broadened,splited,and center frequency shifts.

A Eulerian code MEPH2Y is combined with a Lagrangian code LTZ-2D to analyze perforation of jet and projectile on a concrete plate. The hybrid code advantages in calculation the formation of jet and projectile. High resolution on penetration and damage of concrete target are obtained. Jet penetration and damage of the concrete target are simulated and compared with experimental results. Jet penetration and damage of concrete target simulated agree well with test data.