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�������պ����ѧѧ�� 2011, Vol. 37 Issue (9) :1127-1131    DOI:
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Ŀ������FMCW�����״���Ƶ�źŵ�Ӱ�����
�����, ������, ��־��, ŷ��*
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Impact analysis of targets’ surface to beat-frequency signal in FMCW laser radar
Yang Dezhao, Song Ningfang, Lin Zhili, Ou Pan*
School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ ����Ŀ�����ĴֲڶȻ�Ӱ���Ƶ������(FMCW, Frequency Modulated Continuous-Wave)��ɼ����״����Ƶ�ź�����,����Ӱ���״�IJ��ٲ�ྫ��.Ϊ������Ӱ���Ը����״������,ͨ��������Ŀ����Ŀռ���ɢ��,�����ͷ�������Ƶ�źŵij�ǿģ��,����Բ�ͬ�ֲڶȵķ������,������Monte Carloģ����漰ϵͳʵ����֤.�����ʵ��������:����Ŀ�귴�������б��������Ƶ�źŽ�������ǿ�ȵļ���˥��;�����ڸ�˹�ʹֲ���Ŀ��,ǿ����ֲ���߶ȼ������ı�ֵ�ɸ�ָ����ϵ.ʵ���������۷�����ģ�������һ��,��ϵͳ�IJ�����С��1 mm,��̬�ٶ��ȶ�������0.1 mm/s.
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Abstract�� The characteristics of beat-frequency signal and the accuracy of range and velocity measurement in frequency modulated continuous-wave (FMCW) coherent laser radar were influenced by the surface roughness of measured target. In order to estimate the impact and improve the system-s performance, the scattering surface was spatially discretized into many patches, and the electric field intensity model was built and analyzed. Monte Carlo simulations and system experiments were carried out for the cases with different roughness surfaces. The results indicate that the alternating component of beat-frequency signal will decrease dramatically with the tilt of mirror plane, and when the surface is Gaussian roughness plane, it has a negative exponential relationship with the ratio of the surface-roughness height to the square of light wavelength. The experimental results are consistent with the theoretical analysis and numerical simulation results, and the system-s range-measurement error is less than 1mm, the static velocity stability is better than 0.1mm/s.
Keywords�� coherent laser radar   frequency modulated continuous-wave(FMCW)   signal analysis   surface roughness     
Received 2010-09-07;
Fund:

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About author: �����(1981-),��,ɽ���Ͳ���,��ʿ��,yangdezhao1234@163.com.
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�����, ������, ��־��, ŷ��.Ŀ������FMCW�����״���Ƶ�źŵ�Ӱ�����[J]  �������պ����ѧѧ��, 2011,V37(9): 1127-1131
Yang Dezhao, Song Ningfang, Lin Zhili, Ou Pan.Impact analysis of targets’ surface to beat-frequency signal in FMCW laser radar[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(9): 1127-1131
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