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将发动机进气道等效为波导结构模型，分析了进气道中喷气发动机旋转叶片对雷达回波的调制效应，这种调制效应可用目标ＲＣＳ的变化规律及调制谱表示。实践表明，喷气发动机的Ｊ．Ｅ．Ｍ效应，尽管对飞机机身散射的有用信号是个大的干扰，但调制谱对目标识别是十分有用的。
The inlet of the engine is equivalent to a waveguide structure model, and the modulation effect of the rotating blades of the jet engine on the radar echo in the intake port is analyzed. The modulation effect can be expressed by the variation rule of the target RCS and the modulation spectrum. Practice shows that the jet engine J. E. M effect, although useful signals scattered by aircraft fuselages are a major disturbance, the modulation spectrum is very useful for target recognition.