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基于修正Rytov理论,导出了适应于强湍流起伏区的光束漂移方差表达式,分析了湍流外尺度、有效散射区域尺度和光束束腰对光束漂移的影响,并与实验结果进行了比较。结果表明,相对于基于指数模型的光束漂移方差表达式,基于修正Rytov理论给出的表达式的计算结果能更好地与实验结果吻合。当光束束腰大于有效散射区域尺度时,不发生饱和效应,导出的表达式与传统理论给出的表达式一致;当光束束腰小于有效散射区域尺度时,光束漂移的幅度不随Rytov方差的增大而明显变化。
Based on the modified Rytov theory, the expression of variance of beam drift adapted to strong turbulence region is deduced. The influence of turbulent outer scale, effective scattering region scale and beam waist on beam drift is analyzed and compared with experimental results. The results show that the calculated results based on the modified Rytov theory are in good agreement with the experimental results, as compared with the exponential model-based beam drift variance expression. When the beam waist is larger than the effective scattering region scale, the saturation effect does not occur. The expression is consistent with the traditional theory. When the beam waist is smaller than the effective scattering region scale, the magnitude of beam drift does not increase with the Rytov variance Big and noticeable changes.