Average intensity and signal-to-noise ratio from a fully diffuse target in atmospheric turbulence
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摘要: 基于广义惠更斯-菲涅尔原理，根据Rytov相位结构函数的二次近似，推导了湍流大气中漫射目标探测器表面的平均强度和信噪比的解析表达式。给出不同类型尺寸的漫射目标散射波经湍流大气传输在探测器表面的平均强度和信噪比，数值分析了不同目标尺寸、湍流强度、透镜大小对探测器表面平均强度和信噪比的影响。目标尺寸和透镜尺寸越大，信噪比越大；相反地，湍流越大，信噪比越小。Abstract: Based on the Huygens-Fresnel integral and Rytov’s phase structure function, we formulated the average intensity and signal-to-noise ratio of a direction-detection imaging system in turbulent media. This paper presents the average intensity and signal-to-noise ratio (SNR) of diffused target scattering wave through turbulent atmosphere. The analytical expressions show the dependence of the average intensity and SNR on imaging lens, the turbulence strength and the object size. If the target size and lens size increase, or turbulent atmosphere decreases, signal-to-noise will increase.
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Key words:
- turbulent atmosphere /
- diffuse target /
- average intensity /
- signal-to-noise ratio
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图 2 平均强度与湍流强度的关系
Figure 2. Relationship between average intensity and turbulence refractive index structure constaut
$C_n^2 $ -
[1] Fried D L. Optical resolution through a randomly inhomogeneous medium for very long and very short exposures[J]. J Opt Soc Am, 1966, 56: 1372-1379. doi: 10.1364/JOSA.56.001372 [2] Ishimaru A. Limitation on image resolution imposed by a random medium[J]. Applied Optics, 1978, 17: 348-352. doi: 10.1364/AO.17.000348 [3] Mahajan V N, Lum B K. Imaging through atmospheric turbulence with annular pupils[J]. Applied optics, 1981, 20: 3233-3237. doi: 10.1364/AO.20.003233 [4] Yura H T. Signal-to-noise ratio of heterodyne lidar systems in the presence of atmospheric turbulence[J]. Optica Acta International Journal of Optics, 1979, 26: 627-644. [5] Shapiro J H, Capron B A, Harney R C. Imaging and target detection with a heterodyne-reception optical radar[J]. Applied optics, 1981, 20: 3292-3313. doi: 10.1364/AO.20.003292 [6] Wang S J, Plonus M A. Imaging through turbulence: Degradation of signal-to-noise ratio[J]. Optics Communications, 1984, 50: 73-78. doi: 10.1016/0030-4018(84)90139-1 [7] Elsebelgy B, Plonus M, Yang C C. Double-passage imaging of an object behind a random medium[J]. J Opt Soc Am, 1995, 12: 307-313. doi: 10.1364/JOSAA.12.000307 [8] Loktev L, Svyatoslav S, Gleb V. Speckle imaging through turbulent atmosphere based on adaptable pupil segmentation[J]. Optics Letters, 2011, 36: 2656-2658. doi: 10.1364/OL.36.002656 [9] Gal R, Kiryati N. Progress in the restoration of image sequences degraded by atmospheric turbulence[J]. Pattern Recognition Letters, 2014, 48: 8-14. doi: 10.1016/j.patrec.2014.04.007 [10] Douglas A, Jefferies M, Stuart M, et al. High-resolution speckle imaging through strong atmospheric turbulence[J]. Optics Express, 2016, 24(11): 12116-12129. doi: 10.1364/OE.24.012116 [11] Plemmons R J, Prasad S, Zhang Qiang. Deblurring compressive spectro-polarimetric images taken trough atmospheric turbulence[J]. Applied Optics, 2014, 6(86): 13-17. [12] Cui L Y, Cao X G, Zhou F G. Influence of moderate-to-strong non-Kolmogorov turbulence on the imaging system by atmospheric turbulence MTF[J]. Optik, 2015, 126: 191-198. doi: 10.1016/j.ijleo.2014.08.147 [13] Plonus M A, Ouyang C F, Wang S H. Intensity properties of partially coherent beam waves[J]. Applied Optics, 1980, 19: 3082-3085. doi: 10.1364/AO.19.003082 [14] Plonus M A, Wang S J. Quadratic structure functions and scintillation[J]. Applied Optics, 1985, 24: 570-571. doi: 10.1364/AO.24.000570 -
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