This paper mainly uses the modified Tatarskii spectrum to calculate the beam wander expressions that only consider the outer scale. The expressions that consider both the outer scale and the inner scale under strong turbulence. After that, this paper analyses the influence and the reason of the inner scale under different turbulence intensities. The result shows that the influence of inner scale on beam wander is basically in the range of millimeters. When under strong fluctuation conditions, the influence of inner scale is about several hundred microns. Therefore, in terms of instrument detection, the actual situation and the required accuracy are used to select the corresponding model.
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