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考虑到光束通过大气时受到大气湍流的影响,理论上分析了到达角起伏的原因,通过利用马尔科夫和平均强度的平方近似所求得到达角起伏公式,采用变形谱 Von Karman 所得出的波结构函数 D(ρ,z),得出到达角起伏在考虑湍流内外尺度和强度影响下的到达角方差表达式.并在垂程方向上分析得出到达角方差随 L 增大而增大,在小于250 m 范围内,仅考虑湍流强度与考虑了湍流尺度和强度的影响相比,两者较接近,大于250 m 以后,考虑了湍流尺度和强度的影响比仅考虑湍流强度影响的大.
Considering the influence of turbulence caused by the atmospheric turbulence when the light beam passes through the atmosphere, the reason of the arrival angle fluctuation is theoretically analyzed. By using the square wave approximation of the Markov average intensity, the wave obtained by the Von Karman deformation spectrum And the structure function D (ρ, z), the angular variation of arrival angle under the influence of turbulence internal and external scale and strength is obtained, and the variance of arrival angle increases with the increase of L in the vertical direction, In the range of less than 250 m, considering both the turbulence intensity and the turbulence intensity and the turbulence intensity, the turbulence intensity and turbulence intensity are considered to be larger than 250 m.