Echo scintillation Index affected by cat-eye target's caliber with Cassegrain lens

Cong-miao Shan; Hua-yan Sun; Yan-zhong Zhao; Yong-hui Zheng

doi:10.1117/12.2199661

15 October 2015 Echo scintillation Index affected by cat-eye target's caliber with Cassegrain lens

Cong-miao Shan, Hua-yan Sun, Yan-zhong Zhao, Yong-hui Zheng

Proceedings Volume 9674, AOPC 2015: Optical and Optoelectronic Sensing and Imaging Technology; 96741R (2015) https://doi.org/10.1117/12.2199661
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

The optical aperture of cat-eye target has the aperture averaging effect to the active detecting laser of active laser detection system, which can be used to identify optical targets. The echo scintillation characteristics of the transmission-type lens target have been studied in previous work. Discussing the differences of the echo scintillation characteristics between the transmission-type lens target and Cassegrain lens target can be helpful to targets classified. In this paper, the echo scintillation characteristics of Cat-eye target’s caliber with Cassegrain lens has been discussed . By using the flashing theory of spherical wave in the weak atmospheric turbulence, the annular aperture filter function and the Kolmogorov power spectrum, the analytic expression of the scintillation index of the cat-eye target echo of the horizontal path two-way transmission was given when the light is normal incidence. Then the impact of turbulence inner and outer scale 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. Echo scintillation index shows the tendency of decreasing with the target aperture increases and different ratios of the inner and outer aperture diameter show the different echo scintillation index curves. This conclusion has a certain significance for target recognition in the active laser detection system that can largely determine the target type by largely determining the scope of the cat-eye target which depending on echo scintillation index.

Citation Download Citation

Cong-miao Shan, Hua-yan Sun, Yan-zhong Zhao, and Yong-hui Zheng "Echo scintillation Index affected by cat-eye target's caliber with Cassegrain lens", Proc. SPIE 9674, AOPC 2015: Optical and Optoelectronic Sensing and Imaging Technology, 96741R (15 October 2015); https://doi.org/10.1117/12.2199661

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KEYWORDS

Scintillation

Target detection

Turbulence

Target recognition

Atmospheric turbulence

Laser systems engineering

Active optics

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