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为分析旋翼及其主要部件的微多普勒效应特点,提出了一种通过微波暗室进行旋翼微多普勒效应测试的实验方法,并通过实例验证了实验方法的可靠性;两种桨叶不同桨叶片数的系列实验结果表明,旋翼的微多普勒特性通过频率把各个散射部件的回波能量分开,旋翼的片数和转速不影响微多普勒特性的分析估算,旋翼的微多普勒特性仅与其运动特性相关;结合直升机目标识别特征,采用短时傅里叶变换方法对实验数据进行微多普勒效应提取,分析了微多普勒效应与入射波和旋翼几何属性之间的关系,得到了旋翼微多普勒效应的频率特性、极化特性和宽频带特性.
In order to analyze the characteristics of micro-Doppler effect of rotor and its main components, an experimental method for micro-Doppler effect testing of rotor through microwave anechoic chamber was proposed. The reliability of the experimental method was verified by an example. The experimental results of a series of paddle blades show that the micro-Doppler characteristic of the rotor separates the echo energy of each scattering component by frequency. The number and speed of rotor blades do not affect the analysis and estimation of micro-Doppler characteristics. The micro- Lehmannian correlation is only related to the motion characteristics of the helicopter. Combining the characteristics of the helicopter target recognition, the experimental data are extracted by the micro-Doppler effect using the short-time Fourier transform method. The relationship between the micro-Doppler effect and the geometrical properties of the incident wave and the rotor Relationship, get the rotor micro-Doppler effect frequency characteristics, polarization characteristics and broadband characteristics.