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为精确高效计算多极子模式数(MMN),提出了3个控制因子,详细研究了控制因子对多层快速多极子算法(MLFMA)的积分采样点数和计算精度的影响;基于控制因子,提出一种改进措施,可在保证精度的前提下,显著提高计算效率、有效降低内存。对3种飞行器,采用改进的MLFMA,分析了多频散射特性,发现飞行器外形在不同频率区域均可影响雷达散射截面(RCS)。研究了外形隐身布局和考虑隐身的常规布局的RCS多频减缩规律,结果表明,外形隐身在谐振区和高频区具有较大的RCS减缩效果,在瑞利区仍具有较弱影响;与吸波相比,外形隐身可产生较广的多频RCS减缩。以上结果可用于飞行器在多频段或全频段的隐身设计。
In order to calculate MMN accurately and efficiently, three control factors are proposed, and the effects of control factors on the integral sampling points and calculation accuracy of MLFMA are studied in detail. Based on the control factor, An improvement measure is proposed, which can significantly improve the computational efficiency and reduce the memory effectively while ensuring the accuracy. For the three types of aircraft, the improved MLFMA is used to analyze the multi-frequency scattering characteristics. It is found that the aircraft profile can affect the radar cross section (RCS) in different frequency regions. The RCS multifrequency reduction law of profile stealth layout and conventional layout considering stealth has been studied. The results show that the shape stealth has larger RCS reduction effect in the resonance and high frequency regions, and still has a weaker effect in the Rayleigh zone. Compared to waves, the shape stealth can produce a wide range of multi-frequency RCS reduction. The above results can be used for stealth design of multi-band or full-range aircraft.