光学学报, 2014, 34 (2): 0201003, 网络出版: 2014-01-21
大气湍流中目标尺寸对回波闪烁残余指数影响的数值研究
Numerical Research on Effect of the Size of the Target in Turbulence on the Residual Scintillation Index
大气光学 残余闪烁指数 广义惠更斯菲涅耳原理 孔径平滑效应 atmospheric optics residual scintillation index extended Huygens-Fresnel principle aperture averaging effect
摘要
综合利用了Rytov方法和广义惠更斯菲涅耳原理推导了水平及斜程路径上粗糙目标回波残余闪烁指数的表达式，并利用数值方法计算了不同波长球面波及平面波入射情况下的残余闪烁指数，其结果与分步傅里叶算法模拟的结果相吻合，证明了该理论的正确性。分析了残余闪烁指数与目标直径、传播距离的关系，证明了残余闪烁指数等于被目标孔径平滑了的入射波闪烁指数。
Abstract
Expression of the residual scintillation index of a received intensity from a rough target in atmospheric turbulence is derived by using the extended Huygens-Fresnel principle combined with the Rytov method. The formula is numerically evaluated in the cases of spherical wave and plane wave incidences, and the results agree with those obtained by the slip-step Fourier method, which proves the validity of the theory. The relationship between the residual scintillation index with the target size and the propagation distance is analyzed, which proves that the residual scintillation index is the scintillation index on the target plane averaged by the target aperture.
王利国, 吴振森, 王明军. 大气湍流中目标尺寸对回波闪烁残余指数影响的数值研究[J]. 光学学报, 2014, 34(2): 0201003. Wang Liguo, Wu Zhensen, Wang Mingjun. Numerical Research on Effect of the Size of the Target in Turbulence on the Residual Scintillation Index[J]. Acta Optica Sinica, 2014, 34(2): 0201003.
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