进气道是飞行器头部方向3大强散射源之一,目前国际上工程实用的算法主要以射线法为主,射线法在解决大长径比、大S弯进气道时误差较大,难以满足工程中进气道隐身方案设计的需求。文中选用精度较高的迭代物理光学法,采用快速多极子方法对面元之间的相互影响进行加速,辅以基于MPI的并行技术,在32节点计算平台上模拟了真实进气道尺寸大小的腔体X波段的RCS,计算结果和模式法结果吻合良好,验证了该方法具有真实进气道X波段RCS预估能力。 The air intake is one of the three strong scattering sources in the direction of the head of the aircraft. At present, the practical and practical algorithms in the world mainly focus on the ray method. The ray method has a large error in solving the large aspect ratio, Difficult to meet the project intake port stealth program design needs. In this paper, Iteration physics optics with high accuracy is used to speed up the interaction between elements by using the fast multipole method. Simultaneously with MPI-based parallel technique, the real inlet size is simulated on a 32-node computing platform The results of X-band cavity RCS are in good agreement with the results of the model method, which proves that this method has the real inlet X-ray RCS prediction ability.