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Optical heterodyne detection is one of the key techniques for developing synthetic aperture ladar. The decoherence effect caused by the roughness of the target surface is particularly important for the practical use of the synthetic aperture ladar. The effect of the target surface roughness on the echo signal detection is discussed in the paper. One-dimensional and two-dimensional Gaussian random rough surface model are created by the use of the Monte Carlo method. The detection process of the target echo signal is simulated to study the effect of the target surface roughness on the intermediate frequency signal. And two optical heterodyne detection experiments are conducted in which the targets each include a rough surface and a smooth surface to verify the serious decoherence effect of the target roughness on the synthetic aperture laser radar echo signal. Meanwhile, the wavefronts of both the local oscillator and the signal beam are monitored at the position of the detector with a digital wavefront analyzer. The measured phase distribution accords well with the simulation result. It is shown that the phase of the echo signal from a rough surface has a serious distortion. The results obtained could be useful for designing the parameters of the laser source and the receiver, as well as for estimating the detection range of the ladar system.
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Keywords:
- synthetic aperture ladar /
- decoherence /
- rough surface /
- Monte Carlo method
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[14] Zhao T Y, Liu Q X, Yu F H 2012 Acta Phys. Sin. 61 074207 (in Chinese) [赵廷玉, 刘钦晓, 余飞鸿 2012 物理学报 61 074207]
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[1] Li Y H, Wu Z S, Gong Y J, Zhang G, Wang M J 2010 Acta Phys. Sin. 59 6988 (in Chinese) [李艳辉, 吴振森, 宫彦军, 张耿, 王明军 2010 物理学报 59 6988]
[2] Beck S M, Buck J R, Buell W F 2005 Appl. Opt. 44 7621
[3] Buell W F, Marecal N J 2005 SPIE 22 661
[4] Bell W, Marechal N, Buck J 2005 SPIE 5791 152
[5] Li Z J, Wu J, Liu G G, Zhu B Q 2010 Acta Optica Sinica 30 994 (in Chinese) [李增局, 吴谨, 刘国国, 朱炳祺 2010 光学学报 30 994]
[6] Guo L, Xing M D, Zhang L, Tang Y, Bao Z 2009 Sci. China E 52 1678 (in Chinese) [郭亮, 邢孟道, 张龙, 唐禹, 保铮 2009 中国科学E辑 52 1678]
[7] Dai P J, Liu G G, Wu J 2010 Acta Optica Sinica 30 739 (in Chinese) [戴品娟, 刘国国, 吴谨 2010 光学学报 30 739]
[8] Li F, Wu S Y, Zheng Y C, Yang H G 2006 Infrared and Laser Engineering 35 56 (in Chinese) [李番, 邬双阳, 郑永超, 杨红果 2006 红外与激光工程 35 56]
[9] Chen Y B, Tang B, Wang L N, Zhang M D, Chinese J 2006 Radio Science 21 975 (in Chinese) [陈云波, 唐波, 王丽娜, 张明东 2006 电波科学学报 21 975]
[10] Hua Z L, Li H P 2009 Acta Optica Sinica 29 1149 (in Chinese) [华志励, 李洪平 2009 光学学报 29 1149]
[11] Lai Z, Zeng X D, Feng Z J, Cao C Q 2011 Optics and Precision Engineering 19 1531 (in Chinese) [来志, 曾晓东, 冯喆君, 曹长庆 2011 光学精密工程 19 1531]
[12] Li Y C, Wang C H, Gao L, Cong H F, Qu Y 2012 Acta Phys. Sin. 61 044207 (in Chinese ) [李彦超, 王春晖, 高龙, 丛海芳, 曲杨 2012 物理学报 61 044207]
[13] Luo Q, Huang L H, Gu N T, Li W, Rao C H 2012 Acta Phys. Sin. 61 069501 (in Chinese) [罗群, 黄林海, 顾乃婷, 李雯, 饶长辉 2012 物理学报 61 069501]
[14] Zhao T Y, Liu Q X, Yu F H 2012 Acta Phys. Sin. 61 074207 (in Chinese) [赵廷玉, 刘钦晓, 余飞鸿 2012 物理学报 61 074207]
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