通过单台阶、三台阶的实测与计算结果对比,证明开发的MLFMA(Multilevel Fast Multipole Algo-rithm)程序可应用于表面台阶的电磁分析。采用该算法深入研究了单台阶、三台阶电磁散射与入射频率的变化关系。结果表明,频率的增加可引起单台阶电磁散射的增强,表现为雷达散射截面算术均值增加,单台阶的散射曲线具有一定的弱对称性;而三台阶除具有以上特性外,还表现为相互耦合性、曲线振荡增强、次波峰向内偏移、峰值增大。理论分析证明了上述结果的正确性,可以用来提高飞行器的隐身性能。
Taking into account the limitations of existing stealth performance analysis methods, a method termed as the integrated stealth performance analysis method is proposed for evaluating the stealth ability of the penetration aircraft. Based on various target radar cross section （RCS） scattering characters, this article integrates the relevant parameters needed for building up target circumferential RCS scattering model and proposes the RCS scattering controlling parameters to control the changing trends of the relevant model RCS scattering characters. According to the radar dynamic detecting characters during the whole penetration course, a dynamic stealth performance evaluating model is proposed accompanied by a series of stealth ability estimation rules. This new analysis method can enhance the integrality and dependability of the stealth analysis conclusions and summarize the relationship between the target RCS scattering characters and their effects on stealth performance. The rules indicated by this relationship can be used as the reference for designing new type of stealth aircraft and setting up specific penetration tactics.
