| 动态桨叶RCS特性的实验研究 |
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| 引用本文： | 蒙志君,吕明云,武哲.动态桨叶RCS特性的实验研究[J].北京航空航天大学学报,2006,32(9):1003-1006. |
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| 作者姓名： | 蒙志君 吕明云 武哲 |
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| 作者单位： | 北京航空航天大学 航空科学与工程学院, 北京 100083 |
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| 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(Radar 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.
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| 关 键 词： | 动态桨叶 雷达散射截面(RCS) RCS频谱 |
| 文章编号： | 1001-5965(2006)09-1003-04 |
| 收稿时间： | 2005-11-30 |
| 修稿时间： | 2005年11月30日 |
Experimental investigation on RCS characteristics of rotating blades |
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| Meng Zhijun,Lü Mingyun,Wu Zhe.Experimental investigation on RCS characteristics of rotating blades[J].Journal of Beijing University of Aeronautics and Astronautics,2006,32(9):1003-1006. |
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| Authors: | Meng Zhijun Lü Mingyun Wu Zhe |
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| Institution: | School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China |
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| Abstract: | 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. |
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| Keywords: | rotating blades radar cross section(RCS) RCS spectrum |
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