飞机发动机旋转叶片的散射谱特征

飞机发动机旋转叶片引起的周期性运动部件调制(PMPM)影响目标多普勒频率跟踪精度，同时也为目标识别提供了重要特征信息。该文基于旋转叶片组电磁散射计算模型和实验测量数据，重点分析了PMPM频谱包络调制现象的形成原因。结果表明：与叶片倾斜角一样，扭角也是影响PMPM频谱分布的重要因素。

Scattering Spectrum Signature of Rotating Blades for Aircraft Engine

The moving parts of an aircraft, such as rotor blades, propeller blades, and jet engine compressor and turbine blades, cause a periodic modulation on the radar return signals. Though this periodic modulation can sometimes effect the Doppler tracking of the target, it can also provide important information for target identification as a radar signature. The phenomenon of the spectrum envelope modulation is analyzed in terms of electromagnetic scattering computation and experimental results of rotating blades. The results show that the blade twist is one of the important factor that impacting the spectrum distribution.