等离子体涂覆导弹的电磁散射特性分析

研究了涂覆导弹的隐身特性,分析了等离子参数选取对隐身特性的影响。利用媒质参数〖AKε～D〗(ω)的Debye方程与时域场量间的关系式,将移位算子法应用到色散媒质中的FDTD计算当中,对麦克斯韦方程作了修改,并给出了色散媒质中与频率有关的FDTD表达式。通过仿真并与其它方法结果相比较,验证了该算法计算色散媒质散射特性的有效性,表明等离子体对减小目标RCS具有显著效果。

A Study of the Stealthy Characteristics of Missile Coated with Plasma

In this paper, the stealth characteristics of the coated missile are studied. Through analyzing the relationship between Debye equation of and filed variable in time-domain, the shifting operator is applied to deriving the formulas of finite-difference time domain for dispersive medium, and the Maxwell''s equations are modified to make the FDTD expression independent of the dispersive medium. The frequency-dependent expressions of FDTD in the dispersive medium are given. The comparison of the simulating results of this method to the results of literatures shows that the method adopted in this paper is effective in calculating the scattering characteristics of dispersive medium and that plasma plays a distinct role in decreasing RCS. The simulation results of missile coated with plasma are given. The effect of parameters selecting on stealthy characteristics is analyzed.