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本文将发动机进气道等效为波导结构模型,分析了波导中旋转叶片对 TE 雷达回波的调制效应,这种调制效应可用目标 RCS 的变化规律及其调制谱来表示。实验表明,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,但其调制谱对于目标识别却是十分有用的。
In this paper, the inlet of the engine is equivalent to a waveguide structure model, and the modulation effect of the rotating blades on the TE radar echo in the waveguide is analyzed. The modulation effect can be expressed by the variation rule of the target RCS and its modulation spectrum. Experiments show that the jet engine J.E.M effect, although the useful signal scattered by the aircraft fuselage is a big interference, but the modulation spectrum for the target identification is very useful.