中国物理B ›› 2007, Vol. 16 ›› Issue (5): 1327-1333.doi: 10.1088/1009-1963/16/5/027

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Angle-of-arrival fluctuations in moderate to strong turbulence

马晶, 高宠, 谭立英   

  1. National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2006-06-18 修回日期:2006-11-27 出版日期:2007-05-20 发布日期:2007-05-20

Angle-of-arrival fluctuations in moderate to strong turbulence

Ma Jing(马晶), Gao Chong(高宠)† , and Tan Li-Ying(谭立英)   

  1. National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China
  • Received:2006-06-18 Revised:2006-11-27 Online:2007-05-20 Published:2007-05-20

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摘要： Based on the modified spectrum, the analytic expressions for the variance and normalized covariance of angle-of-arrival (AOA) fluctuations are presented, which are applicable to the weak and strong regimes. The experimental data of AOA fluctuations validate the new derived expressions in weak and strong regimes. The results show that the receiving aperture D, outer scale and cell scale larger than the scattering disc S contribute significantly to the AOA fluctuations, and contributions from the small-scale turbulence are negligible. For the case of 4S/D\ll 1, the receiving aperture dominates low-pass filtering effects and the new displacement variances are in good agreement with the results from the old weak-fluctuation theory. For the case of 4S/D\gg 1, the scattering disc dominates the low-pass filtering effects and the new displacement variances depart from the results from the old weak-fluctuation theory.

关键词: atmospheric optics, optical wave propagation, angle-of-arrival fluctuations, moderate to strong turbulence

Abstract: Based on the modified spectrum, the analytic expressions for the variance and normalized covariance of angle-of-arrival (AOA) fluctuations are presented, which are applicable to the weak and strong regimes. The experimental data of AOA fluctuations validate the new derived expressions in weak and strong regimes. The results show that the receiving aperture D, outer scale and cell scale larger than the scattering disc S contribute significantly to the AOA fluctuations, and contributions from the small-scale turbulence are negligible. For the case of $4S/D\ll 1$, the receiving aperture dominates low-pass filtering effects and the new displacement variances are in good agreement with the results from the old weak-fluctuation theory. For the case of $4S/D\gg 1$, the scattering disc dominates the low-pass filtering effects and the new displacement variances depart from the results from the old weak-fluctuation theory.

Key words: atmospheric optics, optical wave propagation, angle-of-arrival fluctuations, moderate to strong turbulence

中图分类号:  (Atmospheric turbulence effects)

  • 42.68.Bz
42.25.Dd (Wave propagation in random media) 42.68.Ay (Propagation, transmission, attenuation, and radiative transfer)