Research on optical target identification based on echo scintillation effect

Shan Congmiao; Sun Huayan; Zhao Yanzhong

doi:10.3788/IRLA201847.0326002

In order to obtain more characteristic information of optical targets and achieve the goal of target recognition, the scintillation of target echo was considered as one of the means of target recognition by utilizing the difference of modulation characteristics of different target echoes in turbulent atmosphere. The random phase screen was used to generate round trip atmospheric turbulence by power spectrum inversion, using hard edged apertures to expand into finite series sum forms and Collins diffraction integral formula, the complex amplitude distribution of the reflected light of corner reflector, lens and reflector of Lambertian diffuse target was derived. The influence of turbulence intensity and target size on the scintillation index of the three target echoes was analyzed and verified by experiments. The results show that the scintillation index of optical target and diffuse reflection echo have obvious differences, the overall difference is an order of magnitude. With the increase of diameter, optical target echo scintillation index shows a decreasing trend on the whole; The scintillation index of corner reflector and lens target echoes in the numerical difference is not obvious, but the method of plotting the echo scintillation index over time by multiple test results can be used to distinguish the two roughly. This method can quickly identify the optical target from the diffuse background, and also provide a reference value for the classification and recognition of the optical object.

Research on optical target identification based on echo scintillation effect

1. Equipment Academy,Beijing 101416,China

Received Date: 2017-10-10

Rev Recd Date: 2017-11-20

Publish Date: 2018-03-25

Key words:

Abstract: In order to obtain more characteristic information of optical targets and achieve the goal of target recognition, the scintillation of target echo was considered as one of the means of target recognition by utilizing the difference of modulation characteristics of different target echoes in turbulent atmosphere. The random phase screen was used to generate round trip atmospheric turbulence by power spectrum inversion, using hard edged apertures to expand into finite series sum forms and Collins diffraction integral formula, the complex amplitude distribution of the reflected light of corner reflector, lens and reflector of Lambertian diffuse target was derived. The influence of turbulence intensity and target size on the scintillation index of the three target echoes was analyzed and verified by experiments. The results show that the scintillation index of optical target and diffuse reflection echo have obvious differences, the overall difference is an order of magnitude. With the increase of diameter, optical target echo scintillation index shows a decreasing trend on the whole; The scintillation index of corner reflector and lens target echoes in the numerical difference is not obvious, but the method of plotting the echo scintillation index over time by multiple test results can be used to distinguish the two roughly. This method can quickly identify the optical target from the diffuse background, and also provide a reference value for the classification and recognition of the optical object.

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Reference (18)

[1]	Zhang Wentao, Zhu Baohua. Reseach on the laser beam through turbulence atmosphere channel[J]. Journal of University of Electronic Science and Technology of China, 2007, 36(4):784-787. (in Chinese)
[2]	Yuan Zongheng, Zhang Wentao. The analysis and research for the laser beam through onflow atmosphere channel[J]. Laser Infrared, 2006, 36(4):272-274. (in Chinese)
[3]	Zhang Hui, Wang Yongtian. Scattering characteristics and targets recognition of laser TDD[J]. Acta Photonica Sinica, 2005, 34(1):22-24. (in Chinese)
[4]	Dai Yang, Lin Zhaoxiang, Zhang Wenyan, et al. Method of atmospheric turbulence measurement by lidar[J]. High Power Laser and Particle Beams, 2006, 18(11):1769-1773. (in Chinese)
[5]	Ma Yuan, Ji Xiaoling. Average intensity of tilted and off-axis Gaussian Schell-model beams propagating through a cat-eye optical lens in atmospheric[J]. Acta Phys Sin, 2013, 62(9):094214. (in Chinese)
[6]	Cai Yangjian, Lin Q, Eyyuboglu H T, et al. Generalized tensor ABCD law for an elliptical Gaussian beam passing through an astigmatic optical system in turbulent atmosphere[J]. Applied Physics B, 2009, 94:319-325.
[7]	Andrews L C. An analytical model for the refractive index power spectrum and its application to optical scintillations in the atmosphere[J]. J Mod Opt, 1992, 39(9):1849-1853.
[8]	Andrews L C, Phillops R L, Hopen C Y. Laser Beam Scintillation with Applications[M]. Washington:SPIE Press, 2001.
[9]	Wang Jing, Zhang Yu, Lv Pin. Simulation method of non-ideal light source in laser system[J]. Infrared and Laser Engineering, 2014, 43(11):3527-3532. (in Chinese)
[10]	Wang Qitao, Tong Shoufeng, Xu Youhui. On simulation and verification of the atmospheric turbulent phase screen with Zernike polynomials[J]. Infrared and Laser Engineering, 2013, 42(7):1907-1911. (in Chinese)
[11]	Han Yong, Wu Jian, Yang Chunping, et al. Propagation studying in cat-eye system for the beam affected by atmospheric turbulence[C]//SPIE, 2007, 6795:679520.
[12]	Ricardo Barrios, Federico Dios, Jaume Recolons, et al. Aperture averaging in a laser Gaussian beam:simulations and experiments[C]//SPIE, 2010, 7814:78140C-1-8.
[13]	Flatte S M. Calculations of wave propagation through statistical random media, with and without a waveguide[J]. Optics Express, 2002, 10(6):777-804.
[14]	Wheelon A D. Electromagnetic Scintillation I. Geometrical Optics[M]. Cambridge:Cambridge University Press, 2001.
[15]	Feng Youjun, Zhang Rongzhu, Zhang Bin. Propagation properties of the beam generated by Gaussian mirror resonator passing through a paraxial ABCD optical system[J]. Opt Laser Technol, 2010, 2(4):662-668.
[16]	Chen Senhui, Zhang Tingrong, Feng Xiaofang. Propagation properties of cosh-squared-Gaussian beam through fractional Fourier transform systems[J]. Opt Commun, 2009, 282(6):1083-1087.
[17]	Hou Honglu, Chen Jie, Li Ningniao, et al. Study on airborne corner reflector for airborne target tracking[J]. Optical Instruments, 2011, 33(6):77-81. (in Chinese)
[18]	Zook J D. A simple model for diffuse reflection[J]. Opt Commun, 1976, 17(1):77-82.

Research on optical target identification based on echo scintillation effect

doi: 10.3788/IRLA201847.0326002

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