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论证了散射体几何形状对感应电流的影响规律,并基于飞行器几何外形特征和矩量法,提出了一种用于飞行器雷达散射截面(RCS)计算的高精度快速算法。指出根据散射体几何形状可以预知强的电流耦合区域分布,并提取了用以识别这些强电流耦合的两个几何参数,即物面曲率和场、源点间距。利用这些强电流耦合能够构造稀疏化的阻抗矩阵,从而实现RCS的快速求解。以带缝锥球体、双弧柱和典型隐身飞机外形的电磁散射计算为例,验证了所提算法的效率和可行性。数值结果表明:(1)与矩量法相比,考虑了场源点间距影响的新算法保持了令人满意的计算精度,而计算时间仅是矩量法的8%。(2)在考虑电距离影响的基础上,继续考虑物面曲率影响可以进一步减少约9.5%的计算时间。
The influence law of the geometry of the scatterer on the induced current is demonstrated. Based on the geometric shape of the aircraft and the method of moment, a fast and accurate algorithm for the RCS calculation of the aircraft is proposed. It is pointed out that the distribution of strong current-coupled regions can be predicted based on the geometry of scatterers, and two geometrical parameters to identify these strong current couplings are extracted, namely the curvature of the object surface and the distance between the source and the source. The use of these strong current coupling can construct a thinning of the impedance matrix, in order to achieve fast RCS solution. Taking the calculation of the electromagnetic scattering of the shape of slotted cone, double arc column and typical stealth aircraft as an example, the efficiency and feasibility of the proposed algorithm are verified. The numerical results show that: (1) Compared with the moment method, the new algorithm, which considers the effect of field source spacing, maintains a satisfactory calculation accuracy, and the calculation time is only 8% of the moment method. (2) Considering the influence of electrical distance, further considering the effect of curvature of object surface can further reduce the computation time by about 9.5%.