With the continuous development and enhancement of anti-stealth technology, fighters will be increasingly threatened by joint detection of radar and infrared detectors. To improve the overall stealth performance of the aircraft's intake and exhaust systems, a mixed design approach (MDA) is presented to reduce the aircraft's radar cross-section (RCS) and suppress infrared signature. Full factorial design method is used to establish the aircraft model, taking into account the influencing factors of the air intake model, nozzle stages, exhaust port form, lower baffle, center baffle, lateral baffle and nozzle opening width. The physical optics and physical theory of diffraction are used to solve the electromagnetic scattering characteristics of the target, and the Monte Carlo and ray tracing method are used to solve the infrared radiation signature of the system. After comprehensive evaluation and selection of MDA, the RCS mean index and tail RCS index of the optimized aircraft model have been effectively reduced, and the infrared radiation index has also been greatly improved. MDA is effective and efficient in terms of radar/infrared integrated stealth design for the intake and exhaust systems of advanced fighters.

随着反隐身技术的不断发展和增强，战斗机将越来越受到雷达和红外探测器联合探测的威胁。为了提高飞机进气和排气系统的总体隐身性能，提出了一种混合设计方法（MDA）以减小飞机的雷达横截面（RCS）并抑制红外信号。考虑到进气模型，喷嘴级，排气口形式，下挡板，中心挡板，侧挡板和喷嘴开口宽度的影响因素，使用全因子设计方法来建立飞机模型。物理光学和衍射的物理理论被用来解决目标的电磁散射特性，用蒙特卡洛和射线追踪法解决了系统的红外辐射特征。通过对MDA的综合评估和选择，有效降低了优化后飞机模型的RCS平均指数和尾部RCS指数，极大地提高了红外辐射指数。MDA在先进战斗机的进气和排气系统的雷达/红外集成隐身设计方面非常有效。