摘要
在微波暗室中测量了金属平板桨叶动态模型的高频雷达散射截面RCS(Ra-dar Cross Section),并通过快速傅立叶变换FFT(Fast Fourier Transform)得到相应的频谱图;详细分析了时域和频域RCS随桨叶片数、雷达波入射方向、入射频率、极化状态和桨叶转速等因素的变化.实验结果表明主要特征是时域RCS呈周期性起伏,频谱图因前行桨叶与后行桨叶散射有差别而不对称,且频谱宽度反映了多普勒效应.取得的结果与已有文献的计算分析一致,对直升机的探测和识别具有重要的参考价值.
The high frequency backscattering by rotating skew-plated metal blades was investigated experimentally. RCS （radar cross section） was measured in an anechoic chamber. The RCS spectra, relating to Doppler effect, was obtained by FFT（ fast Fourier transform） from time-domain signature. The effects on RCS characteristics of blade number, angle of incidence, frequency, polarization, and rotating velocity were also analyzed. The main characteristics are the periodic fluctuating of time-domain RCS and the asymmetric of RCS spectrum. The latter is due to the difference between the scattering by advancing blades and retreating blades. The results agree well with the computational analysis of previous literatures, and may do some help in helicopter detection and identification.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2006年第9期1003-1006,共4页
Journal of Beijing University of Aeronautics and Astronautics
