Echo scintillation index affected by cat-eye target's caliber in FSO communication

Cong-miao Shan; Hua-yan Sun; Lai-xian Zhang

doi:10.1117/12.2033008

21 August 2013 Echo scintillation index affected by cat-eye target's caliber in FSO communication

Cong-miao Shan, Hua-yan Sun, Lai-xian Zhang

Proceedings Volume 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems; 89060Y (2013) https://doi.org/10.1117/12.2033008
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

Cat-eye effect has been widely used in active laser detection, optical target identification and free space optical (FSO) communication, but atmospheric turbulence makes laser beam fluctuate, which limits the use of cat-eye effect. The optical aperture has the aperture averaging effect to the detecting laser, which can be used to identify optical targets. Using the flashing theory of spherical wave in the weak atmospheric turbulence, the circular aperture filter function and the Kolmogorov power spectrum, the analytic expression of the echo scintillation index of the cat-eye target of the horizontal path two-way transmission was given in which the cat-eye target were equivalent to a combination of two circular apertures and the detector of cat-eye target was equivalent to a reflecting plane with the reflectivity η when the light is normal incidence. Then the impact of turbulence inner and outer scales to the echo scintillation index and the analytic expression of the echo scintillation index at the receiving aperture were presented using the modified Hill spectrum and the modified Von Karman spectrum. The simulation results show that scintillation index of considering the inner scale is larger compared with that of without considering the inner and outer scales and considering the inner and outer scales. Echo scintillation index shows the tendency of decreasing with the target aperture increases. The echo scintillation index increases with the transmission distance increasing.

Citation Download Citation

Cong-miao Shan, Hua-yan Sun, and Lai-xian Zhang "Echo scintillation index affected by cat-eye target's caliber in FSO communication", Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 89060Y (21 August 2013); https://doi.org/10.1117/12.2033008

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