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�������պ����ѧѧ�� 2006, Vol. 32 Issue (09) :1003-1006    DOI:
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Experimental investigation on RCS characteristics of rotating blades
Meng Zhijun, Wu Zhe*
School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ��΢�������в����˽���ƽ�彰Ҷ��̬ģ�͵ĸ�Ƶ�״�ɢ�����RCS(Radar Cross Section),��ͨ�����ٸ���Ҷ�任FFT(Fast Fourier Transform)�õ���Ӧ��Ƶ��ͼ;��ϸ������ʱ���Ƶ��RCS�潰ҶƬ�����״ﲨ���䷽������Ƶ�ʡ�����״̬�ͽ�Ҷת�ٵ����صı仯.ʵ����������Ҫ������ʱ��RCS�����������,Ƶ��ͼ��ǰ�н�Ҷ����н�Ҷɢ���в������Գ�,��Ƶ�׿�ȷ�ӳ�˶�����ЧӦ.ȡ�õĽ�����������׵ļ������һ��,��ֱ������̽���ʶ�������Ҫ�IJο���ֵ.
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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.
Keywords�� rotating blades   radar cross section (RCS)   RCS spectrum     
Received 2005-11-30;
About author: ��־��(1982-),��,����������,��ʿ��,amengzj@ase.buaa.edu.cn.
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��־��, ������, ����.��̬��ҶRCS���Ե�ʵ���о�[J]  �������պ����ѧѧ��, 2006,V32(09): 1003-1006
Meng Zhijun, Wu Zhe.Experimental investigation on RCS characteristics of rotating blades[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(09): 1003-1006
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2006/V32/I09/1003
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