Fast RCS calculation technique for targets coated with multi-layer RAM
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摘要: 提出一种用于计算表面涂覆多层雷达吸波材料目标雷达散射截面(RCS,Radar Cross Section)的快速算法.对于拟合成面元和棱边的多层涂覆目标,应用物理光学法及阻抗边界条件计算多层涂覆面元的RCS,并将物理绕射理论与等效电磁流法结合,用于计算多层涂覆棱边的RCS.在计算中,预先计算出目标不同涂覆表面反射系数矩阵,有效地提高了计算的速度和效率.应用上述方法计算表面涂覆单层及多层涂覆材料的平板和典型旋转体的RCS,通过与文献给定结果的对比,验证了该算法的有效性.对多层涂覆复杂目标RCS的仿真计算结果,进一步表明了该方法的准确性以及在提高计算速度方面的效果.Abstract: A fast radar cross section (RCS) calculation technique for targets coated with multi-layer radar absorbing materials (RAM)was presented. The targets were modeled as a combination of facets and wedges. Physical optics (PO) method and impedance boundary condition (IBC) were used for RCS calculation of coated facets. Physical theory of diffraction (PTD) combined with method of equivalent edge current (MEC) was applied for the scattering computation of coated wedges. During the RCS calculation, matrices of reflecting coefficient were pre-calculated and stored. This greatly improves the speed of scattering calculation. RCS of single-layer and multi-layer coated plates and typical revolving solids were calculated, demonstrating that results have good agreement with those in reference. Further results of complex target show the validity of this method in improving accuracy and computing speed.
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