Statistical method for atmospheric optical turbulence parameters

Abstract

The invention discloses a statistical method for atmospheric optical turbulence parameters. The method comprises the following steps that elevation angle values of the sun before and after the sun passes through the top are distinguished through solar azimuth marks, when the solar azimuth ranges from 0 degree to 180 degrees, atmospheric optical turbulence parameters are data of the upper half day,and when the solar azimuth ranges from 180 degrees to 360 degrees, the atmospheric optical turbulence parameters are data of the lower half day; the value of the pitch angle greater than 0 degree andthe maximum value of the pitch angle is normalized, and the value of the pitch angle less than 0 degree and the minimum value of the pitch angle is normalized; a statistical analysis rule of the atmospheric optical turbulence parameter along with the normalized solar pitch angle alpha is calculated; and the normalized solar pitch angle alpha is cycled by using a trigonometric function to obtain astatistical analysis rule of the atmospheric optical turbulence parameters along with the cycled solar pitch angle alpha. The method can perform quantitative analysis on atmospheric optical turbulence parameter measurement values of different months and different places.

Description

technical field [0001] The invention relates to a statistical method, in particular to a statistical method for atmospheric optical turbulence parameters. Background technique [0002] The random variation of the refractive index caused by the random fluctuation of atmospheric temperature and atmospheric density is called atmospheric optical turbulence. When light waves propagate in turbulent atmosphere, beam phase distortion and random fluctuation of light intensity occur, which cause atmospheric turbulence effects such as beam expansion, drift and scintillation. Atmospheric coherence length r 0 and near-surface turbulence intensity (atmospheric refractive index structure constant) C n 2 It is the basic parameter to describe the effect of atmospheric turbulence. In the field of laser engineering applications such as astronomical site selection and laser atmospheric communication, the statistical characteristics of atmospheric turbulence parameters are of great significa...

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Problems solved by technology

[0007] 1) When measuring at the same location, the measurement data of different months (seasons) have obvious shifts with the sunrise and sunset times

[0008] 2) When measuring at different locations, due to different longitudes, there are differences in sunrise and sunset times, resulting in significant offsets in the measurement data

[0009] Due to the above shortcomings, when analyzing and comparing the measured data of atmospheric optical turbulence parameters, qualitative descriptions such as sunrise time, sunset time, conversion time, daytime, and nighttime are often used, and then the measured values ​​of atmospheric optical turbulence parameters in different months and locations cannot be analyzed. perform quantitative analysis

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