具有隐身结构飞机短波散射截面

HF Scattering Cross section of the Stealth Warplane

对微波雷达具有隐身作用的飞机，其形体较为复杂且表面涂敷有强吸波材料。在对一种具有隐身几何外形结构实际尺寸飞机进行计算建模的基础上，文中采用ＦＤＴＤ技术得到了两种极化状态下该飞机无涂敷时不同方向上的短波雷达截面（ＲＣＳ）值。其结果显示了这种隐身几何外形飞机在短波波段有明显的频率谐振特性、极化特性和较大的ＲＣＳ（１０～３０ｄＢｍ２），可为天波超视距雷达在选择工作频率时提供理论参考，并定量地说明天波超视距雷达具有较优的反隐身目标能力。

The stealth warplane for the microwave radar usually have complicated structures with the coating of wave absorption. On the base of calculation and modeling of the geometrical structure of the warplane in real size, the HF RCS of the air crafts under two different polarizations in different direction have been calculated with the FDTD. The result shows that the above mentioned stealth warplane have the obvious characterstics of frequency resonance, polarization and the relatively large RCS in HF Band (10-30dBm 2), which can be used as the theoretical reference for selection of working frequency for sky wave OTH Radar and it also means that the sky wave OTH radar has good capability of anti stealth targets quantitatively.